{"id":1187,"date":"2016-01-31T19:46:52","date_gmt":"2016-01-31T11:46:52","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=1187"},"modified":"2016-08-23T16:16:06","modified_gmt":"2016-08-23T08:16:06","slug":"%e6%9c%80%e8%bf%915%e5%b9%b4133%e4%b8%aajava%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98%e5%88%97%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=1187","title":{"rendered":"\u6700\u8fd15\u5e74133\u4e2aJava\u9762\u8bd5\u95ee\u9898\u5217\u8868"},"content":{"rendered":"

Java \u9762\u8bd5\u968f\u7740\u65f6\u95f4\u7684\u6539\u53d8\u800c\u6539\u53d8\u3002\u5728\u8fc7\u53bb\u7684\u65e5\u5b50\u91cc\uff0c\u5f53\u4f60\u77e5\u9053 String \u548c StringBuilder \u7684\u533a\u522b\u5c31\u80fd\u8ba9\u4f60\u76f4\u63a5\u8fdb\u5165\u7b2c\u4e8c\u8f6e\u9762\u8bd5\uff0c\u4f46\u662f\u73b0\u5728\u95ee\u9898\u53d8\u5f97\u8d8a\u6765\u8d8a\u9ad8\u7ea7\uff0c\u9762\u8bd5\u5b98\u95ee\u7684\u95ee\u9898\u4e5f\u66f4\u6df1\u5165\u3002 \u5728\u6211\u521d\u5165\u804c\u573a\u7684\u65f6\u5019\uff0c\u7c7b\u4f3c\u4e8e Vector \u4e0e Array \u7684\u533a\u522b\u3001HashMap \u4e0e Hashtable \u7684\u533a\u522b\u662f\u6700\u6d41\u884c\u7684\u95ee\u9898\uff0c\u53ea\u9700\u8981\u8bb0\u4f4f\u5b83\u4eec\uff0c\u5c31\u80fd\u5728\u9762\u8bd5\u4e2d\u83b7\u5f97\u66f4\u597d\u7684\u673a\u4f1a\uff0c\u4f46\u8fd9\u79cd\u60c5\u5f62\u5df2\u7ecf\u4e0d\u590d\u5b58\u5728\u3002\u5982\u4eca\uff0c\u4f60\u5c06\u4f1a\u88ab\u95ee\u5230\u8bb8\u591a Java \u7a0b\u5e8f\u5458\u90fd\u6ca1\u6709\u770b\u8fc7\u7684\u9886\u57df\uff0c\u5982 NIO\uff0c\u8bbe\u8ba1\u6a21\u5f0f<\/a><\/span>\uff0c\u6210\u719f\u7684\u5355\u5143\u6d4b\u8bd5\uff0c\u6216\u8005\u90a3\u4e9b\u5f88\u96be\u638c\u63e1\u7684\u77e5\u8bc6\uff0c\u5982\u5e76\u53d1\u3001\u7b97\u6cd5\u3001\u6570\u636e\u7ed3\u6784\u53ca\u7f16\u7801\u3002<\/p>\n

\u7531\u4e8e\u6211\u559c\u6b22\u7814\u7a76\u9762\u8bd5\u9898\uff0c\u56e0\u6b64\u6211\u5df2\u7ecf\u6536\u96c6\u4e86\u8bb8\u591a\u7684\u9762\u8bd5\u95ee\u9898\uff0c\u5305\u62ec\u8bb8\u591a\u8bb8\u591a\u4e0d\u540c\u7684\u4e3b\u9898\u3002\u6211\u5df2\u7ecf\u4e3a\u8fd9\u4f17\u591a\u7684\u95ee\u9898\u51c6\u5907\u4e00\u6bb5\u65f6\u95f4\u4e86\uff0c\u73b0\u5728\u6211\u5c06\u5b83\u4eec\u5206\u4eab\u7ed9\u4f60\u4eec\u3002\u8fd9\u91cc\u9762\u4e0d\u4f46\u5305\u542b\u7ecf\u5178\u7684\u9762\u8bd5\u95ee\u9898\uff0c\u5982\u7ebf\u7a0b\u3001\u96c6\u5408\u3001equals \u548c hashcode\u3001socket\uff0c\u800c\u4e14\u8fd8\u5305\u542b\u4e86 NIO\u3001\u6570\u7ec4\u3001\u5b57\u7b26\u4e32\u3001Java 8 \u7b49\u4e3b\u9898\u3002<\/p>\n

\u8be5\u5217\u8868\u5305\u542b\u4e86\u5165\u95e8\u7ea7 Java \u7a0b\u5e8f\u5458\u548c\u591a\u5e74\u7ecf\u9a8c\u7684\u9ad8\u7ea7\u5f00\u53d1\u8005\u7684\u95ee\u9898\u3002\u65e0\u8bba\u4f60\u662f 1\u30012\u30013\u30014\u30015\u30016\u30017\u30018\u30019 \u8fd8\u662f 10 \u5e74\u7ecf\u9a8c\u7684\u5f00\u53d1\u8005\uff0c\u4f60\u90fd\u80fd\u5728\u5176\u4e2d\u627e\u5230\u4e00\u4e9b\u6709\u8da3\u7684\u95ee\u9898\u3002\u8fd9\u91cc\u5305\u542b\u4e86\u4e00\u4e9b\u8d85\u7ea7\u5bb9\u6613\u56de\u7b54\u7684\u95ee\u9898\uff0c\u540c\u65f6\u5305\u542b\u7ecf\u9a8c\u4e30\u5bcc\u7684 Java \u7a0b\u5e8f\u5458\u4e5f\u4f1a\u68d8\u624b\u7684\u95ee\u9898\u3002<\/p>\n

\u5f53\u7136\u4f60\u4eec\u4e5f\u662f\u975e\u5e38\u5e78\u8fd0\u7684\uff0c\u5f53\u4eca\u6709\u8bb8\u591a\u597d\u7684\u4e66\u6765\u5e2e\u52a9\u4f60\u51c6\u5907 Java \u9762\u8bd5\uff0c\u5176\u4e2d\u6709\u4e00\u672c\u6211\u89c9\u5f97\u7279\u522b\u6709\u7528\u548c\u6709\u8da3\u7684\u662f Markham \u7684 Java \u7a0b\u5e8f\u9762\u8bd5\u63ed\u79d8\uff08Java Programming Interview Exposed\uff09\u3002 \u8fd9\u672c\u4e66\u4f1a\u544a\u8bc9\u4f60\u4e00\u4e9b Java \u548c JEE \u9762\u8bd5\u4e2d\u6700\u91cd\u8981\u7684\u4e3b\u9898\uff0c\u5373\u4f7f\u4f60\u4e0d\u662f\u51c6\u5907 Java \u9762\u8bd5\uff0c\u4e5f\u503c\u5f97\u4e00\u8bfb\u3002<\/p>\n

\u8be5\u95ee\u9898\u5217\u8868\u7279\u522b\u957f\uff0c\u6211\u4eec\u6709\u5404\u4e2a\u5730\u65b9\u7684\u95ee\u9898\uff0c\u6240\u4ee5\uff0c\u7b54\u6848\u5fc5\u987b\u8981\u77ed\u5c0f\u3001\u7b80\u6d01\u3001\u5e72\u8106\uff0c\u4e0d\u62d6\u6ce5\u5e26\u6c34\u3002\u56e0\u6b64\uff0c\u9664\u4e86\u8fd9\u4e00\u4e2a\u6bb5\u843d\uff0c\u4f60\u53ea\u4f1a\u542c\u5230\u95ee\u9898\u4e0e\u7b54\u6848\uff0c\u518d\u65e0\u5176\u4ed6\u5185\u5bb9\uff0c\u6ca1\u6709\u53cd\u9988\uff0c\u4e5f\u6ca1\u6709\u8bc4\u4ef7\u3002\u4e3a\u6b64\uff0c\u6211\u5df2\u7ecf\u5199\u597d\u4e86\u4e00\u4e9b\u535a\u6587\uff0c\u5728\u8fd9\u4e9b\u6587\u7ae0\u4e2d\u4f60\u53ef\u4ee5\u627e\u5230\u6211\u5bf9\u67d0\u4e9b\u95ee\u9898\u7684\u89c2\u70b9\uff0c\u5982\u6211\u4e3a\u4ec0\u4e48\u559c\u6b22\u8fd9\u4e2a\u95ee\u9898\uff0c\u8fd9\u4e2a\u95ee\u9898\u7684\u6311\u6218\u662f\u4ec0\u4e48\uff1f\u671f\u671b\u4ece\u9762\u8bd5\u8005\u90a3\u83b7\u53d6\u5230\u4ec0\u4e48\u6837\u7684\u7b54\u6848\uff1f<\/p>\n

\u8fd9\u4e2a\u5217\u8868\u6709\u4e00\u70b9\u4e0d\u540c\uff0c\u6211\u9f13\u52b1\u4f60\u91c7\u7528\u7c7b\u4f3c\u7684\u65b9\u5f0f\u53bb\u5206\u4eab\u95ee\u9898\u548c\u7b54\u6848\uff0c\u8fd9\u6837\u5bb9\u6613\u6e29\u4e60\u3002\u6211\u5e0c\u671b\u8fd9\u4e2a\u5217\u8868\u5bf9\u9762\u8bd5\u5b98\u548c\u5019\u9009\u4eba\u90fd\u6709\u5f88\u597d\u7684\u7528\u5904\uff0c\u9762\u8bd5\u5b98\u53ef\u4ee5\u5bf9\u8fd9\u4e9b\u95ee\u9898\u4e0a\u505a\u4e00\u4e9b\u6539\u53d8\u4ee5\u83b7\u53d6\u65b0\u5947\u548c\u4ee4\u4eba\u60ca\u5947\u7684\u5143\u7d20\uff0c\u8fd9\u5bf9\u4e00\u6b21\u597d\u7684\u9762\u8bd5\u6765\u8bf4\u975e\u5e38\u91cd\u8981\u3002\u800c\u5019\u9009\u8005\uff0c\u53ef\u4ee5\u6269\u5c55\u548c\u6d4b\u8bd5 Java \u7a0b\u5e8f\u8bed\u8a00\u548c\u5e73\u53f0\u5173\u952e\u9886\u57df\u7684\u77e5\u8bc6\u30022015 \u5e74\uff0c\u4f1a\u66f4\u591a\u7684\u5173\u6ce8\u5e76\u53d1\u6982\u5ff5\uff0cJVM \u5185\u90e8\uff0c32 \u4f4d JVM \u548c 64 JVM\u7684\u533a\u522b\uff0c\u5355\u5143\u6d4b\u8bd5\u53ca\u6574\u6d01\u7684\u4ee3\u7801\u3002\u6211\u786e\u4fe1\uff0c\u5982\u679c\u4f60\u8bfb\u8fc7\u8fd9\u4e2a\u5e9e\u5927\u7684 Java \u9762\u8bd5\u95ee\u9898\u5217\u8868\uff0c\u65e0\u8bba\u662f\u7535\u8bdd\u9762\u8bd5\u8fd8\u662f\u9762\u5bf9\u9762\u7684\u9762\u8bd5\uff0c\u4f60\u90fd\u80fd\u6709\u5f88\u597d\u7684\u8868\u73b0\u3002<\/p>\n

Java \u9762\u8bd5\u4e2d\u7684\u91cd\u8981\u8bdd\u9898<\/h2>\n

\u9664\u4e86\u4f60\u770b\u5230\u7684\u60ca\u4eba\u7684\u95ee\u9898\u6570\u91cf\uff0c\u6211\u4e5f\u5c3d\u91cf\u4fdd\u8bc1\u8d28\u91cf\u3002\u6211\u4e0d\u6b62\u4e00\u6b21\u5206\u4eab\u5404\u4e2a\u91cd\u8981\u4e3b\u9898\u4e2d\u7684\u95ee\u9898\uff0c\u4e5f\u786e\u4fdd\u5305\u542b\u6240\u8c13\u7684\u9ad8\u7ea7\u8bdd\u9898\uff0c\u8fd9\u4e9b\u8bdd\u9898\u5f88\u591a\u7a0b\u5e8f\u5458\u4e0d\u559c\u6b22\u51c6\u5907\u6216\u8005\u76f4\u63a5\u653e\u5f03\uff0c\u56e0\u4e3a\u4ed6\u4eec\u7684\u5de5\u4f5c\u4e0d\u4f1a\u6d89\u53ca\u5230\u8fd9\u4e9b\u3002Java NIO \u548c JVM \u5e95\u5c42\u5c31\u662f\u6700\u597d\u7684\u4f8b\u5b50\u3002\u4f60\u4e5f\u53ef\u4ee5\u5c06\u8bbe\u8ba1\u6a21\u5f0f\u5212\u5206\u5230\u8fd9\u4e00\u7c7b\u4e2d\uff0c\u4f46\u662f\u8d8a\u6765\u8d8a\u591a\u6709\u7ecf\u9a8c\u7684\u7a0b\u5e8f\u5458\u4e86\u89e3 GOF \u8bbe\u8ba1\u6a21\u5f0f\u5e76\u5e94\u7528\u8fd9\u4e9b\u6a21\u5f0f\u3002\u6211\u4e5f\u5c3d\u91cf\u5728\u8fd9\u4e2a\u5217\u8868\u4e2d\u5305\u542b 2015 \u5e74\u6700\u65b0\u7684\u9762\u8bd5\u95ee\u9898\uff0c\u8fd9\u4e9b\u95ee\u9898\u53ef\u80fd\u662f\u6765\u5e74\u5173\u6ce8\u7684\u6838\u5fc3\u3002\u4e3a\u4e86\u7ed9\u4f60\u4e00\u4e2a\u5927\u81f4\u7684\u4e86\u89e3,\u4e0b\u9762\u5217\u51fa\u8fd9\u4efd Java \u9762\u8bd5\u95ee\u9898\u5217\u8868\u5305\u542b\u7684\u4e3b\u9898\uff1a<\/p>\n

\u591a\u7ebf\u7a0b\uff0c\u5e76\u53d1\u53ca\u7ebf\u7a0b\u57fa\u7840
\n\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u7684\u57fa\u672c\u539f\u5219
\n\u5783\u573e\u56de\u6536\uff08GC\uff09
\nJava \u96c6\u5408\u6846\u67b6
\n\u6570\u7ec4
\n\u5b57\u7b26\u4e32
\nGOF \u8bbe\u8ba1\u6a21\u5f0f
\nSOLID \uff08\u5355\u4e00\u529f\u80fd\u3001\u5f00\u95ed\u539f\u5219\u3001\u91cc\u6c0f\u66ff\u6362\u3001\u63a5\u53e3\u9694\u79bb<\/strong>\u4ee5\u53ca\u4f9d\u8d56\u53cd\u8f6c<\/strong>\uff09\u8bbe\u8ba1\u539f\u5219
\n\u62bd\u8c61\u7c7b\u4e0e\u63a5\u53e3
\nJava \u57fa\u7840\uff0c\u5982 equals \u548c hashcode
\n\u6cdb\u578b\u4e0e\u679a\u4e3e
\nJava IO \u4e0e NIO
\n\u5e38\u7528\u7f51\u7edc\u534f\u8bae
\nJava \u4e2d\u7684\u6570\u636e\u7ed3\u6784\u548c\u7b97\u6cd5
\n\u6b63\u5219\u8868\u8fbe\u5f0f
\nJVM \u5e95\u5c42
\nJava \u6700\u4f73\u5b9e\u8df5
\nJDBC
\nDate, Time \u4e0e Calendar
\nJava \u5904\u7406 XML
\nJUnit
\n\u7f16\u7a0b<\/p>\n

120 \u5927 Java \u9762\u8bd5\u9898<\/a><\/span>\u53ca\u7b54\u6848<\/h2>\n

\u73b0\u5728\u662f\u65f6\u5019\u7ed9\u4f60\u5c55\u793a\u6211\u8fd1 5 \u5e74\u4ece\u5404\u79cd\u9762\u8bd5\u4e2d\u6536\u96c6\u6765\u7684 120 \u4e2a\u95ee\u9898\u4e86\u3002\u6211\u786e\u5b9a\u4f60\u5728\u81ea\u5df1\u7684\u9762\u8bd5\u4e2d\u89c1\u8fc7\u5f88\u591a\u8fd9\u4e9b\u95ee\u9898\uff0c\u5f88\u591a\u95ee\u9898\u4f60\u4e5f\u80fd\u6b63\u786e\u56de\u7b54\u3002<\/p>\n

\u591a\u7ebf\u7a0b\u3001\u5e76\u53d1\u53ca\u7ebf\u7a0b\u7684\u57fa\u7840\u95ee\u9898<\/h3>\n

1\uff09Java \u4e2d\u80fd\u521b\u5efa volatile \u6570\u7ec4\u5417\uff1f
\n\u80fd\uff0cJava \u4e2d\u53ef\u4ee5\u521b\u5efa volatile \u7c7b\u578b\u6570\u7ec4\uff0c\u4e0d\u8fc7\u53ea\u662f\u4e00\u4e2a\u6307\u5411\u6570\u7ec4\u7684\u5f15\u7528\uff0c\u800c\u4e0d\u662f\u6574\u4e2a\u6570\u7ec4\u3002\u6211\u7684\u610f\u601d\u662f\uff0c\u5982\u679c\u6539\u53d8\u5f15\u7528\u6307\u5411\u7684\u6570\u7ec4\uff0c\u5c06\u4f1a\u53d7\u5230 volatile \u7684\u4fdd\u62a4\uff0c\u4f46\u662f\u5982\u679c\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6539\u53d8\u6570\u7ec4\u7684\u5143\u7d20\uff0cvolatile \u6807\u793a\u7b26\u5c31\u4e0d\u80fd\u8d77\u5230\u4e4b\u524d\u7684\u4fdd\u62a4\u4f5c\u7528\u4e86\u3002<\/p>\n

2\uff09volatile \u80fd\u4f7f\u5f97\u4e00\u4e2a\u975e\u539f\u5b50\u64cd\u4f5c\u53d8\u6210\u539f\u5b50\u64cd\u4f5c\u5417\uff1f
\n\u4e00\u4e2a\u5178\u578b\u7684\u4f8b\u5b50\u662f\u5728\u7c7b\u4e2d\u6709\u4e00\u4e2a long \u7c7b\u578b\u7684\u6210\u5458\u53d8\u91cf\u3002\u5982\u679c\u4f60\u77e5\u9053\u8be5\u6210\u5458\u53d8\u91cf\u4f1a\u88ab\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\uff0c\u5982\u8ba1\u6570\u5668\u3001\u4ef7\u683c\u7b49\uff0c\u4f60\u6700\u597d\u662f\u5c06\u5176\u8bbe\u7f6e\u4e3a volatile\u3002\u4e3a\u4ec0\u4e48\uff1f\u56e0\u4e3a Java \u4e2d\u8bfb\u53d6 long \u7c7b\u578b\u53d8\u91cf\u4e0d\u662f\u539f\u5b50\u7684\uff0c\u9700\u8981\u5206\u6210\u4e24\u6b65\uff0c\u5982\u679c\u4e00\u4e2a\u7ebf\u7a0b\u6b63\u5728\u4fee\u6539\u8be5 long \u53d8\u91cf\u7684\u503c\uff0c\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u80fd\u53ea\u80fd\u770b\u5230\u8be5\u503c\u7684\u4e00\u534a\uff08\u524d 32 \u4f4d\uff09\u3002\u4f46\u662f\u5bf9\u4e00\u4e2a volatile \u578b\u7684 long \u6216 double \u53d8\u91cf\u7684\u8bfb\u5199\u662f\u539f\u5b50\u3002<\/p>\n

3\uff09volatile \u4fee\u9970\u7b26\u7684\u6709\u8fc7\u4ec0\u4e48\u5b9e\u8df5\uff1f
\n\u4e00\u79cd\u5b9e\u8df5\u662f\u7528 volatile \u4fee\u9970 long \u548c double \u53d8\u91cf\uff0c\u4f7f\u5176\u80fd\u6309\u539f\u5b50\u7c7b\u578b\u6765\u8bfb\u5199\u3002double \u548c long \u90fd\u662f64\u4f4d\u5bbd\uff0c\u56e0\u6b64\u5bf9\u8fd9\u4e24\u79cd\u7c7b\u578b\u7684\u8bfb\u662f\u5206\u4e3a\u4e24\u90e8\u5206\u7684\uff0c\u7b2c\u4e00\u6b21\u8bfb\u53d6\u7b2c\u4e00\u4e2a 32 \u4f4d\uff0c\u7136\u540e\u518d\u8bfb\u5269\u4e0b\u7684 32 \u4f4d\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u4e0d\u662f\u539f\u5b50\u7684\uff0c\u4f46 Java \u4e2d volatile \u578b\u7684 long \u6216 double \u53d8\u91cf\u7684\u8bfb\u5199\u662f\u539f\u5b50\u7684\u3002volatile \u4fee\u590d\u7b26\u7684\u53e6\u4e00\u4e2a\u4f5c\u7528\u662f\u63d0\u4f9b\u5185\u5b58\u5c4f\u969c\uff08memory barrier\uff09\uff0c\u4f8b\u5982\u5728\u5206\u5e03\u5f0f\u6846\u67b6\u4e2d\u7684\u5e94\u7528\u3002\u7b80\u5355\u7684\u8bf4\uff0c\u5c31\u662f\u5f53\u4f60\u5199\u4e00\u4e2a volatile \u53d8\u91cf\u4e4b\u524d\uff0cJava \u5185\u5b58\u6a21\u578b\u4f1a\u63d2\u5165\u4e00\u4e2a\u5199\u5c4f\u969c\uff08write barrier\uff09\uff0c\u8bfb\u4e00\u4e2a volatile \u53d8\u91cf\u4e4b\u524d\uff0c\u4f1a\u63d2\u5165\u4e00\u4e2a\u8bfb\u5c4f\u969c\uff08read barrier\uff09\u3002\u610f\u601d\u5c31\u662f\u8bf4\uff0c\u5728\u4f60\u5199\u4e00\u4e2a volatile \u57df\u65f6\uff0c\u80fd\u4fdd\u8bc1\u4efb\u4f55\u7ebf\u7a0b\u90fd\u80fd\u770b\u5230\u4f60\u5199\u7684\u503c\uff0c\u540c\u65f6\uff0c\u5728\u5199\u4e4b\u524d\uff0c\u4e5f\u80fd\u4fdd\u8bc1\u4efb\u4f55\u6570\u503c\u7684\u66f4\u65b0\u5bf9\u6240\u6709\u7ebf\u7a0b\u662f\u53ef\u89c1\u7684\uff0c\u56e0\u4e3a\u5185\u5b58\u5c4f\u969c\u4f1a\u5c06\u5176\u4ed6\u6240\u6709\u5199\u7684\u503c\u66f4\u65b0\u5230\u7f13\u5b58\u3002<\/p>\n

4\uff09volatile \u7c7b\u578b\u53d8\u91cf\u63d0\u4f9b\u4ec0\u4e48\u4fdd\u8bc1\uff1f(\u7b54\u6848<\/a>)
\nvolatile \u53d8\u91cf\u63d0\u4f9b\u987a\u5e8f\u548c\u53ef\u89c1\u6027\u4fdd\u8bc1\uff0c\u4f8b\u5982\uff0cJVM \u6216\u8005 JIT\u4e3a\u4e86\u83b7\u5f97\u66f4\u597d\u7684\u6027\u80fd\u4f1a\u5bf9\u8bed\u53e5\u91cd\u6392\u5e8f\uff0c\u4f46\u662f volatile \u7c7b\u578b\u53d8\u91cf\u5373\u4f7f\u5728\u6ca1\u6709\u540c\u6b65\u5757\u7684\u60c5\u51b5\u4e0b\u8d4b\u503c\u4e5f\u4e0d\u4f1a\u4e0e\u5176\u4ed6\u8bed\u53e5\u91cd\u6392\u5e8f\u3002 volatile \u63d0\u4f9b happens-before \u7684\u4fdd\u8bc1\uff0c\u786e\u4fdd\u4e00\u4e2a\u7ebf\u7a0b\u7684\u4fee\u6539\u80fd\u5bf9\u5176\u4ed6\u7ebf\u7a0b\u662f\u53ef\u89c1\u7684\u3002\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0cvolatile \u8fd8\u80fd\u63d0\u4f9b\u539f\u5b50\u6027\uff0c\u5982\u8bfb 64 \u4f4d\u6570\u636e\u7c7b\u578b\uff0c\u50cf long \u548c double \u90fd\u4e0d\u662f\u539f\u5b50\u7684\uff0c\u4f46 volatile \u7c7b\u578b\u7684 double \u548c long \u5c31\u662f\u539f\u5b50\u7684\u3002<\/p>\n

5) 10 \u4e2a\u7ebf\u7a0b\u548c 2 \u4e2a\u7ebf\u7a0b\u7684\u540c\u6b65\u4ee3\u7801\uff0c\u54ea\u4e2a\u66f4\u5bb9\u6613\u5199\uff1f
\n\u4ece\u5199\u4ee3\u7801\u7684\u89d2\u5ea6\u6765\u8bf4\uff0c\u4e24\u8005\u7684\u590d\u6742\u5ea6\u662f\u76f8\u540c\u7684\uff0c\u56e0\u4e3a\u540c\u6b65\u4ee3\u7801\u4e0e\u7ebf\u7a0b\u6570\u91cf\u662f\u76f8\u4e92\u72ec\u7acb\u7684\u3002\u4f46\u662f\u540c\u6b65\u7b56\u7565\u7684\u9009\u62e9\u4f9d\u8d56\u4e8e\u7ebf\u7a0b\u7684\u6570\u91cf\uff0c\u56e0\u4e3a\u8d8a\u591a\u7684\u7ebf\u7a0b\u610f\u5473\u7740\u66f4\u5927\u7684\u7ade\u4e89\uff0c\u6240\u4ee5\u4f60\u9700\u8981\u5229\u7528\u540c\u6b65\u6280\u672f\uff0c\u5982\u9501\u5206\u79bb\uff0c\u8fd9\u8981\u6c42\u66f4\u590d\u6742\u7684\u4ee3\u7801\u548c\u4e13\u4e1a\u77e5\u8bc6\u3002<\/p>\n

6\uff09\u4f60\u662f\u5982\u4f55\u8c03\u7528 wait\uff08\uff09\u65b9\u6cd5\u7684\uff1f\u4f7f\u7528 if \u5757\u8fd8\u662f\u5faa\u73af\uff1f\u4e3a\u4ec0\u4e48\uff1f(\u7b54\u6848<\/a>)
\nwait() \u65b9\u6cd5\u5e94\u8be5\u5728\u5faa\u73af\u8c03\u7528\uff0c\u56e0\u4e3a\u5f53\u7ebf\u7a0b\u83b7\u53d6\u5230 CPU \u5f00\u59cb\u6267\u884c\u7684\u65f6\u5019\uff0c\u5176\u4ed6\u6761\u4ef6\u53ef\u80fd\u8fd8\u6ca1\u6709\u6ee1\u8db3\uff0c\u6240\u4ee5\u5728\u5904\u7406\u524d\uff0c\u5faa\u73af\u68c0\u6d4b\u6761\u4ef6\u662f\u5426\u6ee1\u8db3\u4f1a\u66f4\u597d\u3002\u4e0b\u9762\u662f\u4e00\u6bb5\u6807\u51c6\u7684\u4f7f\u7528 wait \u548c notify \u65b9\u6cd5\u7684\u4ee3\u7801\uff1a<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n
6<\/div>\n<\/td>\n
\n
\n
\/\/ The standard idiom for using the wait method<\/code><\/div>\n
synchronized<\/code> (obj) {<\/code><\/div>\n
while<\/code> (condition does not hold)<\/code><\/div>\n
obj.wait(); <\/code>\/\/ (Releases lock, and reacquires on wakeup)<\/code><\/div>\n
... <\/code>\/\/ Perform action appropriate to condition<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\u53c2\u89c1 Effective Java<\/a><\/span> \u7b2c 69 \u6761\uff0c\u83b7\u53d6\u66f4\u591a\u5173\u4e8e\u4e3a\u4ec0\u4e48\u5e94\u8be5\u5728\u5faa\u73af\u4e2d\u6765\u8c03\u7528 wait \u65b9\u6cd5\u7684\u5185\u5bb9\u3002<\/p>\n

7\uff09\u4ec0\u4e48\u662f\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u7684\u4f2a\u5171\u4eab\uff08false sharing\uff09\uff1f
\n\u4f2a\u5171\u4eab\u662f\u591a\u7ebf\u7a0b\u7cfb\u7edf\uff08\u6bcf\u4e2a\u5904\u7406\u5668\u6709\u81ea\u5df1\u7684\u5c40\u90e8\u7f13\u5b58\uff09\u4e2d\u4e00\u4e2a\u4f17\u6240\u5468\u77e5\u7684\u6027\u80fd\u95ee\u9898\u3002\u4f2a\u5171\u4eab\u53d1\u751f\u5728\u4e0d\u540c\u5904\u7406\u5668\u7684\u4e0a\u7684\u7ebf\u7a0b\u5bf9\u53d8\u91cf\u7684\u4fee\u6539\u4f9d\u8d56\u4e8e\u76f8\u540c\u7684\u7f13\u5b58\u884c\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n

\u6709\u7ecf\u9a8c\u7a0b\u5e8f\u5458\u7684 Java \u9762\u8bd5\u9898<\/h3>\n

\u4f2a\u5171\u4eab\u95ee\u9898\u5f88\u96be\u88ab\u53d1\u73b0\uff0c\u56e0\u4e3a\u7ebf\u7a0b\u53ef\u80fd\u8bbf\u95ee\u5b8c\u5168\u4e0d\u540c\u7684\u5168\u5c40\u53d8\u91cf\uff0c\u5185\u5b58\u4e2d\u5374\u78b0\u5de7\u5728\u5f88\u76f8\u8fd1\u7684\u4f4d\u7f6e\u4e0a\u3002\u5982\u5176\u4ed6\u8bf8\u591a\u7684\u5e76\u53d1\u95ee\u9898\uff0c\u907f\u514d\u4f2a\u5171\u4eab\u7684\u6700\u57fa\u672c\u65b9\u5f0f\u662f\u4ed4\u7ec6\u5ba1\u67e5\u4ee3\u7801\uff0c\u6839\u636e\u7f13\u5b58\u884c\u6765\u8c03\u6574\u4f60\u7684\u6570\u636e\u7ed3\u6784\u3002<\/p>\n

8\uff09\u4ec0\u4e48\u662f Busy spin\uff1f\u6211\u4eec\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u5b83\uff1f
\nBusy spin \u662f\u4e00\u79cd\u5728\u4e0d\u91ca\u653e CPU \u7684\u57fa\u7840\u4e0a\u7b49\u5f85\u4e8b\u4ef6\u7684\u6280\u672f\u3002\u5b83\u7ecf\u5e38\u7528\u4e8e\u907f\u514d\u4e22\u5931 CPU \u7f13\u5b58\u4e2d\u7684\u6570\u636e\uff08\u5982\u679c\u7ebf\u7a0b\u5148\u6682\u505c\uff0c\u4e4b\u540e\u5728\u5176\u4ed6CPU\u4e0a\u8fd0\u884c\u5c31\u4f1a\u4e22\u5931\uff09\u3002\u6240\u4ee5\uff0c\u5982\u679c\u4f60\u7684\u5de5\u4f5c\u8981\u6c42\u4f4e\u5ef6\u8fdf\uff0c\u5e76\u4e14\u4f60\u7684\u7ebf\u7a0b\u76ee\u524d\u6ca1\u6709\u4efb\u4f55\u987a\u5e8f\uff0c\u8fd9\u6837\u4f60\u5c31\u53ef\u4ee5\u901a\u8fc7\u5faa\u73af\u68c0\u6d4b\u961f\u5217\u4e2d\u7684\u65b0\u6d88\u606f\u6765\u4ee3\u66ff\u8c03\u7528 sleep() \u6216 wait() \u65b9\u6cd5\u3002\u5b83\u552f\u4e00\u7684\u597d\u5904\u5c31\u662f\u4f60\u53ea\u9700\u7b49\u5f85\u5f88\u77ed\u7684\u65f6\u95f4\uff0c\u5982\u51e0\u5fae\u79d2\u6216\u51e0\u7eb3\u79d2\u3002LMAX \u5206\u5e03\u5f0f\u6846\u67b6\u662f\u4e00\u4e2a\u9ad8\u6027\u80fd\u7ebf\u7a0b\u95f4\u901a\u4fe1\u7684\u5e93\uff0c\u8be5\u5e93\u6709\u4e00\u4e2a BusySpinWaitStrategy \u7c7b\u5c31\u662f\u57fa\u4e8e\u8fd9\u4e2a\u6982\u5ff5\u5b9e\u73b0\u7684\uff0c\u4f7f\u7528 busy spin \u5faa\u73af EventProcessors \u7b49\u5f85\u5c4f\u969c\u3002<\/p>\n

9\uff09Java \u4e2d\u600e\u4e48\u83b7\u53d6\u4e00\u4efd\u7ebf\u7a0b dump \u6587\u4ef6\uff1f
\n\u5728 Linux \u4e0b\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7\u547d\u4ee4 kill -3 PID \uff08Java \u8fdb\u7a0b\u7684\u8fdb\u7a0b ID\uff09\u6765\u83b7\u53d6 Java \u5e94\u7528\u7684 dump \u6587\u4ef6\u3002\u5728 Windows \u4e0b\uff0c\u4f60\u53ef\u4ee5\u6309\u4e0b Ctrl + Break \u6765\u83b7\u53d6\u3002\u8fd9\u6837 JVM \u5c31\u4f1a\u5c06\u7ebf\u7a0b\u7684 dump \u6587\u4ef6\u6253\u5370\u5230\u6807\u51c6\u8f93\u51fa\u6216\u9519\u8bef\u6587\u4ef6\u4e2d\uff0c\u5b83\u53ef\u80fd\u6253\u5370\u5728\u63a7\u5236\u53f0\u6216\u8005\u65e5\u5fd7\u6587\u4ef6\u4e2d\uff0c\u5177\u4f53\u4f4d\u7f6e\u4f9d\u8d56\u5e94\u7528\u7684\u914d\u7f6e\u3002\u5982\u679c\u4f60\u4f7f\u7528Tomcat\u3002<\/p>\n

10\uff09Swing \u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff1f(\u7b54\u6848<\/a>)
\n\u4e0d\u662f\uff0cSwing \u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002\u4f60\u4e0d\u80fd\u901a\u8fc7\u4efb\u4f55\u7ebf\u7a0b\u6765\u66f4\u65b0 Swing \u7ec4\u4ef6\uff0c\u5982 JTable\u3001JList \u6216 JPanel\uff0c\u4e8b\u5b9e\u4e0a\uff0c\u5b83\u4eec\u53ea\u80fd\u901a\u8fc7 GUI \u6216 AWT \u7ebf\u7a0b\u6765\u66f4\u65b0\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48 Swing \u63d0\u4f9b invokeAndWait() \u548c invokeLater() \u65b9\u6cd5\u6765\u83b7\u53d6\u5176\u4ed6\u7ebf\u7a0b\u7684 GUI \u66f4\u65b0\u8bf7\u6c42\u3002\u8fd9\u4e9b\u65b9\u6cd5\u5c06\u66f4\u65b0\u8bf7\u6c42\u653e\u5165 AWT \u7684\u7ebf\u7a0b\u961f\u5217\u4e2d\uff0c\u53ef\u4ee5\u4e00\u76f4\u7b49\u5f85\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7\u5f02\u6b65\u66f4\u65b0\u76f4\u63a5\u8fd4\u56de\u7ed3\u679c\u3002\u4f60\u4e5f\u53ef\u4ee5\u5728\u53c2\u8003\u7b54\u6848\u4e2d\u67e5\u770b\u548c\u5b66\u4e60\u5230\u66f4\u8be6\u7ec6\u7684\u5185\u5bb9\u3002<\/p>\n

11\uff09\u4ec0\u4e48\u662f\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\uff1f(\u7b54\u6848<\/a>)
\n\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u662f\u5c40\u9650\u4e8e\u7ebf\u7a0b\u5185\u90e8\u7684\u53d8\u91cf\uff0c\u5c5e\u4e8e\u7ebf\u7a0b\u81ea\u8eab\u6240\u6709\uff0c\u4e0d\u5728\u591a\u4e2a\u7ebf\u7a0b\u95f4\u5171\u4eab\u3002Java \u63d0\u4f9b ThreadLocal \u7c7b\u6765\u652f\u6301\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\uff0c\u662f\u4e00\u79cd\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u5f0f\u3002\u4f46\u662f\u5728\u7ba1\u7406\u73af\u5883\u4e0b\uff08\u5982 web \u670d\u52a1\u5668\uff09\u4f7f\u7528\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u7684\u65f6\u5019\u8981\u7279\u522b\u5c0f\u5fc3\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5de5\u4f5c\u7ebf\u7a0b\u7684\u751f\u547d\u5468\u671f\u6bd4\u4efb\u4f55\u5e94\u7528\u53d8\u91cf\u7684\u751f\u547d\u5468\u671f\u90fd\u8981\u957f\u3002\u4efb\u4f55\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u4e00\u65e6\u5728\u5de5\u4f5c\u5b8c\u6210\u540e\u6ca1\u6709\u91ca\u653e\uff0cJava \u5e94\u7528\u5c31\u5b58\u5728\u5185\u5b58\u6cc4\u9732\u7684\u98ce\u9669\u3002<\/p>\n

12\uff09\u7528 wait-notify \u5199\u4e00\u6bb5\u4ee3\u7801\u6765\u89e3\u51b3\u751f\u4ea7\u8005-\u6d88\u8d39\u8005\u95ee\u9898\uff1f(\u7b54\u6848<\/a>)
\n\u8bf7\u53c2\u8003\u7b54\u6848\u4e2d\u7684\u793a\u4f8b\u4ee3\u7801\u3002\u53ea\u8981\u8bb0\u4f4f\u5728\u540c\u6b65\u5757\u4e2d\u8c03\u7528 wait() \u548c notify()\u65b9\u6cd5\uff0c\u5982\u679c\u963b\u585e\uff0c\u901a\u8fc7\u5faa\u73af\u6765\u6d4b\u8bd5\u7b49\u5f85\u6761\u4ef6\u3002<\/p>\n

13) \u7528 Java \u5199\u4e00\u4e2a\u7ebf\u7a0b\u5b89\u5168\u7684\u5355\u4f8b\u6a21\u5f0f\uff08Singleton\uff09\uff1f(\u7b54\u6848<\/a>)
\n\u8bf7\u53c2\u8003\u7b54\u6848\u4e2d\u7684\u793a\u4f8b\u4ee3\u7801\uff0c\u8fd9\u91cc\u9762\u4e00\u6b65\u4e00\u6b65\u6559\u4f60\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u5b89\u5168\u7684 Java \u5355\u4f8b\u7c7b\u3002\u5f53\u6211\u4eec\u8bf4\u7ebf\u7a0b\u5b89\u5168\u65f6\uff0c\u610f\u601d\u662f\u5373\u4f7f\u521d\u59cb\u5316\u662f\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\uff0c\u4ecd\u7136\u80fd\u4fdd\u8bc1\u5355\u4e2a\u5b9e\u4f8b\u3002Java \u4e2d\uff0c\u4f7f\u7528\u679a\u4e3e\u4f5c\u4e3a\u5355\u4f8b\u7c7b\u662f\u6700\u7b80\u5355\u7684\u65b9\u5f0f\u6765\u521b\u5efa\u7ebf\u7a0b\u5b89\u5168\u5355\u4f8b\u6a21\u5f0f\u7684\u65b9\u5f0f\u3002<\/p>\n

14\uff09Java \u4e2d sleep \u65b9\u6cd5\u548c wait \u65b9\u6cd5\u7684\u533a\u522b\uff1f(\u7b54\u6848<\/a>)
\n\u867d\u7136\u4e24\u8005\u90fd\u662f\u7528\u6765\u6682\u505c\u5f53\u524d\u8fd0\u884c\u7684\u7ebf\u7a0b\uff0c\u4f46\u662f sleep() \u5b9e\u9645\u4e0a\u53ea\u662f\u77ed\u6682\u505c\u987f\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4f1a\u91ca\u653e\u9501\uff0c\u800c wait() \u610f\u5473\u7740\u6761\u4ef6\u7b49\u5f85\uff0c\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u8be5\u65b9\u6cd5\u8981\u91ca\u653e\u9501\uff0c\u56e0\u4e3a\u53ea\u6709\u8fd9\u6837\uff0c\u5176\u4ed6\u7b49\u5f85\u7684\u7ebf\u7a0b\u624d\u80fd\u5728\u6ee1\u8db3\u6761\u4ef6\u65f6\u83b7\u53d6\u5230\u8be5\u9501\u3002<\/p>\n

15\uff09\u4ec0\u4e48\u662f\u4e0d\u53ef\u53d8\u5bf9\u8c61\uff08immutable object\uff09\uff1fJava \u4e2d\u600e\u4e48\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u5bf9\u8c61\uff1f(\u7b54\u6848<\/a>)
\n\u4e0d\u53ef\u53d8\u5bf9\u8c61\u6307\u5bf9\u8c61\u4e00\u65e6\u88ab\u521b\u5efa\uff0c\u72b6\u6001\u5c31\u4e0d\u80fd\u518d\u6539\u53d8\u3002\u4efb\u4f55\u4fee\u6539\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff0c\u5982 String\u3001Integer\u53ca\u5176\u5b83\u5305\u88c5\u7c7b\u3002\u8be6\u60c5\u53c2\u89c1\u7b54\u6848\uff0c\u4e00\u6b65\u4e00\u6b65\u6307\u5bfc\u4f60\u5728 Java \u4e2d\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u7c7b\u3002<\/p>\n

16\uff09\u6211\u4eec\u80fd\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u53ef\u53d8\u5bf9\u8c61\u7684\u4e0d\u53ef\u53d8\u5bf9\u8c61\u5417\uff1f
\n\u662f\u7684\uff0c\u6211\u4eec\u662f\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u53ef\u53d8\u5bf9\u8c61\u7684\u4e0d\u53ef\u53d8\u5bf9\u8c61\u7684\uff0c\u4f60\u53ea\u9700\u8981\u8c28\u614e\u4e00\u70b9\uff0c\u4e0d\u8981\u5171\u4eab\u53ef\u53d8\u5bf9\u8c61\u7684\u5f15\u7528\u5c31\u53ef\u4ee5\u4e86\uff0c\u5982\u679c\u9700\u8981\u53d8\u5316\u65f6\uff0c\u5c31\u8fd4\u56de\u539f\u5bf9\u8c61\u7684\u4e00\u4e2a\u62f7\u8d1d\u3002\u6700\u5e38\u89c1\u7684\u4f8b\u5b50\u5c31\u662f\u5bf9\u8c61\u4e2d\u5305\u542b\u4e00\u4e2a\u65e5\u671f\u5bf9\u8c61\u7684\u5f15\u7528\u3002<\/p>\n

\u6570\u636e\u7c7b\u578b\u548c Java \u57fa\u7840\u9762\u8bd5\u95ee\u9898<\/h3>\n

17\uff09Java \u4e2d\u5e94\u8be5\u4f7f\u7528\u4ec0\u4e48\u6570\u636e\u7c7b\u578b\u6765\u4ee3\u8868\u4ef7\u683c\uff1f(\u7b54\u6848<\/a>)
\n\u5982\u679c\u4e0d\u662f\u7279\u522b\u5173\u5fc3\u5185\u5b58\u548c\u6027\u80fd\u7684\u8bdd\uff0c\u4f7f\u7528BigDecimal\uff0c\u5426\u5219\u4f7f\u7528\u9884\u5b9a\u4e49\u7cbe\u5ea6\u7684 double \u7c7b\u578b\u3002<\/p>\n

18\uff09\u600e\u4e48\u5c06 byte \u8f6c\u6362\u4e3a String\uff1f(\u7b54\u6848<\/a>)
\n\u53ef\u4ee5\u4f7f\u7528 String \u63a5\u6536 byte[] \u53c2\u6570\u7684\u6784\u9020\u5668\u6765\u8fdb\u884c\u8f6c\u6362\uff0c\u9700\u8981\u6ce8\u610f\u7684\u70b9\u662f\u8981\u4f7f\u7528\u7684\u6b63\u786e\u7684\u7f16\u7801\uff0c\u5426\u5219\u4f1a\u4f7f\u7528\u5e73\u53f0\u9ed8\u8ba4\u7f16\u7801\uff0c\u8fd9\u4e2a\u7f16\u7801\u53ef\u80fd\u8ddf\u539f\u6765\u7684\u7f16\u7801\u76f8\u540c\uff0c\u4e5f\u53ef\u80fd\u4e0d\u540c\u3002<\/p>\n

19\uff09Java \u4e2d\u600e\u6837\u5c06 bytes \u8f6c\u6362\u4e3a long \u7c7b\u578b\uff1f
\n\u8fd9\u4e2a\u95ee\u9898\u4f60\u6765\u56de\u7b54 \ud83d\ude42<\/p>\n

20\uff09\u6211\u4eec\u80fd\u5c06 int \u5f3a\u5236\u8f6c\u6362\u4e3a byte \u7c7b\u578b\u7684\u53d8\u91cf\u5417\uff1f\u5982\u679c\u8be5\u503c\u5927\u4e8e byte \u7c7b\u578b\u7684\u8303\u56f4\uff0c\u5c06\u4f1a\u51fa\u73b0\u4ec0\u4e48\u73b0\u8c61\uff1f
\n\u662f\u7684\uff0c\u6211\u4eec\u53ef\u4ee5\u505a\u5f3a\u5236\u8f6c\u6362\uff0c\u4f46\u662f Java \u4e2d int \u662f 32 \u4f4d\u7684\uff0c\u800c byte \u662f 8 \u4f4d\u7684\uff0c\u6240\u4ee5\uff0c\u5982\u679c\u5f3a\u5236\u8f6c\u5316\u662f\uff0cint \u7c7b\u578b\u7684\u9ad8 24 \u4f4d\u5c06\u4f1a\u88ab\u4e22\u5f03\uff0cbyte \u7c7b\u578b\u7684\u8303\u56f4\u662f\u4ece -128 \u5230 128\u3002<\/p>\n

21\uff09\u5b58\u5728\u4e24\u4e2a\u7c7b\uff0cB \u7ee7\u627f A\uff0cC \u7ee7\u627f B\uff0c\u6211\u4eec\u80fd\u5c06 B \u8f6c\u6362\u4e3a C \u4e48\uff1f\u5982 C = (C) B\uff1b(answer<\/a>\u7b54\u6848)<\/p>\n

22\uff09\u54ea\u4e2a\u7c7b\u5305\u542b clone \u65b9\u6cd5\uff1f\u662f Cloneable \u8fd8\u662f Object\uff1f(\u7b54\u6848<\/a>)
\njava.lang.Cloneable \u662f\u4e00\u4e2a\u6807\u793a\u6027\u63a5\u53e3\uff0c\u4e0d\u5305\u542b\u4efb\u4f55\u65b9\u6cd5\uff0cclone \u65b9\u6cd5\u5728 object \u7c7b\u4e2d\u5b9a\u4e49\u3002\u5e76\u4e14\u9700\u8981\u77e5\u9053 clone() \u65b9\u6cd5\u662f\u4e00\u4e2a\u672c\u5730\u65b9\u6cd5\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u662f\u7531 c \u6216 c++ \u6216 \u5176\u4ed6\u672c\u5730\u8bed\u8a00\u5b9e\u73b0\u7684\u3002<\/p>\n

23\uff09Java \u4e2d ++ \u64cd\u4f5c\u7b26\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u5417\uff1f(\u7b54\u6848)
\n23\uff09\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u64cd\u4f5c\u3002\u5b83\u6d89\u53ca\u5230\u591a\u4e2a\u6307\u4ee4\uff0c\u5982\u8bfb\u53d6\u53d8\u91cf\u503c\uff0c\u589e\u52a0\uff0c\u7136\u540e\u5b58\u50a8\u56de\u5185\u5b58\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u53ef\u80fd\u4f1a\u51fa\u73b0\u591a\u4e2a\u7ebf\u7a0b\u4ea4\u5dee\u3002<\/p>\n

24\uff09a = a + b \u4e0e a += b \u7684\u533a\u522b(\u7b54\u6848)
\n+= \u9690\u5f0f\u7684\u5c06\u52a0\u64cd\u4f5c\u7684\u7ed3\u679c\u7c7b\u578b\u5f3a\u5236\u8f6c\u6362\u4e3a\u6301\u6709\u7ed3\u679c\u7684\u7c7b\u578b\u3002\u5982\u679c\u4e24\u8fd9\u4e2a\u6574\u578b\u76f8\u52a0\uff0c\u5982 byte\u3001short \u6216\u8005 int\uff0c\u9996\u5148\u4f1a\u5c06\u5b83\u4eec\u63d0\u5347\u5230 int \u7c7b\u578b\uff0c\u7136\u540e\u5728\u6267\u884c\u52a0\u6cd5\u64cd\u4f5c\u3002\u5982\u679c\u52a0\u6cd5\u64cd\u4f5c\u7684\u7ed3\u679c\u6bd4 a \u7684\u6700\u5927\u503c\u8981\u5927\uff0c\u5219 a+b \u4f1a\u51fa\u73b0\u7f16\u8bd1\u9519\u8bef\uff0c\u4f46\u662f a += b \u6ca1\u95ee\u9898\uff0c\u5982\u4e0b\uff1a
\nbyte a = 127;
\nbyte b = 127;
\nb = a + b; \/\/ error : cannot convert from int to byte
\nb += a; \/\/ ok
\n\uff08\u8bd1\u8005\u6ce8\uff1a\u8fd9\u4e2a\u5730\u65b9\u5e94\u8be5\u8868\u8ff0\u7684\u6709\u8bef\uff0c\u5176\u5b9e\u65e0\u8bba a+b \u7684\u503c\u4e3a\u591a\u5c11\uff0c\u7f16\u8bd1\u5668\u90fd\u4f1a\u62a5\u9519\uff0c\u56e0\u4e3a a+b \u64cd\u4f5c\u4f1a\u5c06 a\u3001b \u63d0\u5347\u4e3a int \u7c7b\u578b\uff0c\u6240\u4ee5\u5c06 int \u7c7b\u578b\u8d4b\u503c\u7ed9 byte \u5c31\u4f1a\u7f16\u8bd1\u51fa\u9519\uff09<\/p>\n

25\uff09\u6211\u80fd\u5728\u4e0d\u8fdb\u884c\u5f3a\u5236\u8f6c\u6362\u7684\u60c5\u51b5\u4e0b\u5c06\u4e00\u4e2a double \u503c\u8d4b\u503c\u7ed9 long \u7c7b\u578b\u7684\u53d8\u91cf\u5417\uff1f(\u7b54\u6848<\/a>)
\n\u4e0d\u884c\uff0c\u4f60\u4e0d\u80fd\u5728\u6ca1\u6709\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u7684\u524d\u63d0\u4e0b\u5c06\u4e00\u4e2a double \u503c\u8d4b\u503c\u7ed9 long \u7c7b\u578b\u7684\u53d8\u91cf\uff0c\u56e0\u4e3a double \u7c7b\u578b\u7684\u8303\u56f4\u6bd4 long \u7c7b\u578b\u66f4\u5e7f\uff0c\u6240\u4ee5\u5fc5\u987b\u8981\u8fdb\u884c\u5f3a\u5236\u8f6c\u6362\u3002<\/p>\n

26\uff093*0.1 == 0.3 \u5c06\u4f1a\u8fd4\u56de\u4ec0\u4e48\uff1ftrue \u8fd8\u662f false\uff1f(\u7b54\u6848)
\nfalse\uff0c\u56e0\u4e3a\u6709\u4e9b\u6d6e\u70b9\u6570\u4e0d\u80fd\u5b8c\u5168\u7cbe\u786e\u7684\u8868\u793a\u51fa\u6765\u3002<\/p>\n

27\uff09int \u548c Integer \u54ea\u4e2a\u4f1a\u5360\u7528\u66f4\u591a\u7684\u5185\u5b58\uff1f(\u7b54\u6848)
\nInteger \u5bf9\u8c61\u4f1a\u5360\u7528\u66f4\u591a\u7684\u5185\u5b58\u3002Integer \u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u9700\u8981\u5b58\u50a8\u5bf9\u8c61\u7684\u5143\u6570\u636e\u3002\u4f46\u662f int \u662f\u4e00\u4e2a\u539f\u59cb\u7c7b\u578b\u7684\u6570\u636e\uff0c\u6240\u4ee5\u5360\u7528\u7684\u7a7a\u95f4\u66f4\u5c11\u3002<\/p>\n

28\uff09\u4e3a\u4ec0\u4e48 Java \u4e2d\u7684 String \u662f\u4e0d\u53ef\u53d8\u7684\uff08Immutable\uff09\uff1f(answer<\/a>\u7b54\u6848)
\nJava \u4e2d\u7684 String \u4e0d\u53ef\u53d8\u662f\u56e0\u4e3a Java \u7684\u8bbe\u8ba1\u8005\u8ba4\u4e3a\u5b57\u7b26\u4e32\u4f7f\u7528\u975e\u5e38\u9891\u7e41\uff0c\u5c06\u5b57\u7b26\u4e32\u8bbe\u7f6e\u4e3a\u4e0d\u53ef\u53d8\u53ef\u4ee5\u5141\u8bb8\u591a\u4e2a\u5ba2\u6237\u7aef\u4e4b\u95f4\u5171\u4eab\u76f8\u540c\u7684\u5b57\u7b26\u4e32\u3002\u66f4\u8be6\u7ec6\u7684\u5185\u5bb9\u53c2\u89c1\u7b54\u6848\u3002<\/p>\n

29\uff09\u6211\u4eec\u80fd\u5728 Switch \u4e2d\u4f7f\u7528 String \u5417\uff1f(answer<\/a>\u7b54\u6848)
\n\u4ece Java 7 \u5f00\u59cb\uff0c\u6211\u4eec\u53ef\u4ee5\u5728 switch case \u4e2d\u4f7f\u7528\u5b57\u7b26\u4e32\uff0c\u4f46\u8fd9\u4ec5\u4ec5\u662f\u4e00\u4e2a\u8bed\u6cd5\u7cd6\u3002\u5185\u90e8\u5b9e\u73b0\u5728 switch \u4e2d\u4f7f\u7528\u5b57\u7b26\u4e32\u7684 hash code\u3002<\/p>\n

30\uff09Java \u4e2d\u7684\u6784\u9020\u5668\u94fe\u662f\u4ec0\u4e48\uff1f(answer<\/a>\u7b54\u6848)
\n\u5f53\u4f60\u4ece\u4e00\u4e2a\u6784\u9020\u5668\u4e2d\u8c03\u7528\u53e6\u4e00\u4e2a\u6784\u9020\u5668\uff0c\u5c31\u662fJava \u4e2d\u7684\u6784\u9020\u5668\u94fe\u3002\u8fd9\u79cd\u60c5\u51b5\u53ea\u5728\u91cd\u8f7d\u4e86\u7c7b\u7684\u6784\u9020\u5668\u7684\u65f6\u5019\u624d\u4f1a\u51fa\u73b0\u3002<\/p>\n

JVM \u5e95\u5c42 \u4e0e GC\uff08Garbage Collection\uff09 \u7684\u9762\u8bd5\u95ee\u9898<\/h3>\n

31\uff0964 \u4f4d JVM \u4e2d\uff0cint \u7684\u957f\u5ea6\u662f\u591a\u6570\uff1f
\nJava \u4e2d\uff0cint \u7c7b\u578b\u53d8\u91cf\u7684\u957f\u5ea6\u662f\u4e00\u4e2a\u56fa\u5b9a\u503c\uff0c\u4e0e\u5e73\u53f0\u65e0\u5173\uff0c\u90fd\u662f 32 \u4f4d\u3002\u610f\u601d\u5c31\u662f\u8bf4\uff0c\u5728 32 \u4f4d \u548c 64 \u4f4d \u7684Java \u865a\u62df\u673a\u4e2d\uff0cint \u7c7b\u578b\u7684\u957f\u5ea6\u662f\u76f8\u540c\u7684\u3002<\/p>\n

32\uff09Serial \u4e0e Parallel GC\u4e4b\u95f4\u7684\u4e0d\u540c\u4e4b\u5904\uff1f(\u7b54\u6848<\/a>)
\nSerial \u4e0e Parallel \u5728GC\u6267\u884c\u7684\u65f6\u5019\u90fd\u4f1a\u5f15\u8d77 stop-the-world\u3002\u5b83\u4eec\u4e4b\u95f4\u4e3b\u8981\u4e0d\u540c serial \u6536\u96c6\u5668\u662f\u9ed8\u8ba4\u7684\u590d\u5236\u6536\u96c6\u5668\uff0c\u6267\u884c GC \u7684\u65f6\u5019\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u800c parallel \u6536\u96c6\u5668\u4f7f\u7528\u591a\u4e2a GC \u7ebf\u7a0b\u6765\u6267\u884c\u3002<\/p>\n

33\uff0932 \u4f4d\u548c 64 \u4f4d\u7684 JVM\uff0cint \u7c7b\u578b\u53d8\u91cf\u7684\u957f\u5ea6\u662f\u591a\u6570\uff1f(\u7b54\u6848)
\n32 \u4f4d\u548c 64 \u4f4d\u7684 JVM \u4e2d\uff0cint \u7c7b\u578b\u53d8\u91cf\u7684\u957f\u5ea6\u662f\u76f8\u540c\u7684\uff0c\u90fd\u662f 32 \u4f4d\u6216\u8005 4 \u4e2a\u5b57\u8282\u3002<\/p>\n

34\uff09Java \u4e2d WeakReference \u4e0e SoftReference\u7684\u533a\u522b\uff1f(\u7b54\u6848<\/a>)
\n\u867d\u7136 WeakReference \u4e0e SoftReference \u90fd\u6709\u5229\u4e8e\u63d0\u9ad8 GC \u548c \u5185\u5b58\u7684\u6548\u7387\uff0c\u4f46\u662f WeakReference \uff0c\u4e00\u65e6\u5931\u53bb\u6700\u540e\u4e00\u4e2a\u5f3a\u5f15\u7528\uff0c\u5c31\u4f1a\u88ab GC \u56de\u6536\uff0c\u800c\u8f6f\u5f15\u7528\u867d\u7136\u4e0d\u80fd\u963b\u6b62\u88ab\u56de\u6536\uff0c\u4f46\u662f\u53ef\u4ee5\u5ef6\u8fdf\u5230 JVM \u5185\u5b58\u4e0d\u8db3\u7684\u65f6\u5019\u3002<\/p>\n

35\uff09WeakHashMap \u662f\u600e\u4e48\u5de5\u4f5c\u7684\uff1f(\u7b54\u6848)
\nWeakHashMap \u7684\u5de5\u4f5c\u4e0e\u6b63\u5e38\u7684 HashMap \u7c7b\u4f3c\uff0c\u4f46\u662f\u4f7f\u7528\u5f31\u5f15\u7528\u4f5c\u4e3a key\uff0c\u610f\u601d\u5c31\u662f\u5f53 key \u5bf9\u8c61\u6ca1\u6709\u4efb\u4f55\u5f15\u7528\u65f6\uff0ckey\/value \u5c06\u4f1a\u88ab\u56de\u6536\u3002<\/p>\n

36\uff09JVM \u9009\u9879 -XX:+UseCompressedOops \u6709\u4ec0\u4e48\u4f5c\u7528\uff1f\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\uff1f(\u7b54\u6848)
\n\u5f53\u4f60\u5c06\u4f60\u7684\u5e94\u7528\u4ece 32 \u4f4d\u7684 JVM \u8fc1\u79fb\u5230 64 \u4f4d\u7684 JVM \u65f6\uff0c\u7531\u4e8e\u5bf9\u8c61\u7684\u6307\u9488\u4ece 32 \u4f4d\u589e\u52a0\u5230\u4e86 64 \u4f4d\uff0c\u56e0\u6b64\u5806\u5185\u5b58\u4f1a\u7a81\u7136\u589e\u52a0\uff0c\u5dee\u4e0d\u591a\u8981\u7ffb\u500d\u3002\u8fd9\u4e5f\u4f1a\u5bf9 CPU \u7f13\u5b58\uff08\u5bb9\u91cf\u6bd4\u5185\u5b58\u5c0f\u5f88\u591a\uff09\u7684\u6570\u636e\u4ea7\u751f\u4e0d\u5229\u7684\u5f71\u54cd\u3002\u56e0\u4e3a\uff0c\u8fc1\u79fb\u5230 64 \u4f4d\u7684 JVM \u4e3b\u8981\u52a8\u673a\u5728\u4e8e\u53ef\u4ee5\u6307\u5b9a\u6700\u5927\u5806\u5927\u5c0f\uff0c\u901a\u8fc7\u538b\u7f29 OOP \u53ef\u4ee5\u8282\u7701\u4e00\u5b9a\u7684\u5185\u5b58\u3002\u901a\u8fc7 -XX:+UseCompressedOops \u9009\u9879\uff0cJVM \u4f1a\u4f7f\u7528 32 \u4f4d\u7684 OOP\uff0c\u800c\u4e0d\u662f 64 \u4f4d\u7684 OOP\u3002<\/p>\n

37\uff09\u600e\u6837\u901a\u8fc7 Java \u7a0b\u5e8f\u6765\u5224\u65ad JVM \u662f 32 \u4f4d \u8fd8\u662f 64 \u4f4d\uff1f(\u7b54\u6848<\/a>)
\n\u4f60\u53ef\u4ee5\u68c0\u67e5\u67d0\u4e9b\u7cfb\u7edf\u5c5e\u6027\u5982 sun.arch.data.model \u6216 os.arch \u6765\u83b7\u53d6\u8be5\u4fe1\u606f\u3002<\/p>\n

38\uff0932 \u4f4d JVM \u548c 64 \u4f4d JVM \u7684\u6700\u5927\u5806\u5185\u5b58\u5206\u522b\u662f\u591a\u6570\uff1f(\u7b54\u6848<\/a>)
\n\u7406\u8bba\u4e0a\u8bf4\u4e0a 32 \u4f4d\u7684 JVM \u5806\u5185\u5b58\u53ef\u4ee5\u5230\u8fbe 2^32\uff0c\u5373 4GB\uff0c\u4f46\u5b9e\u9645\u4e0a\u4f1a\u6bd4\u8fd9\u4e2a\u5c0f\u5f88\u591a\u3002\u4e0d\u540c\u64cd\u4f5c\u7cfb\u7edf\u4e4b\u95f4\u4e0d\u540c\uff0c\u5982 Windows \u7cfb\u7edf\u5927\u7ea6 1.5 GB\uff0cSolaris \u5927\u7ea6 3GB\u300264 \u4f4d JVM\u5141\u8bb8\u6307\u5b9a\u6700\u5927\u7684\u5806\u5185\u5b58\uff0c\u7406\u8bba\u4e0a\u53ef\u4ee5\u8fbe\u5230 2^64\uff0c\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u5927\u7684\u6570\u5b57\uff0c\u5b9e\u9645\u4e0a\u4f60\u53ef\u4ee5\u6307\u5b9a\u5806\u5185\u5b58\u5927\u5c0f\u5230 100GB\u3002\u751a\u81f3\u6709\u7684 JVM\uff0c\u5982 Azul\uff0c\u5806\u5185\u5b58\u5230 1000G \u90fd\u662f\u53ef\u80fd\u7684\u3002<\/p>\n

39\uff09JRE\u3001JDK\u3001JVM \u53ca JIT \u4e4b\u95f4\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f(\u7b54\u6848<\/a>)
\nJRE \u4ee3\u8868 Java \u8fd0\u884c\u65f6\uff08Java run-time\uff09\uff0c\u662f\u8fd0\u884c Java \u5f15\u7528\u6240\u5fc5\u987b\u7684\u3002JDK \u4ee3\u8868 Java \u5f00\u53d1\u5de5\u5177\uff08Java development kit\uff09\uff0c\u662f Java \u7a0b\u5e8f\u7684\u5f00\u53d1\u5de5\u5177\uff0c\u5982 Java \u7f16\u8bd1\u5668\uff0c\u5b83\u4e5f\u5305\u542b JRE\u3002JVM \u4ee3\u8868 Java \u865a\u62df\u673a\uff08Java virtual machine\uff09\uff0c\u5b83\u7684\u8d23\u4efb\u662f\u8fd0\u884c Java \u5e94\u7528\u3002JIT \u4ee3\u8868\u5373\u65f6\u7f16\u8bd1\uff08Just In Time compilation\uff09\uff0c\u5f53\u4ee3\u7801\u6267\u884c\u7684\u6b21\u6570\u8d85\u8fc7\u4e00\u5b9a\u7684\u9608\u503c\u65f6\uff0c\u4f1a\u5c06 Java \u5b57\u8282\u7801\u8f6c\u6362\u4e3a\u672c\u5730\u4ee3\u7801\uff0c\u5982\uff0c\u4e3b\u8981\u7684\u70ed\u70b9\u4ee3\u7801\u4f1a\u88ab\u51c6\u6362\u4e3a\u672c\u5730\u4ee3\u7801\uff0c\u8fd9\u6837\u6709\u5229\u5927\u5e45\u5ea6\u63d0\u9ad8 Java \u5e94\u7528\u7684\u6027\u80fd\u3002<\/p>\n

3 \u5e74\u5de5\u4f5c\u7ecf\u9a8c\u7684 Java \u9762\u8bd5\u9898<\/p>\n

40\uff09\u89e3\u91ca Java \u5806\u7a7a\u95f4\u53ca GC\uff1f(\u7b54\u6848<\/a>)
\n\u5f53\u901a\u8fc7 Java \u547d\u4ee4\u542f\u52a8 Java \u8fdb\u7a0b\u7684\u65f6\u5019\uff0c\u4f1a\u4e3a\u5b83\u5206\u914d\u5185\u5b58\u3002\u5185\u5b58\u7684\u4e00\u90e8\u5206\u7528\u4e8e\u521b\u5efa\u5806\u7a7a\u95f4\uff0c\u5f53\u7a0b\u5e8f\u4e2d\u521b\u5efa\u5bf9\u8c61\u7684\u65f6\u5019\uff0c\u5c31\u4ece\u5bf9\u7a7a\u95f4\u4e2d\u5206\u914d\u5185\u5b58\u3002GC \u662f JVM \u5185\u90e8\u7684\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u56de\u6536\u65e0\u6548\u5bf9\u8c61\u7684\u5185\u5b58\u7528\u4e8e\u5c06\u6765\u7684\u5206\u914d\u3002<\/p>\n

 <\/p>\n

JVM \u5e95\u5c42\u9762\u8bd5\u9898\u53ca\u7b54\u6848<\/h3>\n

41\uff09\u4f60\u80fd\u4fdd\u8bc1 GC \u6267\u884c\u5417\uff1f(\u7b54\u6848)
\n\u4e0d\u80fd\uff0c\u867d\u7136\u4f60\u53ef\u4ee5\u8c03\u7528 System.gc() \u6216\u8005 Runtime.gc()\uff0c\u4f46\u662f\u6ca1\u6709\u529e\u6cd5\u4fdd\u8bc1 GC \u7684\u6267\u884c\u3002<\/p>\n

42\uff09\u600e\u4e48\u83b7\u53d6 Java \u7a0b\u5e8f\u4f7f\u7528\u7684\u5185\u5b58\uff1f\u5806\u4f7f\u7528\u7684\u767e\u5206\u6bd4\uff1f
\n\u53ef\u4ee5\u901a\u8fc7 java.lang.Runtime \u7c7b\u4e2d\u4e0e\u5185\u5b58\u76f8\u5173\u65b9\u6cd5\u6765\u83b7\u53d6\u5269\u4f59\u7684\u5185\u5b58\uff0c\u603b\u5185\u5b58\u53ca\u6700\u5927\u5806\u5185\u5b58\u3002\u901a\u8fc7\u8fd9\u4e9b\u65b9\u6cd5\u4f60\u4e5f\u53ef\u4ee5\u83b7\u53d6\u5230\u5806\u4f7f\u7528\u7684\u767e\u5206\u6bd4\u53ca\u5806\u5185\u5b58\u7684\u5269\u4f59\u7a7a\u95f4\u3002Runtime.freeMemory() \u65b9\u6cd5\u8fd4\u56de\u5269\u4f59\u7a7a\u95f4\u7684\u5b57\u8282\u6570\uff0cRuntime.totalMemory() \u65b9\u6cd5\u603b\u5185\u5b58\u7684\u5b57\u8282\u6570\uff0cRuntime.maxMemory() \u8fd4\u56de\u6700\u5927\u5185\u5b58\u7684\u5b57\u8282\u6570\u3002<\/p>\n

43\uff09Java \u4e2d\u5806\u548c\u6808\u6709\u4ec0\u4e48\u533a\u522b\uff1f(\u7b54\u6848<\/a>)
\nJVM \u4e2d\u5806\u548c\u6808\u5c5e\u4e8e\u4e0d\u540c\u7684\u5185\u5b58\u533a\u57df\uff0c\u4f7f\u7528\u76ee\u7684\u4e5f\u4e0d\u540c\u3002\u6808\u5e38\u7528\u4e8e\u4fdd\u5b58\u65b9\u6cd5\u5e27\u548c\u5c40\u90e8\u53d8\u91cf\uff0c\u800c\u5bf9\u8c61\u603b\u662f\u5728\u5806\u4e0a\u5206\u914d\u3002\u6808\u901a\u5e38\u90fd\u6bd4\u5806\u5c0f\uff0c\u4e5f\u4e0d\u4f1a\u5728\u591a\u4e2a\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\uff0c\u800c\u5806\u88ab\u6574\u4e2a JVM \u7684\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u3002<\/p>\n

<\/h3>\n

\u5173\u4e8e\u5185\u5b58\u7684\u7684\u9762\u8bd5\u95ee\u9898\u548c\u7b54\u6848<\/h3>\n

Java \u57fa\u672c\u6982\u5ff5\u9762\u8bd5\u9898<\/h3>\n

44\uff09\u201ca==b\u201d\u548c\u201da.equals(b)\u201d\u6709\u4ec0\u4e48\u533a\u522b\uff1f(\u7b54\u6848<\/a>)
\n\u5982\u679c a \u548c b \u90fd\u662f\u5bf9\u8c61\uff0c\u5219 a==b \u662f\u6bd4\u8f83\u4e24\u4e2a\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u53ea\u6709\u5f53 a \u548c b \u6307\u5411\u7684\u662f\u5806\u4e2d\u7684\u540c\u4e00\u4e2a\u5bf9\u8c61\u624d\u4f1a\u8fd4\u56de true\uff0c\u800c a.equals(b) \u662f\u8fdb\u884c\u903b\u8f91\u6bd4\u8f83\uff0c\u6240\u4ee5\u901a\u5e38\u9700\u8981\u91cd\u5199\u8be5\u65b9\u6cd5\u6765\u63d0\u4f9b\u903b\u8f91\u4e00\u81f4\u6027\u7684\u6bd4\u8f83\u3002\u4f8b\u5982\uff0cString \u7c7b\u91cd\u5199 equals() \u65b9\u6cd5\uff0c\u6240\u4ee5\u53ef\u4ee5\u7528\u4e8e\u4e24\u4e2a\u4e0d\u540c\u5bf9\u8c61\uff0c\u4f46\u662f\u5305\u542b\u7684\u5b57\u6bcd\u76f8\u540c\u7684\u6bd4\u8f83\u3002<\/p>\n

45\uff09a.hashCode() \u6709\u4ec0\u4e48\u7528\uff1f\u4e0e a.equals(b) \u6709\u4ec0\u4e48\u5173\u7cfb\uff1f(\u7b54\u6848<\/a>)
\nhashCode() \u65b9\u6cd5\u662f\u76f8\u5e94\u5bf9\u8c61\u6574\u578b\u7684 hash \u503c\u3002\u5b83\u5e38\u7528\u4e8e\u57fa\u4e8e hash \u7684\u96c6\u5408\u7c7b\uff0c\u5982 Hashtable\u3001HashMap\u3001LinkedHashMap\u7b49\u7b49\u3002\u5b83\u4e0e equals() \u65b9\u6cd5\u5173\u7cfb\u7279\u522b\u7d27\u5bc6\u3002\u6839\u636e Java \u89c4\u8303\uff0c\u4e24\u4e2a\u4f7f\u7528 equal() \u65b9\u6cd5\u6765\u5224\u65ad\u76f8\u7b49\u7684\u5bf9\u8c61\uff0c\u5fc5\u987b\u5177\u6709\u76f8\u540c\u7684 hash code\u3002<\/p>\n

46\uff09final\u3001finalize \u548c finally \u7684\u4e0d\u540c\u4e4b\u5904\uff1f(\u7b54\u6848<\/a>)
\nfinal \u662f\u4e00\u4e2a\u4fee\u9970\u7b26\uff0c\u53ef\u4ee5\u4fee\u9970\u53d8\u91cf\u3001\u65b9\u6cd5\u548c\u7c7b\u3002\u5982\u679c final \u4fee\u9970\u53d8\u91cf\uff0c\u610f\u5473\u7740\u8be5\u53d8\u91cf\u7684\u503c\u5728\u521d\u59cb\u5316\u540e\u4e0d\u80fd\u88ab\u6539\u53d8\u3002finalize \u65b9\u6cd5\u662f\u5728\u5bf9\u8c61\u88ab\u56de\u6536\u4e4b\u524d\u8c03\u7528\u7684\u65b9\u6cd5\uff0c\u7ed9\u5bf9\u8c61\u81ea\u5df1\u6700\u540e\u4e00\u4e2a\u590d\u6d3b\u7684\u673a\u4f1a\uff0c\u4f46\u662f\u4ec0\u4e48\u65f6\u5019\u8c03\u7528 finalize \u6ca1\u6709\u4fdd\u8bc1\u3002finally \u662f\u4e00\u4e2a\u5173\u952e\u5b57\uff0c\u4e0e try \u548c catch \u4e00\u8d77\u7528\u4e8e\u5f02\u5e38\u7684\u5904\u7406\u3002finally \u5757\u4e00\u5b9a\u4f1a\u88ab\u6267\u884c\uff0c\u65e0\u8bba\u5728 try \u5757\u4e2d\u662f\u5426\u6709\u53d1\u751f\u5f02\u5e38\u3002<\/p>\n

47\uff09Java \u4e2d\u7684\u7f16\u8bd1\u671f\u5e38\u91cf\u662f\u4ec0\u4e48\uff1f\u4f7f\u7528\u5b83\u53c8\u4ec0\u4e48\u98ce\u9669\uff1f
\n\u516c\u5171\u9759\u6001\u4e0d\u53ef\u53d8\uff08public static final \uff09\u53d8\u91cf\u4e5f\u5c31\u662f\u6211\u4eec\u6240\u8bf4\u7684\u7f16\u8bd1\u671f\u5e38\u91cf\uff0c\u8fd9\u91cc\u7684 public \u53ef\u9009\u7684\u3002\u5b9e\u9645\u4e0a\u8fd9\u4e9b\u53d8\u91cf\u5728\u7f16\u8bd1\u65f6\u4f1a\u88ab\u66ff\u6362\u6389\uff0c\u56e0\u4e3a\u7f16\u8bd1\u5668\u77e5\u9053\u8fd9\u4e9b\u53d8\u91cf\u7684\u503c\uff0c\u5e76\u4e14\u77e5\u9053\u8fd9\u4e9b\u53d8\u91cf\u5728\u8fd0\u884c\u65f6\u4e0d\u80fd\u6539\u53d8\u3002\u8fd9\u79cd\u65b9\u5f0f\u5b58\u5728\u7684\u4e00\u4e2a\u95ee\u9898\u662f\u4f60\u4f7f\u7528\u4e86\u4e00\u4e2a\u5185\u90e8\u7684\u6216\u7b2c\u4e09\u65b9\u5e93\u4e2d\u7684\u516c\u6709\u7f16\u8bd1\u65f6\u5e38\u91cf\uff0c\u4f46\u662f\u8fd9\u4e2a\u503c\u540e\u9762\u88ab\u5176\u4ed6\u4eba\u6539\u53d8\u4e86\uff0c\u4f46\u662f\u4f60\u7684\u5ba2\u6237\u7aef\u4ecd\u7136\u5728\u4f7f\u7528\u8001\u7684\u503c\uff0c\u751a\u81f3\u4f60\u5df2\u7ecf\u90e8\u7f72\u4e86\u4e00\u4e2a\u65b0\u7684jar\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u5f53\u4f60\u5728\u66f4\u65b0\u4f9d\u8d56 JAR \u6587\u4ef6\u65f6\uff0c\u786e\u4fdd\u91cd\u65b0\u7f16\u8bd1\u4f60\u7684\u7a0b\u5e8f\u3002<\/p>\n

Java \u96c6\u5408\u6846\u67b6\u7684\u9762\u8bd5\u9898<\/h3>\n

\u8fd9\u90e8\u5206\u4e5f\u5305\u542b\u6570\u636e\u7ed3\u6784\u3001\u7b97\u6cd5\u53ca\u6570\u7ec4\u7684\u9762\u8bd5\u95ee\u9898<\/p>\n

48) List\u3001Set\u3001Map \u548c Queue \u4e4b\u95f4\u7684\u533a\u522b(\u7b54\u6848)
\nList \u662f\u4e00\u4e2a\u6709\u5e8f\u96c6\u5408\uff0c\u5141\u8bb8\u5143\u7d20\u91cd\u590d\u3002\u5b83\u7684\u67d0\u4e9b\u5b9e\u73b0\u53ef\u4ee5\u63d0\u4f9b\u57fa\u4e8e\u4e0b\u6807\u503c\u7684\u5e38\u91cf\u8bbf\u95ee\u65f6\u95f4\uff0c\u4f46\u662f\u8fd9\u4e0d\u662f List \u63a5\u53e3\u4fdd\u8bc1\u7684\u3002Set \u662f\u4e00\u4e2a\u65e0\u5e8f\u96c6\u5408\u3002<\/p>\n

49\uff09poll() \u65b9\u6cd5\u548c remove() \u65b9\u6cd5\u7684\u533a\u522b\uff1f
\npoll() \u548c remove() \u90fd\u662f\u4ece\u961f\u5217\u4e2d\u53d6\u51fa\u4e00\u4e2a\u5143\u7d20\uff0c\u4f46\u662f poll() \u5728\u83b7\u53d6\u5143\u7d20\u5931\u8d25\u7684\u65f6\u5019\u4f1a\u8fd4\u56de\u7a7a\uff0c\u4f46\u662f remove() \u5931\u8d25\u7684\u65f6\u5019\u4f1a\u629b\u51fa\u5f02\u5e38\u3002<\/p>\n

50\uff09Java \u4e2d LinkedHashMap \u548c PriorityQueue \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f(\u7b54\u6848<\/a>)
\nPriorityQueue \u4fdd\u8bc1\u6700\u9ad8\u6216\u8005\u6700\u4f4e\u4f18\u5148\u7ea7\u7684\u7684\u5143\u7d20\u603b\u662f\u5728\u961f\u5217\u5934\u90e8\uff0c\u4f46\u662f LinkedHashMap \u7ef4\u6301\u7684\u987a\u5e8f\u662f\u5143\u7d20\u63d2\u5165\u7684\u987a\u5e8f\u3002\u5f53\u904d\u5386\u4e00\u4e2a PriorityQueue \u65f6\uff0c\u6ca1\u6709\u4efb\u4f55\u987a\u5e8f\u4fdd\u8bc1\uff0c\u4f46\u662f LinkedHashMap \u8bfe\u4fdd\u8bc1\u904d\u5386\u987a\u5e8f\u662f\u5143\u7d20\u63d2\u5165\u7684\u987a\u5e8f\u3002<\/p>\n

51\uff09ArrayList \u4e0e LinkedList \u7684\u4e0d\u533a\u522b\uff1f(\u7b54\u6848<\/a>)
\n\u6700\u660e\u663e\u7684\u533a\u522b\u662f ArrrayList \u5e95\u5c42\u7684\u6570\u636e\u7ed3\u6784\u662f\u6570\u7ec4\uff0c\u652f\u6301\u968f\u673a\u8bbf\u95ee\uff0c\u800c LinkedList \u7684\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u4e66\u94fe\u8868\uff0c\u4e0d\u652f\u6301\u968f\u673a\u8bbf\u95ee\u3002\u4f7f\u7528\u4e0b\u6807\u8bbf\u95ee\u4e00\u4e2a\u5143\u7d20\uff0cArrayList \u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662f O(1)\uff0c\u800c LinkedList \u662f O(n)\u3002\u66f4\u591a\u7ec6\u8282\u7684\u8ba8\u8bba\u53c2\u89c1\u7b54\u6848\u3002<\/p>\n

52\uff09\u7528\u54ea\u4e24\u79cd\u65b9\u5f0f\u6765\u5b9e\u73b0\u96c6\u5408\u7684\u6392\u5e8f\uff1f(\u7b54\u6848<\/a>)
\n\u4f60\u53ef\u4ee5\u4f7f\u7528\u6709\u5e8f\u96c6\u5408\uff0c\u5982 TreeSet \u6216 TreeMap\uff0c\u4f60\u4e5f\u53ef\u4ee5\u4f7f\u7528\u6709\u987a\u5e8f\u7684\u7684\u96c6\u5408\uff0c\u5982 list\uff0c\u7136\u540e\u901a\u8fc7 Collections.sort() \u6765\u6392\u5e8f\u3002<\/p>\n

53\uff09Java \u4e2d\u600e\u4e48\u6253\u5370\u6570\u7ec4\uff1f(answer<\/a>\u7b54\u6848)
\n\u4f60\u53ef\u4ee5\u4f7f\u7528 Arrays.toString() \u548c Arrays.deepToString() \u65b9\u6cd5\u6765\u6253\u5370\u6570\u7ec4\u3002\u7531\u4e8e\u6570\u7ec4\u6ca1\u6709\u5b9e\u73b0 toString() \u65b9\u6cd5\uff0c\u6240\u4ee5\u5982\u679c\u5c06\u6570\u7ec4\u4f20\u9012\u7ed9 System.out.println() \u65b9\u6cd5\uff0c\u5c06\u65e0\u6cd5\u6253\u5370\u51fa\u6570\u7ec4\u7684\u5185\u5bb9\uff0c\u4f46\u662f Arrays.toString() \u53ef\u4ee5\u6253\u5370\u6bcf\u4e2a\u5143\u7d20\u3002<\/p>\n

54\uff09Java \u4e2d\u7684 LinkedList \u662f\u5355\u5411\u94fe\u8868\u8fd8\u662f\u53cc\u5411\u94fe\u8868\uff1f(\u7b54\u6848)
\n\u662f\u53cc\u5411\u94fe\u8868\uff0c\u4f60\u53ef\u4ee5\u68c0\u67e5 JDK \u7684\u6e90\u7801\u3002\u5728 Eclipse<\/a><\/span>\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u5feb\u6377\u952e Ctrl + T\uff0c\u76f4\u63a5\u5728\u7f16\u8f91\u5668\u4e2d\u6253\u5f00\u8be5\u7c7b\u3002<\/p>\n

55\uff09Java \u4e2d\u7684 TreeMap \u662f\u91c7\u7528\u4ec0\u4e48\u6811\u5b9e\u73b0\u7684\uff1f(\u7b54\u6848)
\nJava \u4e2d\u7684 TreeMap \u662f\u4f7f\u7528\u7ea2\u9ed1\u6811\u5b9e\u73b0\u7684\u3002<\/p>\n

56) Hashtable \u4e0e HashMap \u6709\u4ec0\u4e48\u4e0d\u540c\u4e4b\u5904\uff1f(\u7b54\u6848<\/a>)
\n\u8fd9\u4e24\u4e2a\u7c7b\u6709\u8bb8\u591a\u4e0d\u540c\u7684\u5730\u65b9\uff0c\u4e0b\u9762\u5217\u51fa\u4e86\u4e00\u90e8\u5206\uff1a
\na) Hashtable \u662f JDK 1 \u9057\u7559\u4e0b\u6765\u7684\u7c7b\uff0c\u800c HashMap \u662f\u540e\u6765\u589e\u52a0\u7684\u3002
\nb\uff09Hashtable \u662f\u540c\u6b65\u7684\uff0c\u6bd4\u8f83\u6162\uff0c\u4f46 HashMap \u6ca1\u6709\u540c\u6b65\u7b56\u7565\uff0c\u6240\u4ee5\u4f1a\u66f4\u5feb\u3002
\nc\uff09Hashtable \u4e0d\u5141\u8bb8\u6709\u4e2a\u7a7a\u7684 key\uff0c\u4f46\u662f HashMap \u5141\u8bb8\u51fa\u73b0\u4e00\u4e2a null key\u3002
\n\u66f4\u591a\u7684\u4e0d\u540c\u4e4b\u5904\u53c2\u89c1\u7b54\u6848\u3002<\/p>\n

57\uff09Java \u4e2d\u7684 HashSet\uff0c\u5185\u90e8\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f(answer<\/a>\u7b54\u6848)
\nHashSet \u7684\u5185\u90e8\u91c7\u7528 HashMap\u6765\u5b9e\u73b0\u3002\u7531\u4e8e Map \u9700\u8981 key \u548c value\uff0c\u6240\u4ee5\u6240\u6709 key \u7684\u90fd\u6709\u4e00\u4e2a\u9ed8\u8ba4 value\u3002\u7c7b\u4f3c\u4e8e HashMap\uff0cHashSet \u4e0d\u5141\u8bb8\u91cd\u590d\u7684 key\uff0c\u53ea\u5141\u8bb8\u6709\u4e00\u4e2anull key\uff0c\u610f\u601d\u5c31\u662f HashSet \u4e2d\u53ea\u5141\u8bb8\u5b58\u50a8\u4e00\u4e2a null \u5bf9\u8c61\u3002<\/p>\n

58\uff09\u5199\u4e00\u6bb5\u4ee3\u7801\u5728\u904d\u5386 ArrayList \u65f6\u79fb\u9664\u4e00\u4e2a\u5143\u7d20\uff1f(\u7b54\u6848<\/a>)
\n\u8be5\u95ee\u9898\u7684\u5173\u952e\u5728\u4e8e\u9762\u8bd5\u8005\u4f7f\u7528\u7684\u662f ArrayList \u7684 remove() \u8fd8\u662f Iterator \u7684 remove()\u65b9\u6cd5\u3002\u8fd9\u6709\u4e00\u6bb5\u793a\u4f8b\u4ee3\u7801<\/a>\uff0c\u662f\u4f7f\u7528\u6b63\u786e\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u5728\u904d\u5386\u7684\u8fc7\u7a0b\u4e2d\u79fb\u9664\u5143\u7d20\uff0c\u800c\u4e0d\u4f1a\u51fa\u73b0 ConcurrentModificationException \u5f02\u5e38\u7684\u793a\u4f8b\u4ee3\u7801\u3002<\/p>\n

59\uff09\u6211\u4eec\u80fd\u81ea\u5df1\u5199\u4e00\u4e2a\u5bb9\u5668\u7c7b\uff0c\u7136\u540e\u4f7f\u7528 for-each \u5faa\u73af\u7801\uff1f
\n\u53ef\u4ee5\uff0c\u4f60\u53ef\u4ee5\u5199\u4e00\u4e2a\u81ea\u5df1\u7684\u5bb9\u5668\u7c7b\u3002\u5982\u679c\u4f60\u60f3\u4f7f\u7528 Java \u4e2d\u589e\u5f3a\u7684\u5faa\u73af\u6765\u904d\u5386\uff0c\u4f60\u53ea\u9700\u8981\u5b9e\u73b0 Iterable \u63a5\u53e3\u3002\u5982\u679c\u4f60\u5b9e\u73b0 Collection \u63a5\u53e3\uff0c\u9ed8\u8ba4\u5c31\u5177\u6709\u8be5\u5c5e\u6027\u3002<\/p>\n

60\uff09ArrayList \u548c HashMap \u7684\u9ed8\u8ba4\u5927\u5c0f\u662f\u591a\u6570\uff1f(\u7b54\u6848<\/a>)<\/p>\n

\u5728 Java 7 \u4e2d\uff0cArrayList \u7684\u9ed8\u8ba4\u5927\u5c0f\u662f 10 \u4e2a\u5143\u7d20\uff0cHashMap \u7684\u9ed8\u8ba4\u5927\u5c0f\u662f16\u4e2a\u5143\u7d20\uff08\u5fc5\u987b\u662f2\u7684\u5e42\uff09\u3002\u8fd9\u5c31\u662f Java 7 \u4e2d ArrayList \u548c HashMap \u7c7b\u7684\u4ee3\u7801\u7247\u6bb5\uff1a<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n<\/td>\n
\n
\n
\/\/ from ArrayList.java JDK 1.7<\/code><\/div>\n
private<\/code> static<\/code> final<\/code> int<\/code> DEFAULT_CAPACITY = <\/code>10<\/code>;<\/code><\/div>\n
<\/div>\n
\/\/from HashMap.java JDK 7<\/code><\/div>\n
static<\/code> final<\/code> int<\/code> DEFAULT_INITIAL_CAPACITY = <\/code>1<\/code> << <\/code>4<\/code>; <\/code>\/\/ aka 16<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

61\uff09\u6709\u6ca1\u6709\u53ef\u80fd\u4e24\u4e2a\u4e0d\u76f8\u7b49\u7684\u5bf9\u8c61\u6709\u6709\u76f8\u540c\u7684 hashcode\uff1f
\n\u6709\u53ef\u80fd\uff0c\u4e24\u4e2a\u4e0d\u76f8\u7b49\u7684\u5bf9\u8c61\u53ef\u80fd\u4f1a\u6709\u76f8\u540c\u7684 hashcode \u503c\uff0c\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u5728 hashmap \u4e2d\u4f1a\u6709\u51b2\u7a81\u3002\u76f8\u7b49 hashcode \u503c\u7684\u89c4\u5b9a\u53ea\u662f\u8bf4\u5982\u679c\u4e24\u4e2a\u5bf9\u8c61\u76f8\u7b49\uff0c\u5fc5\u987b\u6709\u76f8\u540c\u7684hashcode \u503c\uff0c\u4f46\u662f\u6ca1\u6709\u5173\u4e8e\u4e0d\u76f8\u7b49\u5bf9\u8c61\u7684\u4efb\u4f55\u89c4\u5b9a\u3002<\/p>\n

62\uff09\u4e24\u4e2a\u76f8\u540c\u7684\u5bf9\u8c61\u4f1a\u6709\u4e0d\u540c\u7684\u7684 hash code \u5417\uff1f
\n\u4e0d\u80fd\uff0c\u6839\u636e hash code \u7684\u89c4\u5b9a\uff0c\u8fd9\u662f\u4e0d\u53ef\u80fd\u7684\u3002<\/p>\n

63\uff09\u6211\u4eec\u53ef\u4ee5\u5728 hashcode() \u4e2d\u4f7f\u7528\u968f\u673a\u6570\u5b57\u5417\uff1f(\u7b54\u6848<\/a>)
\n\u4e0d\u884c\uff0c\u56e0\u4e3a\u5bf9\u8c61\u7684 hashcode \u503c\u5fc5\u987b\u662f\u76f8\u540c\u7684\u3002\u53c2\u89c1\u7b54\u6848\u83b7\u53d6\u66f4\u591a\u5173\u4e8e Java \u4e2d\u91cd\u5199 hashCode() \u65b9\u6cd5\u7684\u77e5\u8bc6\u3002<\/p>\n

64\uff09Java \u4e2d\uff0cComparator \u4e0e Comparable \u6709\u4ec0\u4e48\u4e0d\u540c\uff1f(\u7b54\u6848<\/a>)
\nComparable \u63a5\u53e3\u7528\u4e8e\u5b9a\u4e49\u5bf9\u8c61\u7684\u81ea\u7136\u987a\u5e8f\uff0c\u800c comparator \u901a\u5e38\u7528\u4e8e\u5b9a\u4e49\u7528\u6237\u5b9a\u5236\u7684\u987a\u5e8f\u3002Comparable \u603b\u662f\u53ea\u6709\u4e00\u4e2a\uff0c\u4f46\u662f\u53ef\u4ee5\u6709\u591a\u4e2a comparator \u6765\u5b9a\u4e49\u5bf9\u8c61\u7684\u987a\u5e8f\u3002<\/p>\n

65\uff09\u4e3a\u4ec0\u4e48\u5728\u91cd\u5199 equals \u65b9\u6cd5\u7684\u65f6\u5019\u9700\u8981\u91cd\u5199 hashCode \u65b9\u6cd5\uff1f(\u7b54\u6848<\/a>)
\n\u56e0\u4e3a\u6709\u5f3a\u5236\u7684\u89c4\u8303\u6307\u5b9a\u9700\u8981\u540c\u65f6\u91cd\u5199 hashcode \u4e0e equal \u662f\u65b9\u6cd5\uff0c\u8bb8\u591a\u5bb9\u5668\u7c7b\uff0c\u5982 HashMap\u3001HashSet \u90fd\u4f9d\u8d56\u4e8e hashcode \u4e0e equals \u7684\u89c4\u5b9a\u3002<\/p>\n

Java IO \u548c NIO \u7684\u9762\u8bd5\u9898<\/h3>\n

IO \u662f Java \u9762\u8bd5\u4e2d\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u70b9\u3002\u4f60\u5e94\u8be5\u5f88\u597d\u638c\u63e1 Java IO\uff0cNIO\uff0cNIO2 \u4ee5\u53ca\u4e0e\u64cd\u4f5c\u7cfb\u7edf\uff0c\u78c1\u76d8 IO \u76f8\u5173\u7684\u57fa\u7840\u77e5\u8bc6\u3002\u4e0b\u9762\u662f Java IO \u4e2d\u7ecf\u5e38\u95ee\u7684\u95ee\u9898\u3002<\/p>\n

66\uff09\u5728\u6211 Java \u7a0b\u5e8f\u4e2d\uff0c\u6211\u6709\u4e09\u4e2a socket\uff0c\u6211\u9700\u8981\u591a\u5c11\u4e2a\u7ebf\u7a0b\u6765\u5904\u7406\uff1f<\/p>\n

67\uff09Java \u4e2d\u600e\u4e48\u521b\u5efa ByteBuffer\uff1f<\/p>\n

68\uff09Java \u4e2d\uff0c\u600e\u4e48\u8bfb\u5199 ByteBuffer \uff1f<\/p>\n

69\uff09Java \u91c7\u7528\u7684\u662f\u5927\u7aef\u8fd8\u662f\u5c0f\u7aef\uff1f<\/p>\n

70\uff09ByteBuffer \u4e2d\u7684\u5b57\u8282\u5e8f\u662f\u4ec0\u4e48\uff1f<\/p>\n

71\uff09Java \u4e2d\uff0c\u76f4\u63a5\u7f13\u51b2\u533a\u4e0e\u975e\u76f4\u63a5\u7f13\u51b2\u5668\u6709\u4ec0\u4e48\u533a\u522b\uff1f(\u7b54\u6848<\/a>)<\/p>\n

72\uff09Java \u4e2d\u7684\u5185\u5b58\u6620\u5c04\u7f13\u5b58\u533a\u662f\u4ec0\u4e48\uff1f(answer<\/a>\u7b54\u6848)<\/p>\n

73\uff09socket \u9009\u9879 TCP NO DELAY \u662f\u6307\u4ec0\u4e48\uff1f<\/p>\n

74\uff09TCP \u534f\u8bae\u4e0e UDP \u534f\u8bae\u6709\u4ec0\u4e48\u533a\u522b\uff1f(answer<\/a>\u7b54\u6848)<\/p>\n

75\uff09Java \u4e2d\uff0cByteBuffer \u4e0e StringBuffer\u6709\u4ec0\u4e48\u533a\u522b\uff1f(\u7b54\u6848)<\/p>\n

Java \u6700\u4f73\u5b9e\u8df5\u7684\u9762\u8bd5\u95ee\u9898<\/h3>\n

\u5305\u542b Java \u4e2d\u5404\u4e2a\u90e8\u5206\u7684\u6700\u4f73\u5b9e\u8df5\uff0c\u5982\u96c6\u5408\uff0c\u5b57\u7b26\u4e32\uff0cIO\uff0c\u591a\u7ebf\u7a0b\uff0c\u9519\u8bef\u548c\u5f02\u5e38\u5904\u7406\uff0c\u8bbe\u8ba1\u6a21\u5f0f\u7b49\u7b49\u3002<\/p>\n

76\uff09Java \u4e2d\uff0c\u7f16\u5199\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u7684\u65f6\u5019\u4f60\u4f1a\u9075\u5faa\u54ea\u4e9b\u6700\u4f73\u5b9e\u8df5\uff1f(\u7b54\u6848<\/a>)
\n\u8fd9\u662f\u6211\u5728\u5199Java \u5e76\u53d1\u7a0b\u5e8f\u7684\u65f6\u5019\u9075\u5faa\u7684\u4e00\u4e9b\u6700\u4f73\u5b9e\u8df5\uff1a
\na\uff09\u7ed9\u7ebf\u7a0b\u547d\u540d\uff0c\u8fd9\u6837\u53ef\u4ee5\u5e2e\u52a9\u8c03\u8bd5\u3002
\nb\uff09\u6700\u5c0f\u5316\u540c\u6b65\u7684\u8303\u56f4\uff0c\u800c\u4e0d\u662f\u5c06\u6574\u4e2a\u65b9\u6cd5\u540c\u6b65\uff0c\u53ea\u5bf9\u5173\u952e\u90e8\u5206\u505a\u540c\u6b65\u3002
\nc\uff09\u5982\u679c\u53ef\u4ee5\uff0c\u66f4\u504f\u5411\u4e8e\u4f7f\u7528 volatile \u800c\u4e0d\u662f synchronized\u3002
\nd\uff09\u4f7f\u7528\u66f4\u9ad8\u5c42\u6b21\u7684\u5e76\u53d1\u5de5\u5177\uff0c\u800c\u4e0d\u662f\u4f7f\u7528 wait() \u548c notify() \u6765\u5b9e\u73b0\u7ebf\u7a0b\u95f4\u901a\u4fe1\uff0c\u5982 BlockingQueue\uff0cCountDownLatch \u53ca Semeaphore\u3002
\ne\uff09\u4f18\u5148\u4f7f\u7528\u5e76\u53d1\u96c6\u5408\uff0c\u800c\u4e0d\u662f\u5bf9\u96c6\u5408\u8fdb\u884c\u540c\u6b65\u3002\u5e76\u53d1\u96c6\u5408\u63d0\u4f9b\u66f4\u597d\u7684\u53ef\u6269\u5c55\u6027\u3002<\/p>\n

77\uff09\u8bf4\u51fa\u51e0\u70b9 Java \u4e2d\u4f7f\u7528 Collections \u7684\u6700\u4f73\u5b9e\u8df5(\u7b54\u6848)
\n\u8fd9\u662f\u6211\u5728\u4f7f\u7528 Java \u4e2d Collectionc \u7c7b\u7684\u4e00\u4e9b\u6700\u4f73\u5b9e\u8df5\uff1a
\na\uff09\u4f7f\u7528\u6b63\u786e\u7684\u96c6\u5408\u7c7b\uff0c\u4f8b\u5982\uff0c\u5982\u679c\u4e0d\u9700\u8981\u540c\u6b65\u5217\u8868\uff0c\u4f7f\u7528 ArrayList \u800c\u4e0d\u662f Vector\u3002
\nb\uff09\u4f18\u5148\u4f7f\u7528\u5e76\u53d1\u96c6\u5408\uff0c\u800c\u4e0d\u662f\u5bf9\u96c6\u5408\u8fdb\u884c\u540c\u6b65\u3002\u5e76\u53d1\u96c6\u5408\u63d0\u4f9b\u66f4\u597d\u7684\u53ef\u6269\u5c55\u6027\u3002
\nc\uff09\u4f7f\u7528\u63a5\u53e3\u4ee3\u8868\u548c\u8bbf\u95ee\u96c6\u5408\uff0c\u5982\u4f7f\u7528List\u5b58\u50a8 ArrayList\uff0c\u4f7f\u7528 Map \u5b58\u50a8 HashMap \u7b49\u7b49\u3002
\nd\uff09\u4f7f\u7528\u8fed\u4ee3\u5668\u6765\u5faa\u73af\u96c6\u5408\u3002
\ne\uff09\u4f7f\u7528\u96c6\u5408\u7684\u65f6\u5019\u4f7f\u7528\u6cdb\u578b\u3002<\/p>\n

78\uff09\u8bf4\u51fa\u81f3\u5c11 5 \u70b9\u5728 Java \u4e2d\u4f7f\u7528\u7ebf\u7a0b\u7684\u6700\u4f73\u5b9e\u8df5\u3002(\u7b54\u6848<\/a>)
\n\u8fd9\u4e2a\u95ee\u9898\u4e0e\u4e4b\u524d\u7684\u95ee\u9898\u7c7b\u4f3c\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u4e0a\u9762\u7684\u7b54\u6848\u3002\u5bf9\u7ebf\u7a0b\u6765\u8bf4\uff0c\u4f60\u5e94\u8be5\uff1a
\na\uff09\u5bf9\u7ebf\u7a0b\u547d\u540d
\nb\uff09\u5c06\u7ebf\u7a0b\u548c\u4efb\u52a1\u5206\u79bb\uff0c\u4f7f\u7528\u7ebf\u7a0b\u6c60\u6267\u884c\u5668\u6765\u6267\u884c Runnable \u6216 Callable\u3002
\nc\uff09\u4f7f\u7528\u7ebf\u7a0b\u6c60<\/p>\n

79\uff09\u8bf4\u51fa 5 \u6761 IO \u7684\u6700\u4f73\u5b9e\u8df5(\u7b54\u6848)
\nIO \u5bf9 Java \u5e94\u7528\u7684\u6027\u80fd\u975e\u5e38\u91cd\u8981\u3002\u7406\u60f3\u60c5\u51b5\u4e0b\uff0c\u4f60\u4e0d\u5e94\u8be5\u5728\u4f60\u5e94\u7528\u7684\u5173\u952e\u8def\u5f84\u4e0a\u907f\u514d IO \u64cd\u4f5c\u3002\u4e0b\u9762\u662f\u4e00\u4e9b\u4f60\u5e94\u8be5\u9075\u5faa\u7684 Java IO \u6700\u4f73\u5b9e\u8df5\uff1a
\na\uff09\u4f7f\u7528\u6709\u7f13\u51b2\u533a\u7684 IO \u7c7b\uff0c\u800c\u4e0d\u8981\u5355\u72ec\u8bfb\u53d6\u5b57\u8282\u6216\u5b57\u7b26\u3002
\nb\uff09\u4f7f\u7528 NIO \u548c NIO2
\nc\uff09\u5728 finally \u5757\u4e2d\u5173\u95ed\u6d41\uff0c\u6216\u8005\u4f7f\u7528 try-with-resource \u8bed\u53e5\u3002
\nd\uff09\u4f7f\u7528\u5185\u5b58\u6620\u5c04\u6587\u4ef6\u83b7\u53d6\u66f4\u5feb\u7684 IO\u3002<\/p>\n

80\uff09\u5217\u51fa 5 \u4e2a\u5e94\u8be5\u9075\u5faa\u7684 JDBC \u6700\u4f73\u5b9e\u8df5(\u7b54\u6848<\/a>)
\n\u6709\u5f88\u591a\u7684\u6700\u4f73\u5b9e\u8df5\uff0c\u4f60\u53ef\u4ee5\u6839\u636e\u4f60\u7684\u559c\u597d\u6765\u4f8b\u4e3e\u3002\u4e0b\u9762\u662f\u4e00\u4e9b\u66f4\u901a\u7528\u7684\u539f\u5219\uff1a
\na\uff09\u4f7f\u7528\u6279\u91cf\u7684\u64cd\u4f5c\u6765\u63d2\u5165\u548c\u66f4\u65b0\u6570\u636e
\nb\uff09\u4f7f\u7528 PreparedStatement \u6765\u907f\u514d SQL \u5f02\u5e38\uff0c\u5e76\u63d0\u9ad8\u6027\u80fd\u3002
\nc\uff09\u4f7f\u7528\u6570\u636e\u5e93\u8fde\u63a5\u6c60
\nd\uff09\u901a\u8fc7\u5217\u540d\u6765\u83b7\u53d6\u7ed3\u679c\u96c6\uff0c\u4e0d\u8981\u4f7f\u7528\u5217\u7684\u4e0b\u6807\u6765\u83b7\u53d6\u3002<\/p>\n

81\uff09\u8bf4\u51fa\u51e0\u6761 Java \u4e2d\u65b9\u6cd5\u91cd\u8f7d\u7684\u6700\u4f73\u5b9e\u8df5\uff1f(\u7b54\u6848<\/a>)
\n\u4e0b\u9762\u6709\u51e0\u6761\u53ef\u4ee5\u9075\u5faa\u7684\u65b9\u6cd5\u91cd\u8f7d\u7684\u6700\u4f73\u5b9e\u8df5\u6765\u907f\u514d\u9020\u6210\u81ea\u52a8\u88c5\u7bb1\u7684\u6df7\u4e71\u3002
\na\uff09\u4e0d\u8981\u91cd\u8f7d\u8fd9\u6837\u7684\u65b9\u6cd5\uff1a\u4e00\u4e2a\u65b9\u6cd5\u63a5\u6536 int \u53c2\u6570\uff0c\u800c\u53e6\u4e2a\u65b9\u6cd5\u63a5\u6536 Integer \u53c2\u6570\u3002
\nb\uff09\u4e0d\u8981\u91cd\u8f7d\u53c2\u6570\u6570\u91cf\u4e00\u81f4\uff0c\u800c\u53ea\u662f\u53c2\u6570\u987a\u5e8f\u4e0d\u540c\u7684\u65b9\u6cd5\u3002
\nc\uff09\u5982\u679c\u91cd\u8f7d\u7684\u65b9\u6cd5\u53c2\u6570\u4e2a\u6570\u591a\u4e8e 5 \u4e2a\uff0c\u91c7\u7528\u53ef\u53d8\u53c2\u6570\u3002<\/p>\n

Date\u3001Time \u53ca Calendar \u7684\u9762\u8bd5\u9898<\/h3>\n

82\uff09\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0cSimpleDateFormat \u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u5417\uff1f(\u7b54\u6848<\/a>)
\n\u4e0d\u662f\uff0c\u975e\u5e38\u4e0d\u5e78\uff0cDateFormat \u7684\u6240\u6709\u5b9e\u73b0\uff0c\u5305\u62ec SimpleDateFormat \u90fd\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u56e0\u6b64\u4f60\u4e0d\u5e94\u8be5\u5728\u591a\u7ebf\u7a0b\u5e8f\u4e2d\u4f7f\u7528\uff0c\u9664\u975e\u662f\u5728\u5bf9\u5916\u7ebf\u7a0b\u5b89\u5168\u7684\u73af\u5883\u4e2d\u4f7f\u7528\uff0c\u5982 \u5c06 SimpleDateFormat \u9650\u5236\u5728 ThreadLocal \u4e2d\u3002\u5982\u679c\u4f60\u4e0d\u8fd9\u4e48\u505a\uff0c\u5728\u89e3\u6790\u6216\u8005\u683c\u5f0f\u5316\u65e5\u671f\u7684\u65f6\u5019\uff0c\u53ef\u80fd\u4f1a\u83b7\u53d6\u5230\u4e00\u4e2a\u4e0d\u6b63\u786e\u7684\u7ed3\u679c\u3002\u56e0\u6b64\uff0c\u4ece\u65e5\u671f\u3001\u65f6\u95f4\u5904\u7406\u7684\u6240\u6709\u5b9e\u8df5\u6765\u8bf4\uff0c\u6211\u5f3a\u529b\u63a8\u8350 joda-time \u5e93\u3002<\/p>\n

83\uff09Java \u4e2d\u5982\u4f55\u683c\u5f0f\u5316\u4e00\u4e2a\u65e5\u671f\uff1f\u5982\u683c\u5f0f\u5316\u4e3a ddMMyyyy \u7684\u5f62\u5f0f\uff1f(\u7b54\u6848<\/a>)
\nJava \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 SimpleDateFormat \u7c7b\u6216\u8005 joda-time \u5e93\u6765\u683c\u5f0f\u65e5\u671f\u3002DateFormat \u7c7b\u5141\u8bb8\u4f60\u4f7f\u7528\u591a\u79cd\u6d41\u884c\u7684\u683c\u5f0f\u6765\u683c\u5f0f\u5316\u65e5\u671f\u3002\u53c2\u89c1\u7b54\u6848\u4e2d\u7684\u793a\u4f8b\u4ee3\u7801\uff0c\u4ee3\u7801\u4e2d\u6f14\u793a\u4e86\u5c06\u65e5\u671f\u683c\u5f0f\u5316\u6210\u4e0d\u540c\u7684\u683c\u5f0f\uff0c\u5982 dd-MM-yyyy \u6216 ddMMyyyy\u3002<\/p>\n

84\uff09Java \u4e2d\uff0c\u600e\u4e48\u5728\u683c\u5f0f\u5316\u7684\u65e5\u671f\u4e2d\u663e\u793a\u65f6\u533a\uff1f(\u7b54\u6848<\/a>)<\/p>\n

85\uff09Java \u4e2d java.util.Date \u4e0e java.sql.Date \u6709\u4ec0\u4e48\u533a\u522b\uff1f(\u7b54\u6848<\/a>)<\/p>\n

86\uff09Java \u4e2d\uff0c\u5982\u4f55\u8ba1\u7b97\u4e24\u4e2a\u65e5\u671f\u4e4b\u95f4\u7684\u5dee\u8ddd\uff1f(\u7a0b\u5e8f<\/a>)<\/p>\n

87\uff09Java \u4e2d\uff0c\u5982\u4f55\u5c06\u5b57\u7b26\u4e32 YYYYMMDD \u8f6c\u6362\u4e3a\u65e5\u671f\uff1f(\u7b54\u6848<\/a>)<\/p>\n

\u5355\u5143\u6d4b\u8bd5 JUnit \u9762\u8bd5\u9898<\/h3>\n

89\uff09\u5982\u4f55\u6d4b\u8bd5\u9759\u6001\u65b9\u6cd5\uff1f(\u7b54\u6848)
\n\u53ef\u4ee5\u4f7f\u7528 PowerMock \u5e93\u6765\u6d4b\u8bd5\u9759\u6001\u65b9\u6cd5\u3002<\/p>\n

90\uff09\u600e\u4e48\u5229\u7528 JUnit \u6765\u6d4b\u8bd5\u4e00\u4e2a\u65b9\u6cd5\u7684\u5f02\u5e38\uff1f(\u7b54\u6848<\/a>)<\/p>\n

91\uff09\u4f60\u4f7f\u7528\u8fc7\u54ea\u4e2a\u5355\u5143\u6d4b\u8bd5\u5e93\u6765\u6d4b\u8bd5\u4f60\u7684 Java \u7a0b\u5e8f\uff1f(\u7b54\u6848)<\/p>\n

92\uff09@Before \u548c @BeforeClass \u6709\u4ec0\u4e48\u533a\u522b\uff1f(\u7b54\u6848<\/a>)<\/p>\n

\u7f16\u7a0b\u548c\u4ee3\u7801\u76f8\u5173\u7684\u9762\u8bd5\u9898<\/h3>\n

93\uff09\u600e\u4e48\u68c0\u67e5\u4e00\u4e2a\u5b57\u7b26\u4e32\u53ea\u5305\u542b\u6570\u5b57\uff1f(\u89e3\u51b3\u65b9\u6848<\/a>)<\/p>\n

94\uff09Java \u4e2d\u5982\u4f55\u5229\u7528\u6cdb\u578b\u5199\u4e00\u4e2a LRU \u7f13\u5b58\uff1f(\u7b54\u6848<)<\/p>\n

95\uff09\u5199\u4e00\u6bb5 Java \u7a0b\u5e8f\u5c06 byte \u8f6c\u6362\u4e3a long\uff1f(\u7b54\u6848)<\/p>\n

95\uff09\u5728\u4e0d\u4f7f\u7528 StringBuffer \u7684\u524d\u63d0\u4e0b\uff0c\u600e\u4e48\u53cd\u8f6c\u4e00\u4e2a\u5b57\u7b26\u4e32\uff1f(\u89e3\u51b3\u65b9\u6848<\/a>)<\/p>\n

97\uff09Java \u4e2d\uff0c\u600e\u4e48\u83b7\u53d6\u4e00\u4e2a\u6587\u4ef6\u4e2d\u5355\u8bcd\u51fa\u73b0\u7684\u6700\u9ad8\u9891\u7387\uff1f(\u89e3\u51b3\u65b9\u6848<\/a>)<\/p>\n

98\uff09\u5982\u4f55\u68c0\u67e5\u51fa\u4e24\u4e2a\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u662f\u53cd\u5e8f\u7684\uff1f(\u89e3\u51b3\u65b9\u6848<\/a>)<\/p>\n

99\uff09Java \u4e2d\uff0c\u600e\u4e48\u6253\u5370\u51fa\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u6240\u6709\u6392\u5217\uff1f(\u89e3\u51b3\u65b9\u6848<\/a>)<\/p>\n

100\uff09Java \u4e2d\uff0c\u600e\u6837\u624d\u80fd\u6253\u5370\u51fa\u6570\u7ec4\u4e2d\u7684\u91cd\u590d\u5143\u7d20\uff1f(\u89e3\u51b3\u65b9\u6848<\/a>)<\/p>\n

101\uff09Java \u4e2d\u5982\u4f55\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6574\u6570\uff1f(\u89e3\u51b3\u65b9\u6848<\/a>)<\/p>\n

102\uff09\u5728\u6ca1\u6709\u4f7f\u7528\u4e34\u65f6\u53d8\u91cf\u7684\u60c5\u51b5\u5982\u4f55\u4ea4\u6362\u4e24\u4e2a\u6574\u6570\u53d8\u91cf\u7684\u503c\uff1f(\u89e3\u51b3\u65b9\u6848<\/a>)<\/p>\n

\u5173\u4e8e OOP \u548c\u8bbe\u8ba1\u6a21\u5f0f\u7684\u9762\u8bd5\u9898<\/h3>\n

\u8fd9\u90e8\u5206\u5305\u542b Java \u9762\u8bd5\u8fc7\u7a0b\u4e2d\u5173\u4e8e SOLID \u7684\u8bbe\u8ba1\u539f\u5219\uff0cOOP \u57fa\u7840\uff0c\u5982\u7c7b\uff0c\u5bf9\u8c61\uff0c\u63a5\u53e3\uff0c\u7ee7\u627f\uff0c\u591a\u6001\uff0c\u5c01\u88c5\uff0c\u62bd\u8c61\u4ee5\u53ca\u66f4\u9ad8\u7ea7\u7684\u4e00\u4e9b\u6982\u5ff5\uff0c\u5982\u7ec4\u5408\u3001\u805a\u5408\u53ca\u5173\u8054\u3002\u4e5f\u5305\u542b\u4e86 GOF \u8bbe\u8ba1\u6a21\u5f0f\u7684\u95ee\u9898\u3002<\/p>\n

103\uff09\u63a5\u53e3\u662f\u4ec0\u4e48\uff1f\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u63a5\u53e3\u800c\u4e0d\u662f\u76f4\u63a5\u4f7f\u7528\u5177\u4f53\u7c7b\uff1f
\n\u63a5\u53e3\u7528\u4e8e\u5b9a\u4e49 API\u3002\u5b83\u5b9a\u4e49\u4e86\u7c7b\u5fc5\u987b\u5f97\u9075\u5faa\u7684\u89c4\u5219\u3002\u540c\u65f6\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u62bd\u8c61\uff0c\u56e0\u4e3a\u5ba2\u6237\u7aef\u53ea\u4f7f\u7528\u63a5\u53e3\uff0c\u8fd9\u6837\u53ef\u4ee5\u6709\u591a\u91cd\u5b9e\u73b0\uff0c\u5982 List \u63a5\u53e3\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u53ef\u968f\u673a\u8bbf\u95ee\u7684 ArrayList\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u65b9\u4fbf\u63d2\u5165\u548c\u5220\u9664\u7684 LinkedList\u3002\u63a5\u53e3\u4e2d\u4e0d\u5141\u8bb8\u5199\u4ee3\u7801\uff0c\u4ee5\u6b64\u6765\u4fdd\u8bc1\u62bd\u8c61\uff0c\u4f46\u662f Java 8 \u4e2d\u4f60\u53ef\u4ee5\u5728\u63a5\u53e3\u58f0\u660e\u9759\u6001\u7684\u9ed8\u8ba4\u65b9\u6cd5\uff0c\u8fd9\u79cd\u65b9\u6cd5\u662f\u5177\u4f53\u7684\u3002<\/p>\n

104\uff09Java \u4e2d\uff0c\u62bd\u8c61\u7c7b\u4e0e\u63a5\u53e3\u4e4b\u95f4\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f(\u7b54\u6848<\/a>)
\nJava \u4e2d\uff0c\u62bd\u8c61\u7c7b\u548c\u63a5\u53e3\u6709\u5f88\u591a\u4e0d\u540c\u4e4b\u5904\uff0c\u4f46\u662f\u6700\u91cd\u8981\u7684\u4e00\u4e2a\u662f Java \u4e2d\u9650\u5236\u4e00\u4e2a\u7c7b\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u7c7b\uff0c\u4f46\u662f\u53ef\u4ee5\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3\u3002\u62bd\u8c61\u7c7b\u53ef\u4ee5\u5f88\u597d\u7684\u5b9a\u4e49\u4e00\u4e2a\u5bb6\u65cf\u7c7b\u7684\u9ed8\u8ba4\u884c\u4e3a\uff0c\u800c\u63a5\u53e3\u80fd\u66f4\u597d\u7684\u5b9a\u4e49\u7c7b\u578b\uff0c\u6709\u52a9\u4e8e\u540e\u9762\u5b9e\u73b0\u591a\u6001\u673a\u5236\u3002\u5173\u4e8e\u8fd9\u4e2a\u95ee\u9898\u7684\u8ba8\u8bba\u8bf7\u67e5\u770b\u7b54\u6848\u3002<\/p>\n

105\uff09\u9664\u4e86\u5355\u4f8b\u6a21\u5f0f\uff0c\u4f60\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u8fd8\u7528\u8fc7\u4ec0\u4e48\u8bbe\u8ba1\u6a21\u5f0f\uff1f
\n\u8fd9\u9700\u8981\u6839\u636e\u4f60\u7684\u7ecf\u9a8c\u6765\u56de\u7b54\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u4f60\u53ef\u4ee5\u8bf4\u4f9d\u8d56\u6ce8\u5165\uff0c\u5de5\u5382\u6a21\u5f0f\uff0c\u88c5\u9970\u6a21\u5f0f\u6216\u8005\u89c2\u5bdf\u8005\u6a21\u5f0f\uff0c\u968f\u610f\u9009\u62e9\u4f60\u4f7f\u7528\u8fc7\u7684\u4e00\u79cd\u5373\u53ef\u3002\u4e0d\u8fc7\u4f60\u8981\u51c6\u5907\u56de\u7b54\u63a5\u4e0b\u7684\u57fa\u4e8e\u4f60\u9009\u62e9\u7684\u6a21\u5f0f\u7684\u95ee\u9898\u3002<\/p>\n

106\uff09\u4f60\u80fd\u89e3\u91ca\u4e00\u4e0b\u91cc\u6c0f\u66ff\u6362\u539f\u5219\u5417?(\u7b54\u6848<\/a>)<\/p>\n

107) \u4ec0\u4e48\u60c5\u51b5\u4e0b\u4f1a\u8fdd\u53cd\u8fea\u7c73\u7279\u6cd5\u5219\uff1f\u4e3a\u4ec0\u4e48\u4f1a\u6709\u8fd9\u4e2a\u95ee\u9898\uff1f(\u7b54\u6848<\/a>)
\n\u8fea\u7c73\u7279\u6cd5\u5219\u5efa\u8bae\u201c\u53ea\u548c\u670b\u53cb\u8bf4\u8bdd\uff0c\u4e0d\u8981\u964c\u751f\u4eba\u8bf4\u8bdd\u201d\uff0c\u4ee5\u6b64\u6765\u51cf\u5c11\u7c7b\u4e4b\u95f4\u7684\u8026\u5408\u3002<\/p>\n

108\uff09\u9002\u914d\u5668\u6a21\u5f0f\u662f\u4ec0\u4e48\uff1f\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\uff1f
\n\u9002\u914d\u5668\u6a21\u5f0f\u63d0\u4f9b\u5bf9\u63a5\u53e3\u7684\u8f6c\u6362\u3002\u5982\u679c\u4f60\u7684\u5ba2\u6237\u7aef\u4f7f\u7528\u67d0\u4e9b\u63a5\u53e3\uff0c\u4f46\u662f\u4f60\u6709\u53e6\u5916\u4e00\u4e9b\u63a5\u53e3\uff0c\u4f60\u5c31\u53ef\u4ee5\u5199\u4e00\u4e2a\u9002\u914d\u53bb\u6765\u8fde\u63a5\u8fd9\u4e9b\u63a5\u53e3\u3002<\/p>\n

109\uff09\u4ec0\u4e48\u662f\u201c\u4f9d\u8d56\u6ce8\u5165\u201d\u548c\u201c\u63a7\u5236\u53cd\u8f6c\u201d\uff1f\u4e3a\u4ec0\u4e48\u6709\u4eba\u4f7f\u7528\uff1f(\u7b54\u6848<\/a>)<\/p>\n

110\uff09\u62bd\u8c61\u7c7b\u662f\u4ec0\u4e48\uff1f\u5b83\u4e0e\u63a5\u53e3\u6709\u4ec0\u4e48\u533a\u522b\uff1f\u4f60\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u8fc7\u62bd\u8c61\u7c7b\uff1f(\u7b54\u6848<\/a>)<\/p>\n

111\uff09\u6784\u9020\u5668\u6ce8\u5165\u548c setter \u4f9d\u8d56\u6ce8\u5165\uff0c\u90a3\u79cd\u65b9\u5f0f\u66f4\u597d\uff1f(\u7b54\u6848<\/a>)
\n\u6bcf\u79cd\u65b9\u5f0f\u90fd\u6709\u5b83\u7684\u7f3a\u70b9\u548c\u4f18\u70b9\u3002\u6784\u9020\u5668\u6ce8\u5165\u4fdd\u8bc1\u6240\u6709\u7684\u6ce8\u5165\u90fd\u88ab\u521d\u59cb\u5316\uff0c\u4f46\u662f setter \u6ce8\u5165\u63d0\u4f9b\u66f4\u597d\u7684\u7075\u6d3b\u6027\u6765\u8bbe\u7f6e\u53ef\u9009\u4f9d\u8d56\u3002\u5982\u679c\u4f7f\u7528 XML \u6765\u63cf\u8ff0\u4f9d\u8d56\uff0cSetter \u6ce8\u5165\u7684\u53ef\u8bfb\u5199\u4f1a\u66f4\u5f3a\u3002\u7ecf\u9a8c\u6cd5\u5219\u662f\u5f3a\u5236\u4f9d\u8d56\u4f7f\u7528\u6784\u9020\u5668\u6ce8\u5165\uff0c\u53ef\u9009\u4f9d\u8d56\u4f7f\u7528 setter \u6ce8\u5165\u3002<\/p>\n

112\uff09\u4f9d\u8d56\u6ce8\u5165\u548c\u5de5\u7a0b\u6a21\u5f0f\u4e4b\u95f4\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f(\u7b54\u6848<\/a>)
\n\u867d\u7136\u4e24\u79cd\u6a21\u5f0f\u90fd\u662f\u5c06\u5bf9\u8c61\u7684\u521b\u5efa\u4ece\u5e94\u7528\u7684\u903b\u8f91\u4e2d\u5206\u79bb\uff0c\u4f46\u662f\u4f9d\u8d56\u6ce8\u5165\u6bd4\u5de5\u7a0b\u6a21\u5f0f\u66f4\u6e05\u6670\u3002\u901a\u8fc7\u4f9d\u8d56\u6ce8\u5165\uff0c\u4f60\u7684\u7c7b\u5c31\u662f POJO\uff0c\u5b83\u53ea\u77e5\u9053\u4f9d\u8d56\u800c\u4e0d\u5173\u5fc3\u5b83\u4eec\u600e\u4e48\u83b7\u53d6\u3002\u4f7f\u7528\u5de5\u5382\u6a21\u5f0f\uff0c\u4f60\u7684\u7c7b\u9700\u8981\u901a\u8fc7\u5de5\u5382\u6765\u83b7\u53d6\u4f9d\u8d56\u3002\u56e0\u6b64\uff0c\u4f7f\u7528 DI \u4f1a\u6bd4\u4f7f\u7528\u5de5\u5382\u6a21\u5f0f\u66f4\u5bb9\u6613\u6d4b\u8bd5\u3002\u5173\u4e8e\u8fd9\u4e2a\u8bdd\u9898\u7684\u66f4\u8be6\u7ec6\u8ba8\u8bba\u8bf7\u53c2\u89c1\u7b54\u6848\u3002<\/p>\n

113\uff09\u9002\u914d\u5668\u6a21\u5f0f\u548c\u88c5\u9970\u5668\u6a21\u5f0f\u6709\u4ec0\u4e48\u533a\u522b\uff1f(\u7b54\u6848<\/a>)
\n\u867d\u7136\u9002\u914d\u5668\u6a21\u5f0f\u548c\u88c5\u9970\u5668\u6a21\u5f0f\u7684\u7ed3\u6784\u7c7b\u4f3c\uff0c\u4f46\u662f\u6bcf\u79cd\u6a21\u5f0f\u7684\u51fa\u73b0\u610f\u56fe\u4e0d\u540c\u3002\u9002\u914d\u5668\u6a21\u5f0f\u88ab\u7528\u4e8e\u6865\u63a5\u4e24\u4e2a\u63a5\u53e3\uff0c\u800c\u88c5\u9970\u6a21\u5f0f\u7684\u76ee\u7684\u662f\u5728\u4e0d\u4fee\u6539\u7c7b\u7684\u60c5\u51b5\u4e0b\u7ed9\u7c7b\u589e\u52a0\u65b0\u7684\u529f\u80fd\u3002<\/p>\n

114\uff09\u9002\u914d\u5668\u6a21\u5f0f\u548c\u4ee3\u7406\u6a21\u5f0f\u4e4b\u524d\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f(\u7b54\u6848<\/a>)
\n\u8fd9\u4e2a\u95ee\u9898\u4e0e\u524d\u9762\u7684\u7c7b\u4f3c\uff0c\u9002\u914d\u5668\u6a21\u5f0f\u548c\u4ee3\u7406\u6a21\u5f0f\u7684\u533a\u522b\u5728\u4e8e\u4ed6\u4eec\u7684\u610f\u56fe\u4e0d\u540c\u3002\u7531\u4e8e\u9002\u914d\u5668\u6a21\u5f0f\u548c\u4ee3\u7406\u6a21\u5f0f\u90fd\u662f\u5c01\u88c5\u771f\u6b63\u6267\u884c\u52a8\u4f5c\u7684\u7c7b\uff0c\u56e0\u6b64\u7ed3\u6784\u662f\u4e00\u81f4\u7684\uff0c\u4f46\u662f\u9002\u914d\u5668\u6a21\u5f0f\u7528\u4e8e\u63a5\u53e3\u4e4b\u95f4\u7684\u8f6c\u6362\uff0c\u800c\u4ee3\u7406\u6a21\u5f0f\u5219\u662f\u589e\u52a0\u4e00\u4e2a\u989d\u5916\u7684\u4e2d\u95f4\u5c42\uff0c\u4ee5\u4fbf\u652f\u6301\u5206\u914d\u3001\u63a7\u5236\u6216\u667a\u80fd\u8bbf\u95ee\u3002<\/p>\n

115\uff09\u4ec0\u4e48\u662f\u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f\uff1f(\u7b54\u6848)
\n\u6a21\u677f\u65b9\u6cd5\u63d0\u4f9b\u7b97\u6cd5\u7684\u6846\u67b6\uff0c\u4f60\u53ef\u4ee5\u81ea\u5df1\u53bb\u914d\u7f6e\u6216\u5b9a\u4e49\u6b65\u9aa4\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u5c06\u6392\u5e8f\u7b97\u6cd5\u770b\u505a\u662f\u4e00\u4e2a\u6a21\u677f\u3002\u5b83\u5b9a\u4e49\u4e86\u6392\u5e8f\u7684\u6b65\u9aa4\uff0c\u4f46\u662f\u5177\u4f53\u7684\u6bd4\u8f83\uff0c\u53ef\u4ee5\u4f7f\u7528 Comparable \u6216\u8005\u5176\u8bed\u8a00\u4e2d\u7c7b\u4f3c\u4e1c\u897f\uff0c\u5177\u4f53\u7b56\u7565\u7531\u4f60\u53bb\u914d\u7f6e\u3002\u5217\u51fa\u7b97\u6cd5\u6982\u8981\u7684\u65b9\u6cd5\u5c31\u662f\u4f17\u6240\u5468\u77e5\u7684\u6a21\u677f\u65b9\u6cd5\u3002<\/p>\n

116\uff09\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\u8bbf\u95ee\u8005\u6a21\u5f0f\uff1f(\u7b54\u6848)
\n\u8bbf\u95ee\u8005\u6a21\u5f0f\u7528\u4e8e\u89e3\u51b3\u5728\u7c7b\u7684\u7ee7\u627f\u5c42\u6b21\u4e0a\u589e\u52a0\u64cd\u4f5c\uff0c\u4f46\u662f\u4e0d\u76f4\u63a5\u4e0e\u4e4b\u5173\u8054\u3002\u8fd9\u79cd\u6a21\u5f0f\u91c7\u7528\u53cc\u6d3e\u53d1\u7684\u5f62\u5f0f\u6765\u589e\u52a0\u4e2d\u95f4\u5c42\u3002<\/p>\n

117\uff09\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\u7ec4\u5408\u6a21\u5f0f\uff1f(\u7b54\u6848)
\n\u7ec4\u5408\u6a21\u5f0f\u4f7f\u7528\u6811\u7ed3\u6784\u6765\u5c55\u793a\u90e8\u5206\u4e0e\u6574\u4f53\u7ee7\u627f\u5173\u7cfb\u3002\u5b83\u5141\u8bb8\u5ba2\u6237\u7aef\u91c7\u7528\u7edf\u4e00\u7684\u5f62\u5f0f\u6765\u5bf9\u5f85\u5355\u4e2a\u5bf9\u8c61\u548c\u5bf9\u8c61\u5bb9\u5668\u3002\u5f53\u4f60\u60f3\u8981\u5c55\u793a\u5bf9\u8c61\u8fd9\u79cd\u90e8\u5206\u4e0e\u6574\u4f53\u7684\u7ee7\u627f\u5173\u7cfb\u65f6\u91c7\u7528\u7ec4\u5408\u6a21\u5f0f\u3002<\/p>\n

118\uff09\u7ee7\u627f\u548c\u7ec4\u5408\u4e4b\u95f4\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f(\u7b54\u6848<\/a>)
\n\u867d\u7136\u4e24\u79cd\u90fd\u53ef\u4ee5\u5b9e\u73b0\u4ee3\u7801\u590d\u7528\uff0c\u4f46\u662f\u7ec4\u5408\u6bd4\u7ee7\u627f\u5171\u7075\u6d3b\uff0c\u56e0\u4e3a\u7ec4\u5408\u5141\u8bb8\u4f60\u5728\u8fd0\u884c\u65f6\u9009\u62e9\u4e0d\u540c\u7684\u5b9e\u73b0\u3002\u7528\u7ec4\u5408\u5b9e\u73b0\u7684\u4ee3\u7801\u4e5f\u6bd4\u7ee7\u627f\u6d4b\u8bd5\u8d77\u6765\u66f4\u52a0\u7b80\u5355\u3002<\/p>\n

119\uff09\u63cf\u8ff0 Java \u4e2d\u7684\u91cd\u8f7d\u548c\u91cd\u5199\uff1f(\u7b54\u6848<\/a>)
\n\u91cd\u8f7d\u548c\u91cd\u5199\u90fd\u5141\u8bb8\u4f60\u7528\u76f8\u540c\u7684\u540d\u79f0\u6765\u5b9e\u73b0\u4e0d\u540c\u7684\u529f\u80fd\uff0c\u4f46\u662f\u91cd\u8f7d\u662f\u7f16\u8bd1\u65f6\u6d3b\u52a8\uff0c\u800c\u91cd\u5199\u662f\u8fd0\u884c\u65f6\u6d3b\u52a8\u3002\u4f60\u53ef\u4ee5\u5728\u540c\u4e00\u4e2a\u7c7b\u4e2d\u91cd\u8f7d\u65b9\u6cd5\uff0c\u4f46\u662f\u53ea\u80fd\u5728\u5b50\u7c7b\u4e2d\u91cd\u5199\u65b9\u6cd5\u3002\u91cd\u5199\u5fc5\u987b\u8981\u6709\u7ee7\u627f\u3002<\/p>\n

120\uff09Java \u4e2d\uff0c\u5d4c\u5957\u516c\u5171\u9759\u6001\u7c7b\u4e0e\u9876\u7ea7\u7c7b\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f(\u7b54\u6848<\/a>)
\n\u7c7b\u7684\u5185\u90e8\u53ef\u4ee5\u6709\u591a\u4e2a\u5d4c\u5957\u516c\u5171\u9759\u6001\u7c7b\uff0c\u4f46\u662f\u4e00\u4e2a Java \u6e90\u6587\u4ef6\u53ea\u80fd\u6709\u4e00\u4e2a\u9876\u7ea7\u516c\u5171\u7c7b\uff0c\u5e76\u4e14\u9876\u7ea7\u516c\u5171\u7c7b\u7684\u540d\u79f0\u4e0e\u6e90\u6587\u4ef6\u540d\u79f0\u5fc5\u987b\u4e00\u81f4\u3002<\/p>\n

121) OOP \u4e2d\u7684 \u7ec4\u5408\u3001\u805a\u5408\u548c\u5173\u8054\u6709\u4ec0\u4e48\u533a\u522b\uff1f(\u7b54\u6848<\/a>)
\n\u5982\u679c\u4e24\u4e2a\u5bf9\u8c61\u5f7c\u6b64\u6709\u5173\u7cfb\uff0c\u5c31\u8bf4\u4ed6\u4eec\u662f\u5f7c\u6b64\u76f8\u5173\u8054\u7684\u3002\u7ec4\u5408\u548c\u805a\u5408\u662f\u9762\u5411\u5bf9\u8c61\u4e2d\u7684\u4e24\u79cd\u5f62\u5f0f\u7684\u5173\u8054\u3002\u7ec4\u5408\u662f\u4e00\u79cd\u6bd4\u805a\u5408\u66f4\u5f3a\u529b\u7684\u5173\u8054\u3002\u7ec4\u5408\u4e2d\uff0c\u4e00\u4e2a\u5bf9\u8c61\u662f\u53e6\u4e00\u4e2a\u7684\u62e5\u6709\u8005\uff0c\u800c\u805a\u5408\u5219\u662f\u6307\u4e00\u4e2a\u5bf9\u8c61\u4f7f\u7528\u53e6\u4e00\u4e2a\u5bf9\u8c61\u3002\u5982\u679c\u5bf9\u8c61 A \u662f\u7531\u5bf9\u8c61 B \u7ec4\u5408\u7684\uff0c\u5219 A \u4e0d\u5b58\u5728\u7684\u8bdd\uff0cB\u4e00\u5b9a\u4e0d\u5b58\u5728\uff0c\u4f46\u662f\u5982\u679c A \u5bf9\u8c61\u805a\u5408\u4e86\u4e00\u4e2a\u5bf9\u8c61 B\uff0c\u5219\u5373\u4f7f A \u4e0d\u5b58\u5728\u4e86\uff0cB \u4e5f\u53ef\u4ee5\u5355\u72ec\u5b58\u5728\u3002<\/p>\n

122\uff09\u7ed9\u6211\u4e00\u4e2a\u7b26\u5408\u5f00\u95ed\u539f\u5219\u7684\u8bbe\u8ba1\u6a21\u5f0f\u7684\u4f8b\u5b50\uff1f(\u7b54\u6848<\/a>)
\n\u5f00\u95ed\u539f\u5219\u8981\u6c42\u4f60\u7684\u4ee3\u7801\u5bf9\u6269\u5c55\u5f00\u653e\uff0c\u5bf9\u4fee\u6539\u5173\u95ed\u3002\u8fd9\u4e2a\u610f\u601d\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u4f60\u60f3\u589e\u52a0\u4e00\u4e2a\u65b0\u7684\u529f\u80fd\uff0c\u4f60\u53ef\u4ee5\u5f88\u5bb9\u6613\u7684\u5728\u4e0d\u6539\u53d8\u5df2\u6d4b\u8bd5\u8fc7\u7684\u4ee3\u7801\u7684\u524d\u63d0\u4e0b\u589e\u52a0\u65b0\u7684\u4ee3\u7801\u3002\u6709\u597d\u51e0\u4e2a\u8bbe\u8ba1\u6a21\u5f0f\u662f\u57fa\u4e8e\u5f00\u95ed\u539f\u5219\u7684\uff0c\u5982\u7b56\u7565\u6a21\u5f0f\uff0c\u5982\u679c\u4f60\u9700\u8981\u4e00\u4e2a\u65b0\u7684\u7b56\u7565\uff0c\u53ea\u9700\u8981\u5b9e\u73b0\u63a5\u53e3\uff0c\u589e\u52a0\u914d\u7f6e\uff0c\u4e0d\u9700\u8981\u6539\u53d8\u6838\u5fc3\u903b\u8f91\u3002\u4e00\u4e2a\u6b63\u5728\u5de5\u4f5c\u7684\u4f8b\u5b50\u662f Collections.sort() \u65b9\u6cd5\uff0c\u8fd9\u5c31\u662f\u57fa\u4e8e\u7b56\u7565\u6a21\u5f0f\uff0c\u9075\u5faa\u5f00\u95ed\u539f\u5219\u7684\uff0c\u4f60\u4e0d\u9700\u4e3a\u65b0\u7684\u5bf9\u8c61\u4fee\u6539 sort() \u65b9\u6cd5\uff0c\u4f60\u9700\u8981\u505a\u7684\u4ec5\u4ec5\u662f\u5b9e\u73b0\u4f60\u81ea\u5df1\u7684 Comparator \u63a5\u53e3\u3002<\/p>\n

123\uff09\u62bd\u8c61\u5de5\u5382\u6a21\u5f0f\u548c\u539f\u578b\u6a21\u5f0f\u4e4b\u95f4\u7684\u533a\u522b\uff1f(\u7b54\u6848)<\/p>\n

124\uff09\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\u4eab\u5143\u6a21\u5f0f\uff1f(\u7b54\u6848)
\n\u4eab\u5143\u6a21\u5f0f\u901a\u8fc7\u5171\u4eab\u5bf9\u8c61\u6765\u907f\u514d\u521b\u5efa\u592a\u591a\u7684\u5bf9\u8c61\u3002\u4e3a\u4e86\u4f7f\u7528\u4eab\u5143\u6a21\u5f0f\uff0c\u4f60\u9700\u8981\u786e\u4fdd\u4f60\u7684\u5bf9\u8c61\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u8fd9\u6837\u4f60\u624d\u80fd\u5b89\u5168\u7684\u5171\u4eab\u3002JDK \u4e2d String \u6c60\u3001Integer \u6c60\u4ee5\u53ca Long \u6c60\u90fd\u662f\u5f88\u597d\u7684\u4f7f\u7528\u4e86\u4eab\u5143\u6a21\u5f0f\u7684\u4f8b\u5b50\u3002<\/p>\n

Java \u9762\u8bd5\u4e2d\u5176\u4ed6\u5404\u5f0f\u5404\u6837\u7684\u95ee\u9898<\/h3>\n

\u8fd9\u90e8\u5206\u5305\u542b Java \u4e2d\u5173\u4e8e XML \u7684\u9762\u8bd5\u9898\uff0cJDBC \u9762\u8bd5\u9898<\/a><\/span>\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u9762\u8bd5\u9898\uff0cJava \u9519\u8bef\u548c\u5f02\u5e38\u53ca\u5e8f\u5217\u5316\u9762\u8bd5\u9898<\/p>\n

125\uff09\u5d4c\u5957\u9759\u6001\u7c7b\u4e0e\u9876\u7ea7\u7c7b\u6709\u4ec0\u4e48\u533a\u522b\uff1f(\u7b54\u6848<\/a>)
\n\u4e00\u4e2a\u516c\u5171\u7684\u9876\u7ea7\u7c7b\u7684\u6e90\u6587\u4ef6\u540d\u79f0\u4e0e\u7c7b\u540d\u76f8\u540c\uff0c\u800c\u5d4c\u5957\u9759\u6001\u7c7b\u6ca1\u6709\u8fd9\u4e2a\u8981\u6c42\u3002\u4e00\u4e2a\u5d4c\u5957\u7c7b\u4f4d\u4e8e\u9876\u7ea7\u7c7b\u5185\u90e8\uff0c\u9700\u8981\u4f7f\u7528\u9876\u7ea7\u7c7b\u7684\u540d\u79f0\u6765\u5f15\u7528\u5d4c\u5957\u9759\u6001\u7c7b\uff0c\u5982 HashMap.Entry \u662f\u4e00\u4e2a\u5d4c\u5957\u9759\u6001\u7c7b\uff0cHashMap \u662f\u4e00\u4e2a\u9876\u7ea7\u7c7b\uff0cEntry\u662f\u4e00\u4e2a\u5d4c\u5957\u9759\u6001\u7c7b\u3002<\/p>\n

126\uff09\u4f60\u80fd\u5199\u51fa\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u6765\u5224\u65ad\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u662f\u4e00\u4e2a\u6570\u5b57\u5417\uff1f(\u89e3\u51b3\u65b9\u6848<\/a>)
\n\u4e00\u4e2a\u6570\u5b57\u5b57\u7b26\u4e32\uff0c\u53ea\u80fd\u5305\u542b\u6570\u5b57\uff0c\u5982 0 \u5230 9 \u4ee5\u53ca +\u3001- \u5f00\u5934\uff0c\u901a\u8fc7\u8fd9\u4e2a\u4fe1\u606f\uff0c\u4f60\u53ef\u4ee5\u4e0b\u4e00\u4e2a\u5982\u4e0b\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u6765\u5224\u65ad\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u662f\u4e0d\u662f\u6570\u5b57\u3002<\/p>\n

127\uff09Java \u4e2d\uff0c\u53d7\u68c0\u67e5\u5f02\u5e38 \u548c \u4e0d\u53d7\u68c0\u67e5\u5f02\u5e38\u7684\u533a\u522b\uff1f(\u7b54\u6848<\/a>)
\n\u53d7\u68c0\u67e5\u5f02\u5e38\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u671f\u95f4\u68c0\u67e5\u3002\u5bf9\u4e8e\u8fd9\u79cd\u5f02\u5e38\uff0c\u65b9\u6cd5\u5f3a\u5236\u5904\u7406\u6216\u8005\u901a\u8fc7 throws \u5b50\u53e5\u58f0\u660e\u3002\u5176\u4e2d\u4e00\u79cd\u60c5\u51b5\u662f Exception \u7684\u5b50\u7c7b\u4f46\u4e0d\u662f RuntimeException \u7684\u5b50\u7c7b\u3002\u975e\u53d7\u68c0\u67e5\u662f RuntimeException \u7684\u5b50\u7c7b\uff0c\u5728\u7f16\u8bd1\u9636\u6bb5\u4e0d\u53d7\u7f16\u8bd1\u5668\u7684\u68c0\u67e5\u3002<\/p>\n

128\uff09Java \u4e2d\uff0cthrow \u548c throws \u6709\u4ec0\u4e48\u533a\u522b\uff1f(\u7b54\u6848<\/a>)<\/p>\n

throw \u7528\u4e8e\u629b\u51fa java.lang.Throwable \u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\u5316\u5bf9\u8c61\uff0c\u610f\u601d\u662f\u8bf4\u4f60\u53ef\u4ee5\u901a\u8fc7\u5173\u952e\u5b57 throw \u629b\u51fa\u4e00\u4e2a Error \u6216\u8005 \u4e00\u4e2aException\uff0c\u5982\uff1a
\nthrow new IllegalArgumentException(\u201csize must be multiple of 2\u2033)<\/p>\n

\u800cthrows \u7684\u4f5c\u7528\u662f\u4f5c\u4e3a\u65b9\u6cd5\u58f0\u660e\u548c\u7b7e\u540d\u7684\u4e00\u90e8\u5206\uff0c\u65b9\u6cd5\u88ab\u629b\u51fa\u76f8\u5e94\u7684\u5f02\u5e38\u4ee5\u4fbf\u8c03\u7528\u8005\u80fd\u5904\u7406\u3002Java \u4e2d\uff0c\u4efb\u4f55\u672a\u5904\u7406\u7684\u53d7\u68c0\u67e5\u5f02\u5e38\u5f3a\u5236\u5728 throws \u5b50\u53e5\u4e2d\u58f0\u660e\u3002<\/p>\n

129\uff09Java \u4e2d\uff0cSerializable \u4e0e Externalizable \u7684\u533a\u522b\uff1f(\u7b54\u6848<\/a>)
\nSerializable \u63a5\u53e3\u662f\u4e00\u4e2a\u5e8f\u5217\u5316 Java \u7c7b\u7684\u63a5\u53e3\uff0c\u4ee5\u4fbf\u4e8e\u5b83\u4eec\u53ef\u4ee5\u5728\u7f51\u7edc\u4e0a\u4f20\u8f93\u6216\u8005\u53ef\u4ee5\u5c06\u5b83\u4eec\u7684\u72b6\u6001\u4fdd\u5b58\u5728\u78c1\u76d8\u4e0a\uff0c\u662f JVM \u5185\u5d4c\u7684\u9ed8\u8ba4\u5e8f\u5217\u5316\u65b9\u5f0f\uff0c\u6210\u672c\u9ad8\u3001\u8106\u5f31\u800c\u4e14\u4e0d\u5b89\u5168\u3002Externalizable \u5141\u8bb8\u4f60\u63a7\u5236\u6574\u4e2a\u5e8f\u5217\u5316\u8fc7\u7a0b\uff0c\u6307\u5b9a\u7279\u5b9a\u7684\u4e8c\u8fdb\u5236\u683c\u5f0f\uff0c\u589e\u52a0\u5b89\u5168\u673a\u5236\u3002<\/p>\n

130\uff09Java \u4e2d\uff0cDOM \u548c SAX \u89e3\u6790\u5668\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f(\u7b54\u6848<\/a>)
\nDOM \u89e3\u6790\u5668\u5c06\u6574\u4e2a XML \u6587\u6863\u52a0\u8f7d\u5230\u5185\u5b58\u6765\u521b\u5efa\u4e00\u68f5 DOM \u6a21\u578b\u6811\uff0c\u8fd9\u6837\u53ef\u4ee5\u66f4\u5feb\u7684\u67e5\u627e\u8282\u70b9\u548c\u4fee\u6539 XML \u7ed3\u6784\uff0c\u800c SAX \u89e3\u6790\u5668\u662f\u4e00\u4e2a\u57fa\u4e8e\u4e8b\u4ef6\u7684\u89e3\u6790\u5668\uff0c\u4e0d\u4f1a\u5c06\u6574\u4e2a XML \u6587\u6863\u52a0\u8f7d\u5230\u5185\u5b58\u3002\u7531\u4e8e\u8fd9\u4e2a\u539f\u56e0\uff0cDOM \u6bd4 SAX \u66f4\u5feb\uff0c\u4e5f\u8981\u6c42\u66f4\u591a\u7684\u5185\u5b58\uff0c\u4e0d\u9002\u5408\u4e8e\u89e3\u6790\u5927 XML \u6587\u4ef6\u3002<\/p>\n

131\uff09\u8bf4\u51fa JDK 1.7 \u4e2d\u7684\u4e09\u4e2a\u65b0\u7279\u6027\uff1f(\u7b54\u6848<\/a>)
\n\u867d\u7136 JDK 1.7 \u4e0d\u50cf JDK 5 \u548c 8 \u4e00\u6837\u7684\u5927\u7248\u672c\uff0c\u4f46\u662f\uff0c\u8fd8\u662f\u6709\u5f88\u591a\u65b0\u7684\u7279\u6027\uff0c\u5982 try-with-resource \u8bed\u53e5\uff0c\u8fd9\u6837\u4f60\u5728\u4f7f\u7528\u6d41\u6216\u8005\u8d44\u6e90\u7684\u65f6\u5019\uff0c\u5c31\u4e0d\u9700\u8981\u624b\u52a8\u5173\u95ed\uff0cJava \u4f1a\u81ea\u52a8\u5173\u95ed\u3002Fork-Join \u6c60\u67d0\u79cd\u7a0b\u5ea6\u4e0a\u5b9e\u73b0 Java \u7248\u7684 Map-reduce\u3002\u5141\u8bb8 Switch \u4e2d\u6709 String \u53d8\u91cf\u548c\u6587\u672c\u3002\u83f1\u5f62\u64cd\u4f5c\u7b26(<>)\u7528\u4e8e\u7c7b\u578b\u63a8\u65ad\uff0c\u4e0d\u518d\u9700\u8981\u5728\u53d8\u91cf\u58f0\u660e\u7684\u53f3\u8fb9\u7533\u660e\u6cdb\u578b\uff0c\u56e0\u6b64\u53ef\u4ee5\u5199\u51fa\u53ef\u8bfb\u5199\u66f4\u5f3a\u3001\u66f4\u7b80\u6d01\u7684\u4ee3\u7801\u3002\u53e6\u4e00\u4e2a\u503c\u5f97\u4e00\u63d0\u7684\u7279\u6027\u662f\u6539\u5584\u5f02\u5e38\u5904\u7406\uff0c\u5982\u5141\u8bb8\u5728\u540c\u4e00\u4e2a catch \u5757\u4e2d\u6355\u83b7\u591a\u4e2a\u5f02\u5e38\u3002<\/p>\n

132\uff09\u8bf4\u51fa 5 \u4e2a JDK 1.8 \u5f15\u5165\u7684\u65b0\u7279\u6027\uff1f(\u7b54\u6848<\/a>)
\nJava 8 \u5728 Java \u5386\u53f2\u4e0a\u662f\u4e00\u4e2a\u5f00\u521b\u65b0\u7684\u7248\u672c\uff0c\u4e0b\u9762 JDK 8 \u4e2d 5 \u4e2a\u4e3b\u8981\u7684\u7279\u6027\uff1a
\nLambda \u8868\u8fbe\u5f0f\uff0c\u5141\u8bb8\u50cf\u5bf9\u8c61\u4e00\u6837\u4f20\u9012\u533f\u540d\u51fd\u6570
\nStream API\uff0c\u5145\u5206\u5229\u7528\u73b0\u4ee3\u591a\u6838 CPU\uff0c\u53ef\u4ee5\u5199\u51fa\u5f88\u7b80\u6d01\u7684\u4ee3\u7801
\nDate \u4e0e Time API\uff0c\u6700\u7ec8\uff0c\u6709\u4e00\u4e2a\u7a33\u5b9a\u3001\u7b80\u5355\u7684\u65e5\u671f\u548c\u65f6\u95f4\u5e93\u53ef\u4f9b\u4f60\u4f7f\u7528
\n\u6269\u5c55\u65b9\u6cd5\uff0c\u73b0\u5728\uff0c\u63a5\u53e3\u4e2d\u53ef\u4ee5\u6709\u9759\u6001\u3001\u9ed8\u8ba4\u65b9\u6cd5\u3002
\n\u91cd\u590d\u6ce8\u89e3\uff0c\u73b0\u5728\u4f60\u53ef\u4ee5\u5c06\u76f8\u540c\u7684\u6ce8\u89e3\u5728\u540c\u4e00\u7c7b\u578b\u4e0a\u4f7f\u7528\u591a\u6b21\u3002<\/p>\n

133\uff09Java \u4e2d\uff0cMaven \u548c ANT \u6709\u4ec0\u4e48\u533a\u522b\uff1f(\u7b54\u6848<\/a>)
\n\u867d\u7136\u4e24\u8005\u90fd\u662f\u6784\u5efa\u5de5\u5177\uff0c\u90fd\u7528\u4e8e\u521b\u5efa Java \u5e94\u7528\uff0c\u4f46\u662f Maven \u505a\u7684\u4e8b\u60c5\u66f4\u591a\uff0c\u5728\u57fa\u4e8e\u201c\u7ea6\u5b9a\u4f18\u4e8e\u914d\u7f6e\u201d\u7684\u6982\u5ff5\u4e0b\uff0c\u63d0\u4f9b\u6807\u51c6\u7684Java \u9879\u76ee\u7ed3\u6784\uff0c\u540c\u65f6\u80fd\u4e3a\u5e94\u7528\u81ea\u52a8\u7ba1\u7406\u4f9d\u8d56\uff08\u5e94\u7528\u4e2d\u6240\u4f9d\u8d56\u7684 JAR \u6587\u4ef6\uff09\uff0cMaven \u4e0e ANT \u5de5\u5177\u66f4\u591a\u7684\u4e0d\u540c\u4e4b\u5904\u8bf7\u53c2\u89c1\u7b54\u6848\u3002<\/p>\n

\u8fd9\u5c31\u662f\u6240\u6709\u7684\u9762\u8bd5\u9898\uff0c\u5982\u6b64\u4e4b\u591a\uff0c\u662f\u4e0d\u662f\uff1f\u6211\u53ef\u4ee5\u4fdd\u8bc1\uff0c\u5982\u679c\u4f60\u80fd\u56de\u7b54\u5217\u8868\u4e2d\u7684\u6240\u6709\u95ee\u9898\uff0c\u4f60\u5c31\u53ef\u4ee5\u5f88\u8f7b\u677e\u7684\u5e94\u4ed8\u4efb\u4f55\u6838\u5fc3 Java \u6216\u8005\u9ad8\u7ea7 Java \u9762\u8bd5\u3002\u867d\u7136\uff0c\u8fd9\u91cc\u6ca1\u6709\u6db5\u76d6 Servlet\u3001JSP\u3001JSF\u3001JPA\uff0cJMS\uff0cEJB \u53ca\u5176\u5b83 Java EE \u6280\u672f\uff0c\u4e5f\u6ca1\u6709\u5305\u542b\u4e3b\u6d41\u7684\u6846\u67b6\u5982 Spring MVC\uff0cStruts 2.0\uff0cHibernate\uff0c\u4e5f\u6ca1\u6709\u5305\u542b SOAP \u548c RESTful web service\uff0c\u4f46\u662f\u8fd9\u4efd\u5217\u8868\u5bf9\u505a Java \u5f00\u53d1\u7684\u3001\u51c6\u5907\u5e94\u8058 Java web \u5f00\u53d1\u804c\u4f4d\u7684\u4eba\u8fd8\u662f\u540c\u6837\u6709\u7528\u7684\uff0c\u56e0\u4e3a\u6240\u6709\u7684 Java \u9762\u8bd5\uff0c\u5f00\u59cb\u7684\u95ee\u9898\u90fd\u662f Java \u57fa\u7840\u548c JDK API \u76f8\u5173\u7684\u3002\u5982\u679c\u4f60\u8ba4\u4e3a\u6211\u8fd9\u91cc\u6709\u4efb\u4f55\u5e94\u8be5\u5728\u8fd9\u4efd\u5217\u8868\u4e2d\u800c\u88ab\u6211\u9057\u6f0f\u4e86\u7684 Java \u6d41\u884c\u7684\u95ee\u9898\uff0c\u4f60\u53ef\u4ee5\u81ea\u7531\u7684\u7ed9\u6211\u5efa\u8bae\u3002\u6211\u7684\u76ee\u7684\u662f\u4ece\u6700\u8fd1\u7684\u9762\u8bd5\u4e2d\u521b\u5efa\u4e00\u4efd\u6700\u65b0\u7684\u3001\u6700\u4f18\u7684 Java \u9762\u8bd5\u95ee\u9898\u5217\u8868\u3002<\/p>\n

Java EE \u76f8\u5173\u7684\u9762\u8bd5\u9898<\/h2>\n

\u4e3a\u4e86\u505a Java EE \u7684\u670b\u53cb\uff0c\u8fd9\u91cc\u5217\u51fa\u4e86\u4e00\u4e9b web \u5f00\u53d1\u7684\u7279\u5b9a\u95ee\u9898\uff0c\u4f60\u4eec\u53ef\u4ee5\u7528\u6765\u51c6\u5907 JEE \u90e8\u5206\u7684\u9762\u8bd5\uff1a<\/p>\n

10 \u5927 Spring \u6846\u67b6\u9762\u8bd5\u9898\u53ca\u7b54\u6848(\u53c2\u89c1<\/a>)
\n10 \u4e2a\u975e\u5e38\u597d\u7684 XML \u9762\u8bd5\u95ee\u9898\uff08Java \u7a0b\u5e8f\u5458\uff09(\u53c2\u89c1<\/a>)
\n20 \u4e2a\u975e\u5e38\u597d\u7684\u8bbe\u8ba1\u6a21\u5f0f\u9762\u8bd5\u95ee\u9898(\u53c2\u89c1<\/a>)
\n10\u4e2a\u6700\u6d41\u884c\u7684 Struts \u9762\u8bd5\u9898\uff08Java \u5f00\u53d1\u8005\uff09(\u53c2\u89c1<\/a>)
\n20 \u4e2a Tibco Rendezvous \u53ca EMS \u7684\u9762\u8bd5\u9898(\u66f4\u591a<\/a>)
\n10 \u4e2a\u6700\u9891\u7e41\u88ab\u95ee\u5230\u7684 Servlet \u9762\u8bd5\u95ee\u9898\u53ca\u7b54\u6848(\u53c2\u89c1<\/a>)
\n20 \u4e2a jQuery \u9762\u8bd5\u95ee\u9898\uff08Java Web \u5f00\u53d1\u8005\uff09(\u5217\u8868<\/a>)
\n10 \u4e2a\u975e\u5e38\u597d\u7684 Oracle \u9762\u8bd5\u95ee\u9898\uff08Java \u5f00\u53d1\u8005\uff09(\u53c2\u89c1<\/a>)
\n10 \u5927 \u6765\u81ea J2EE \u9762\u8bd5\u4e2d\u7684 JSP \u95ee\u9898(\u66f4\u591a<\/a>)
\n12 \u4e2a\u5f88\u597d\u7684 RESTful Web Services \u9762\u8bd5\u95ee\u9898(\u53c2\u89c1<\/a>)
\n10 \u5927 EJB \u9762\u8bd5\u95ee\u9898\u53ca\u7b54\u6848(\u53c2\u89c1<\/a>)
\n10 \u5927 JMS \u53ca MQ \u7cfb\u5217\u9762\u8bd5\u9898\u53ca\u7b54\u6848(\u5217\u8868<\/a>)
\n10 \u4e2a\u975e\u5e38\u597d Hibernate \u9762\u8bd5\u95ee\u9898\uff08Java EE \u5f00\u53d1\u8005\uff09(\u53c2\u89c1<\/a>)
\n10 \u4e2a\u975e\u5e38\u597d\u7684 JDBC \u9762\u8bd5\u9898\uff08Java \u5f00\u53d1\u8005\uff09(\u53c2\u89c1<\/a>)
\n15 \u4e2a Java NIO \u548c\u7f51\u7edc\u9762\u8bd5\u9898\u53ca\u7b54\u6848(\u53c2\u89c1<\/a>)
\n10 \u5927 XSLT \u9762\u8bd5\u9898\u53ca\u7b54\u6848(\u66f4\u591a<\/a>)
\n15 \u4e2a\u6765\u81ea Java \u9762\u8bd5\u7684\u6570\u636e\u7ed3\u6784\u548c\u7b97\u6cd5\u95ee\u9898(\u53c2\u89c1<\/a>)
\n10 \u5927 Java \u9762\u8bd5\u96be\u9898\u53ca\u7b54\u6848(\u53c2\u89c1<\/a>)
\n40 \u4e2a\u6838\u5fc3 Java \u79fb\u52a8\u5f00\u53d1\u9762\u8bd5\u9898\u53ca\u7b54\u6848(\u5217\u8868<\/a>)<\/p>\n

\u63a8\u8350\u7ed9 Java \u9762\u8bd5\u8005\u7684\u4e66\u7c4d
\n\u5982\u679c\u4f60\u6b63\u4e3a Java \u9762\u8bd5\u5bfb\u627e\u597d\u7684\u51c6\u5907\uff0c\u4f60\u53ef\u4ee5\u770b\u4e00\u4e0b\u4e0b\u9762\u7684\u4e66\u7c4d\uff0c\u8fd9\u4e9b\u4e66\u7c4d\u5305\u542b\u4e86\u7406\u8bba\u53ca\u7f16\u7801\u7684\u76f8\u5173\u95ee\u9898
\nMarkham \u7684 Java \u7f16\u7a0b\u9762\u8bd5\u63ed\u79d8(\u53c2\u89c1<\/a>)
\n\u7834\u89e3\u7f16\u7801\u9762\u8bd5\uff1a150 \u4e2a\u7f16\u7a0b\u95ee\u9898\u53ca\u89e3\u7b54(\u53c2\u89c1<\/a>)
\n\u7a0b\u5e8f\u9762\u8bd5\u63ed\u79d8\uff1a\u5bfb\u627e\u4e0b\u4e00\u4efd\u5de5\u4f5c\u7684\u79d8\u5bc6(\u53c2\u89c1<\/a>)<\/p>\n

\u539f\u6587\u94fe\u63a5\uff1a javarevisited<\/a> \u7ffb\u8bd1\uff1a ImportNew.com <\/a>– paddx<\/a>
\n<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Java \u9762\u8bd5\u968f\u7740\u65f6\u95f4\u7684\u6539\u53d8\u800c\u6539\u53d8\u3002\u5728\u8fc7\u53bb\u7684\u65e5\u5b50\u91cc\uff0c\u5f53\u4f60\u77e5\u9053 String \u548c StringBuilder \u7684 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[46],"tags":[],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/1187"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1187"}],"version-history":[{"count":2,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/1187\/revisions"}],"predecessor-version":[{"id":1684,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/1187\/revisions\/1684"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1187"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1187"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}