{"id":167,"date":"2015-04-11T11:51:32","date_gmt":"2015-04-11T03:51:32","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=167"},"modified":"2026-08-16T12:19:22","modified_gmt":"2026-08-16T04:19:22","slug":"%e5%88%9d%e5%ad%a6java%e4%bb%8e%e8%bf%99%e9%87%8c%e5%bc%80%e5%a7%8b","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=167","title":{"rendered":"\u521d\u5b66java\u4ece\u8fd9\u91cc\u5f00\u59cb"},"content":{"rendered":"
\n

\u5f88\u591a\u65b0\u624b\u5b66 Java\uff0c\u4e00\u4e0a\u6765\u5c31\u88ab”JDK\u3001JVM\u3001JRE\u3001\u73af\u5883\u53d8\u91cf\u3001\u9762\u5411\u5bf9\u8c61\u3001\u591a\u6001”\u8fd9\u4e00\u5806\u8bcd\u7838\u6655\uff0c\u4e0d\u77e5\u9053\u5148\u6293\u54ea\u5934\u3002\u8fd9\u7bc7\u6587\u7ae0\u628a Java \u5165\u95e8\u5fc5\u987b\u8fc7\u7684 18 \u4e2a\u77e5\u8bc6\u70b9\u4e32\u6210\u4e00\u6761\u7ebf\uff1a\u5148\u8ba9\u7a0b\u5e8f\u8dd1\u8d77\u6765\uff0c\u518d\u5b66\u8bed\u8a00\u57fa\u7840\uff0c\u6700\u540e\u8fdb\u5230\u9762\u5411\u5bf9\u8c61\u548c\u9ad8\u7ea7\u7279\u6027\u3002\u8ddf\u7740\u8fd9\u6761\u7ebf\u8d70\uff0c\u4f60\u4f1a\u5bf9 Java \u6709\u4e00\u4e2a\u5b8c\u6574\u800c\u4e0d\u6df7\u4e71\u7684\u9aa8\u67b6\u3002<\/p>\n

\n

\u8bf4\u660e\uff1a\u539f\u6587\u7b14\u8bb0\u91cc\u7528\u5230\u7684 J2SE\u3001J2EE\u3001J2SDK \u662f\u65e9\u671f\uff08Java 5 \u4e4b\u524d\uff09\u53eb\u6cd5\uff0c\u73b0\u5728\u5206\u522b\u5bf9\u5e94 Java SE<\/strong>\uff08\u6807\u51c6\u7248\uff09\u3001Java EE \/ Jakarta EE<\/strong>\uff08\u4f01\u4e1a\u7248\uff09\u3002\u6b63\u6587\u9996\u6b21\u51fa\u73b0\u65f6\u4f1a\u6807\u6ce8\u73b0\u4ee3\u53eb\u6cd5\uff0c\u65b9\u4fbf\u4f60\u5bf9\u7167\u8d44\u6599\u3002<\/p>\n<\/blockquote>\n

\n

\u4e00\u3001\u5148\u628a\u73af\u5883\u8dd1\u8d77\u6765<\/h2>\n

1. Java \u7a0b\u5e8f\u5f00\u53d1\u4e09\u6b65<\/h3>\n

Java \u4e0d\u662f\u5199\u5b8c\u5c31\u80fd\u76f4\u63a5\u8fd0\u884c\uff0c\u800c\u662f\u8981\u7ecf\u8fc7”\u5199 \u2192 \u7f16\u8bd1 \u2192 \u6267\u884c”\u4e09\u6b65\uff1a<\/p>\n

<\/section>\n
\u6e90\u4ee3\u7801(.java)\u00a0\u00a0--\u7f16\u8bd1(javac)-->\u00a0\u00a0\u5b57\u8282\u7801(.class)\u00a0\u00a0--\u4ea4\u7ed9\u00a0JVM\u00a0\u6267\u884c-->\u00a0\u00a0\u8fd0\u884c\u7ed3\u679c\n<\/code><\/pre>\n
    \n
  • \n
    JVM\uff08Java \u865a\u62df\u673a\uff09<\/strong>\uff1a\u8d1f\u8d23\u89e3\u91ca\u6267\u884c .class<\/code> \u5b57\u8282\u7801\u3002\u5b83\u662f Java”\u4e00\u6b21\u7f16\u5199\uff0c\u5230\u5904\u8fd0\u884c”\u7684\u5173\u952e\u2014\u2014\u4f60\u5199\u7684\u4ee3\u7801\u4e0d\u76f4\u63a5\u8dd1\u5728\u64cd\u4f5c\u7cfb\u7edf\u4e0a\uff0c\u800c\u662f\u8dd1\u5728 JVM \u4e0a\uff0c\u6240\u4ee5\u6362\u53f0\u673a\u5668\u53ea\u8981\u6709\u5bf9\u5e94 JVM \u5c31\u80fd\u8dd1\u3002<\/section>\n<\/li>\n<\/ul>\n
    2. JDK \u5bb6\u65cf\uff1a\u522b\u88ab\u540d\u5b57\u7ed5\u6655<\/h3>\n\n\n\n\n\n\n\n\n
    \u540d\u79f0<\/th>\n\u542b\u4e49<\/th>\n\u73b0\u4ee3\u53eb\u6cd5<\/th>\n<\/tr>\n<\/thead>\n
    JDK<\/td>\nJava \u5f00\u53d1\u5de5\u5177\u5305\uff08\u542b\u7f16\u8bd1\u5668\u3001\u89e3\u91ca\u5668\u3001\u7c7b\u5e93\uff09<\/td>\n\u4ecd\u53eb JDK<\/td>\n<\/tr>\n
    J2SDK \/ JDK<\/td>\nJava 2 \u6807\u51c6\u5f00\u53d1\u5de5\u5177\u5305<\/td>\nJava SE Development Kit<\/td>\n<\/tr>\n
    J2SE<\/td>\nJava 2 \u6807\u51c6\u73af\u5883<\/td>\nJava SE<\/strong>\uff08\u6807\u51c6\u7248\uff0c\u505a\u684c\u9762\/\u57fa\u7840\u5e94\u7528\uff09<\/td>\n<\/tr>\n
    J2EE<\/td>\nJ2SDK + \u7f51\u7edc\u5f00\u53d1\u7c7b\u5e93<\/td>\nJava EE \/ Jakarta EE<\/strong>\uff08\u4f01\u4e1a\u7248\uff0c\u505a Web\/\u670d\u52a1\u5668\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \u8bb0\u4f4f\u4e00\u53e5\u8bdd\uff1a\u60f3\u5199 Java \u7a0b\u5e8f\uff0c\u88c5 JDK \u5c31\u591f\u4e86<\/strong>\uff1bJ2SE\/J2EE \u53ea\u662f JDK \u6309\u7528\u9014\u5212\u5206\u7684\u7248\u672c\u3002<\/p>\n
    3. JAVA_HOME \u4e0e\u6838\u5fc3\u5de5\u5177<\/h3>\n
    \u88c5\u597d JDK \u540e\uff0c\u5173\u952e\u76ee\u5f55\u662f JAVA_HOME<\/code>\uff08JDK \u5b89\u88c5\u6839\u76ee\u5f55\uff09\uff1a<\/p>\n
      \n
    • \n
      \u7f16\u8bd1\u5668\uff1a%JAVA_HOME%\\bin\\javac.exe<\/code><\/section>\n<\/li>\n
    • \n
      \u89e3\u91ca\u5668\uff1a%JAVA_HOME%\\bin\\java.exe<\/code><\/section>\n<\/li>\n
    • \n
      \u7c7b\u5e93\uff1a\u5404\u79cd *.jar<\/code> \u6587\u4ef6<\/section>\n<\/li>\n<\/ul>\n
      4. \u7f16\u8bd1\u4e0e\u6267\u884c\u547d\u4ee4<\/h3>\n
      <\/section>\n
      #\u00a0\u7f16\u8bd1\uff1a\u628a\u00a0.java\u00a0\u53d8\u6210\u00a0.class<\/span>\njavac\u00a0Hello.java\n\n#\u00a0\u6267\u884c\uff1a\u4ea4\u7ed9\u00a0JVM\u00a0\u8dd1\uff0c\u6ce8\u610f\u3010\u4e0d\u80fd\u5e26\u00a0.class\u00a0\u540e\u7f00\u3011<\/span>\njava\u00a0Hello\n<\/code><\/pre>\n
      5. PATH \u73af\u5883\u53d8\u91cf<\/h3>\n
        \n
      • \n
        \u4f5c\u7528<\/strong>\uff1a\u544a\u8bc9\u7cfb\u7edf\u53bb\u54ea\u4e9b\u76ee\u5f55\u627e\u53ef\u6267\u884c\u6587\u4ef6\uff08\u8ba9 javac<\/code>\u3001java<\/code> \u5728\u4efb\u610f\u76ee\u5f55\u90fd\u80fd\u6572\uff09\u3002<\/section>\n<\/li>\n
      • \n
        \u683c\u5f0f<\/strong>\uff1aset path=%path%;C:\\Java\\jdk\\bin<\/code><\/section>\n<\/li>\n
      • \n
        %path%<\/code> \u4ee3\u8868\u5df2\u6709\u7684 path \u5185\u5bb9\uff1b\u67e5\u770b\u5f53\u524d\u914d\u7f6e\u76f4\u63a5\u6572 path<\/code>\u3002<\/section>\n<\/li>\n<\/ul>\n
        6. CLASSPATH \u73af\u5883\u53d8\u91cf<\/h3>\n
          \n
        • \n
          \u4f5c\u7528<\/strong>\uff1a\u544a\u8bc9 JVM \u53bb\u54ea\u4e9b\u76ee\u5f55\u627e .class<\/code> \u6587\u4ef6\uff08\u5373\u5b57\u8282\u7801\u641c\u7d22\u8def\u5f84\uff09\u3002<\/section>\n<\/li>\n
        • \n
          \u683c\u5f0f<\/strong>\uff1aset classpath=%classpath%;\u8def\u5f84<\/code><\/section>\n<\/li>\n<\/ul>\n
          \n
          \u73b0\u4ee3\u5f00\u53d1\u57fa\u672c\u7528\u6784\u5efa\u5de5\u5177\uff08Maven\/Gradle\uff09\u6216 IDE \u7ba1\u7406\u4f9d\u8d56\uff0c\u5f88\u5c11\u624b\u52a8\u914d CLASSPATH\uff0c\u4f46\u7406\u89e3\u5b83\u7684\u542b\u4e49\u80fd\u5e2e\u4f60\u6392\u67e5”\u627e\u4e0d\u5230\u7c7b”\u7684\u62a5\u9519\u3002<\/p>\n<\/blockquote>\n
          7. \u5f00\u53d1\u5de5\u5177<\/h3>\n
          \u539f\u6587\u63d0\u5230 Eclipse\u3001JBuilder\u3002\u73b0\u5728\u4e3b\u6d41\u662f\uff1a<\/p>\n
            \n
          • \n
            IntelliJ IDEA<\/strong>\uff08\u793e\u533a\u7248\u514d\u8d39\uff0c\u529f\u80fd\u5f3a\uff0c\u65b0\u624b\u9996\u9009\uff09<\/section>\n<\/li>\n
          • \n
            Eclipse<\/strong>\uff08\u8001\u724c\u514d\u8d39\uff09<\/section>\n<\/li>\n
          • \n
            \u4e5f\u53ef\u4ee5\u7528 VS Code + Java \u63d2\u4ef6<\/section>\n<\/li>\n<\/ul>\n
            \u65b0\u624b\u5efa\u8bae\u76f4\u63a5\u4e0a IntelliJ IDEA\uff0c\u81ea\u5e26\u7f16\u8bd1\u8fd0\u884c\uff0c\u4e0d\u7528\u624b\u6572\u547d\u4ee4\u4e5f\u80fd\u5b66\u3002<\/p>\n
            \n
            \u4e8c\u3001\u8bed\u8a00\u57fa\u7840<\/h2>\n
            8. \u6570\u636e\u7c7b\u578b<\/h3>\n
            \u539f\u59cb\uff08\u57fa\u672c\uff09\u6570\u636e\u7c7b\u578b<\/strong>\u2014\u20148 \u79cd\uff1a<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
            \u7c7b\u578b<\/th>\n\u8bf4\u660e<\/th>\n\u793a\u4f8b<\/th>\n<\/tr>\n<\/thead>\n
            byte<\/td>\n1 \u5b57\u8282\u6574\u6570<\/td>\nbyte b = 100;<\/code><\/td>\n<\/tr>\n
            short<\/td>\n2 \u5b57\u8282\u6574\u6570<\/td>\nshort s = 1000;<\/code><\/td>\n<\/tr>\n
            int<\/td>\n4 \u5b57\u8282\u6574\u6570\uff08\u6700\u5e38\u7528\uff09<\/td>\nint i = 100;<\/code><\/td>\n<\/tr>\n
            long<\/td>\n8 \u5b57\u8282\u6574\u6570<\/td>\nlong l = 100L;<\/code><\/td>\n<\/tr>\n
            float<\/td>\n4 \u5b57\u8282\u6d6e\u70b9<\/td>\nfloat f = 1.2f;<\/code><\/td>\n<\/tr>\n
            double<\/td>\n8 \u5b57\u8282\u6d6e\u70b9\uff08\u6700\u5e38\u7528\uff09<\/td>\ndouble d = 1.2;<\/code><\/td>\n<\/tr>\n
            char<\/td>\n\u5355\u4e2a\u5b57\u7b26<\/td>\nchar c = 'A';<\/code><\/td>\n<\/tr>\n
            boolean<\/td>\n\u5e03\u5c14\u503c<\/td>\nboolean ok = true;<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
            \u5f15\u7528\u6570\u636e\u7c7b\u578b<\/strong>\uff1a\u6570\u7ec4\u3001\u7c7b\u3001\u63a5\u53e3\uff08\u672c\u8d28\u662f”\u6307\u5411\u5bf9\u8c61\u7684\u5f15\u7528”\uff0c\u4e0d\u662f\u503c\u672c\u8eab\uff09\u3002<\/p>\n
            9. \u8fd0\u7b97\u7b26<\/h3>\n\n\n\n\n\n\n\n\n\n
            \u7c7b\u522b<\/th>\n\u4f8b\u5b50<\/th>\n<\/tr>\n<\/thead>\n
            \u7b97\u672f\u8fd0\u7b97\u7b26<\/td>\n+ - * \/ %<\/code><\/td>\n<\/tr>\n
            \u8d4b\u503c\u8fd0\u7b97\u7b26<\/td>\n= += -= *=<\/code><\/td>\n<\/tr>\n
            \u5173\u7cfb\u8fd0\u7b97\u7b26<\/td>\n> < == != >= <=<\/code><\/td>\n<\/tr>\n
            \u903b\u8f91\u8fd0\u7b97\u7b26<\/td>\n&& || !<\/code><\/td>\n<\/tr>\n
            \u6761\u4ef6\u8fd0\u7b97\u7b26\uff08\u4e09\u5143\uff09<\/td>\n\u6761\u4ef6 ? \u771f\u503c : \u5047\u503c<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
            <\/section>\n
            int<\/span>\u00a0score<\/span>\u00a0=<\/span>\u00a085<\/span>;\nString<\/span>\u00a0level<\/span>\u00a0=<\/span>\u00a0score\u00a0>=\u00a060<\/span>\u00a0?\u00a0\"\u53ca\u683c\"<\/span>\u00a0:\u00a0\"\u4e0d\u53ca\u683c\"<\/span>;\u00a0\u00a0\/\/\u00a0\u6761\u4ef6\u8fd0\u7b97\u7b26<\/span>\n<\/code><\/pre>\n
            10. \u63a7\u5236\u8bed\u53e5<\/h3>\n
            \u4e09\u7c7b\uff1a\u5224\u65ad\u3001\u5faa\u73af\u3001\u8df3\u8f6c\u3002<\/p>\n
            <\/section>\n
            \/\/\u00a0\u5224\u65ad<\/span>\nif<\/span>\u00a0(score\u00a0>=\u00a090<\/span>)\u00a0{\n\u00a0\u00a0System.out.println(\"\u4f18\u79c0\"<\/span>);\n}\u00a0else<\/span>\u00a0if<\/span>\u00a0(score\u00a0>=\u00a060<\/span>)\u00a0{\n\u00a0\u00a0System.out.println(\"\u53ca\u683c\"<\/span>);\n}\u00a0else<\/span>\u00a0{\n\u00a0\u00a0System.out.println(\"\u4e0d\u53ca\u683c\"<\/span>);\n}\n\n\/\/\u00a0\u5faa\u73af<\/span>\nfor<\/span>\u00a0(int<\/span>\u00a0i<\/span>\u00a0=<\/span>\u00a01<\/span>;\u00a0i\u00a0<=\u00a05<\/span>;\u00a0i++)\u00a0{\n\u00a0\u00a0System.out.println(\"\u7b2c\"<\/span>\u00a0+\u00a0i\u00a0+\u00a0\"\u6b21\"<\/span>);\n}\n\n\/\/\u00a0\u8df3\u8f6c<\/span>\nfor<\/span>\u00a0(int<\/span>\u00a0i<\/span>\u00a0=<\/span>\u00a00<\/span>;\u00a0i\u00a0<\u00a010<\/span>;\u00a0i++)\u00a0{\n\u00a0\u00a0if<\/span>\u00a0(i\u00a0==\u00a03<\/span>)\u00a0continue<\/span>;\u00a0\u00a0\u00a0\/\/\u00a0\u8df3\u8fc7\u672c\u6b21<\/span>\n\u00a0\u00a0if<\/span>\u00a0(i\u00a0==\u00a08<\/span>)\u00a0break<\/span>;\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u7ed3\u675f\u5faa\u73af<\/span>\n\u00a0\u00a0System.out.println(i);\n}\n<\/code><\/pre>\n
            \n
            \u4e09\u3001\u6570\u7ec4<\/h2>\n
            \u6570\u7ec4\u662f”\u540c\u4e00\u7c7b\u578b\u5143\u7d20\u7684\u96c6\u5408”\uff0c\u4e09\u79cd\u5199\u6cd5\uff1a<\/p>\n
            <\/section>\n
            int<\/span>[]\u00a0array;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u4ec5\u58f0\u660e<\/span>\nint<\/span>[]\u00a0array\u00a0=\u00a0new<\/span>\u00a0int<\/span>[5<\/span>];\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u58f0\u660e\u00a0+\u00a0\u521b\u5efa\uff08\u957f\u5ea6\u00a05\uff09<\/span>\nint<\/span>[]\u00a0array\u00a0=\u00a0{1<\/span>,\u00a02<\/span>,\u00a03<\/span>,\u00a04<\/span>,\u00a05<\/span>};\u00a0\u00a0\/\/\u00a0\u58f0\u660e\u00a0+\u00a0\u521b\u5efa\u00a0+\u00a0\u521d\u59cb\u5316<\/span>\n<\/code><\/pre>\n
            \u904d\u5386\uff1a<\/p>\n
            <\/section>\n
            for<\/span>\u00a0(int<\/span>\u00a0x\u00a0:\u00a0array)\u00a0{\n\u00a0\u00a0System.out.println(x);\n}\n<\/code><\/pre>\n
            \n
            \u56db\u3001\u9762\u5411\u5bf9\u8c61\uff08OOP \u6838\u5fc3\uff09<\/h2>\n
            11. \u5bf9\u8c61\u4e0e\u7c7b<\/h3>\n
              \n
            • \n
              \u7c7b<\/strong>\uff1a\u5bf9\u8c61\u7684”\u6a21\u677f\/\u539f\u578b”\uff0c\u5b9a\u4e49\u4e86\u4e00\u7c7b\u4e8b\u7269\u957f\u4ec0\u4e48\u6837\u3001\u80fd\u5e72\u4ec0\u4e48\u3002<\/section>\n<\/li>\n
            • \n
              \u5bf9\u8c61<\/strong>\uff1a\u7c7b\u7684\u5b9e\u4f53\uff0c\u7528 new<\/code> \u521b\u5efa\u3002<\/section>\n<\/li>\n<\/ul>\n
              <\/section>\n
              class<\/span>\u00a0Student<\/span>\u00a0{\n\u00a0\u00a0String\u00a0name;\n\u00a0\u00a0void<\/span>\u00a0study<\/span>()<\/span>\u00a0{\n\u00a0\u00a0\u00a0\u00a0System.out.println(name\u00a0+\u00a0\"\u5728\u5b66\u4e60\"<\/span>);\n\u00a0\u00a0}\n}\n\n\/\/\u00a0\u521b\u5efa\u5bf9\u8c61<\/span>\nStudent<\/span>\u00a0s<\/span>\u00a0=<\/span>\u00a0new<\/span>\u00a0Student<\/span>();\ns.name\u00a0=\u00a0\"\u5c0f\u660e\"<\/span>;\ns.study();\n<\/code><\/pre>\n
              12. \u7c7b\u7684\u5b9a\u4e49<\/h3>\n
              \u7528 class<\/code> \u5173\u952e\u5b57\u3002\u7c7b\u91cc\u5305\u542b\uff1a<\/p>\n
                \n
              • \n
                \u5c5e\u6027<\/strong>\uff08\u5b57\u6bb5\uff09<\/section>\n<\/li>\n
              • \n
                \u65b9\u6cd5<\/strong>\uff08\u884c\u4e3a\uff0c\u542b\u6784\u9020\u65b9\u6cd5\uff09<\/section>\n<\/li>\n
              • \n
                \u6784\u9020\u65b9\u6cd5<\/strong>\uff1a\u6ca1\u6709\u8fd4\u56de\u7c7b\u578b\uff0c\u540d\u5b57\u548c\u7c7b\u540d\u4e00\u6837\uff0c\u7528\u6765\u521d\u59cb\u5316\u5bf9\u8c61<\/section>\n<\/li>\n<\/ul>\n
                <\/section>\n
                class<\/span>\u00a0Student<\/span>\u00a0{\n\u00a0\u00a0String\u00a0name;\n\u00a0\u00a0int<\/span>\u00a0age;\n\n\u00a0\u00a0\/\/\u00a0\u6784\u9020\u65b9\u6cd5<\/span>\n\u00a0\u00a0Student(String\u00a0name,\u00a0int<\/span>\u00a0age)\u00a0{\n\u00a0\u00a0\u00a0\u00a0this<\/span>.name\u00a0=\u00a0name;\n\u00a0\u00a0\u00a0\u00a0this<\/span>.age\u00a0=\u00a0age;\n\u00a0\u00a0}\n\n\u00a0\u00a0\/\/\u00a0\u666e\u901a\u65b9\u6cd5\uff1a\u65b9\u6cd5\u540d\u3001\u8fd4\u56de\u503c\u7c7b\u578b(void)\u3001\u53c2\u6570\u5217\u8868\u3001\u65b9\u6cd5\u4f53<\/span>\n\u00a0\u00a0void<\/span>\u00a0sayHi<\/span>()<\/span>\u00a0{\n\u00a0\u00a0\u00a0\u00a0System.out.println(\"\u6211\u662f\"<\/span>\u00a0+\u00a0name\u00a0+\u00a0\"\uff0c\"<\/span>\u00a0+\u00a0age\u00a0+\u00a0\"\u5c81\"<\/span>);\n\u00a0\u00a0}\n}\n<\/code><\/pre>\n
                13. \u5c01\u88c5\u3001\u62bd\u8c61\u3001\u7ee7\u627f\u3001\u591a\u6001\uff08\u56db\u5927\u7279\u6027\uff09<\/h3>\n
                \u5c01\u88c5<\/strong>\uff1a\u9690\u85cf\u5185\u90e8\u7ec6\u8282\uff0c\u53ea\u66b4\u9732\u5b89\u5168\u7684\u8bbf\u95ee\u65b9\u5f0f\u3002\u9760\u4fee\u9970\u7b26\u5b9e\u73b0\uff1a<\/p>\n\n\n\n\n\n\n\n\n
                \u4fee\u9970\u7b26<\/th>\n\u8bbf\u95ee\u8303\u56f4<\/th>\n<\/tr>\n<\/thead>\n
                private<\/td>\n\u4ec5\u672c\u7c7b<\/td>\n<\/tr>\n
                \u9ed8\u8ba4\uff08\u4e0d\u5199\uff09<\/td>\n\u672c\u5305\u5185<\/td>\n<\/tr>\n
                protected<\/td>\n\u672c\u5305 + \u5916\u5305\u5b50\u7c7b<\/td>\n<\/tr>\n
                public<\/td>\n\u4efb\u4f55\u5730\u65b9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
                <\/section>\n
                class<\/span>\u00a0Student<\/span>\u00a0{\n\u00a0\u00a0private<\/span>\u00a0int<\/span>\u00a0age;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u79c1\u6709\uff0c\u5916\u90e8\u4e0d\u80fd\u76f4\u63a5\u6539<\/span>\n\n\u00a0\u00a0public<\/span>\u00a0int<\/span>\u00a0getAge<\/span>()<\/span>\u00a0{\u00a0return<\/span>\u00a0age;\u00a0}\n\u00a0\u00a0public<\/span>\u00a0void<\/span>\u00a0setAge<\/span>(int<\/span>\u00a0age)<\/span>\u00a0{\n\u00a0\u00a0\u00a0\u00a0if<\/span>\u00a0(age\u00a0>\u00a00<\/span>)\u00a0this<\/span>.age\u00a0=\u00a0age;\u00a0\u00a0\u00a0\/\/\u00a0\u5728\u00a0setter\u00a0\u91cc\u52a0\u6821\u9a8c\uff0c\u8fd9\u5c31\u662f\u5c01\u88c5\u7684\u4ef7\u503c<\/span>\n\u00a0\u00a0}\n}\n<\/code><\/pre>\n
                \u975e\u6743\u9650\u4fee\u9970\u7b26<\/strong>\u4e5f\u5e38\u7528\uff1a<\/p>\n
                  \n
                • \n
                  static<\/code>\uff1a\u9759\u6001\u6210\u5458\uff0c\u53ef\u901a\u8fc7\u7c7b\u76f4\u63a5\u8c03\u7528\uff08Student.count<\/code>\uff09\uff0c\u9759\u6001\u65b9\u6cd5\u5185\u4e0d\u80fd\u8c03\u975e\u9759\u6001\u6210\u5458\uff1b\u9759\u6001\u5757\u7528\u4e8e\u521d\u59cb\u5316\u9759\u6001\u6210\u5458\u3002<\/section>\n<\/li>\n
                • \n
                  final<\/code>\uff1afinal \u53d8\u91cf\u503c\u4e0d\u53ef\u53d8\uff08\u5e38\u91cf\uff09\uff1bfinal \u65b9\u6cd5\u4e0d\u80fd\u88ab\u91cd\u5199\uff1bfinal \u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f\u3002<\/section>\n<\/li>\n
                • \n
                  abstract<\/code>\uff1a\u62bd\u8c61\u65b9\u6cd5\u65e0\u65b9\u6cd5\u4f53\uff1b\u542b\u62bd\u8c61\u65b9\u6cd5\u7684\u7c7b\u5fc5\u987b\u662f\u62bd\u8c61\u7c7b\uff0c\u62bd\u8c61\u7c7b\u4e0d\u80fd new<\/code> \u5bf9\u8c61\uff1b\u5373\u4f7f\u6ca1\u6709\u62bd\u8c61\u65b9\u6cd5\u4e5f\u53ef\u58f0\u660e\u4e3a\u62bd\u8c61\u7c7b\u3002<\/section>\n<\/li>\n<\/ul>\n
                  \u63a5\u53e3\uff08interface\uff09<\/strong>\uff1a\u6bd4\u62bd\u8c61\u7c7b\u66f4”\u7eaf”\u7684\u62bd\u8c61\u3002<\/p>\n
                    \n
                  • \n
                    \u7528 interface<\/code> \u5b9a\u4e49\uff0cimplements<\/code> \u5b9e\u73b0<\/section>\n<\/li>\n
                  • \n
                    \u65b9\u6cd5\u9ed8\u8ba4 public\uff0c\u53ea\u6709\u58f0\u660e\u6ca1\u6709\u5b9e\u73b0<\/section>\n<\/li>\n
                  • \n
                    \u4e00\u4e2a\u7c7b\u53ef\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3<\/strong><\/section>\n<\/li>\n
                  • \n
                    \u63a5\u53e3\u53ef\u7528 extends<\/code> \u7ee7\u627f\u5176\u4ed6\u63a5\u53e3<\/section>\n<\/li>\n<\/ul>\n
                    <\/section>\n
                    interface<\/span>\u00a0Flyable<\/span>\u00a0{\n\u00a0\u00a0void<\/span>\u00a0fly<\/span>()<\/span>;\n}\nclass<\/span>\u00a0Bird<\/span>\u00a0implements<\/span>\u00a0Flyable<\/span>\u00a0{\n\u00a0\u00a0public<\/span>\u00a0void<\/span>\u00a0fly<\/span>()<\/span>\u00a0{\u00a0System.out.println(\"\u9e1f\u5728\u98de\"<\/span>);\u00a0}\n}\n<\/code><\/pre>\n
                    \u7ee7\u627f<\/strong>\uff1a\u7528 extends<\/code>\u3002<\/p>\n
                      \n
                    • \n
                      \u5b50\u7c7b\u7ee7\u627f\u7236\u7c7b\u6240\u6709\u65b9\u6cd5\u548c\u5c5e\u6027<\/section>\n<\/li>\n
                    • \n
                      \u4e0d\u7ee7\u627f\u6784\u9020\u65b9\u6cd5<\/strong><\/section>\n<\/li>\n
                    • \n
                      \u521b\u5efa\u5b50\u7c7b\u5bf9\u8c61\u65f6\uff0c\u7236\u7c7b\u6784\u9020\u65b9\u6cd5\u5148\u4e8e\u5b50\u7c7b\u8c03\u7528<\/section>\n<\/li>\n<\/ul>\n
                      <\/section>\n
                      class<\/span>\u00a0Animal<\/span>\u00a0{\n\u00a0\u00a0Animal()\u00a0{\u00a0System.out.println(\"\u52a8\u7269\u521d\u59cb\u5316\"<\/span>);\u00a0}\n}\nclass<\/span>\u00a0Dog<\/span>\u00a0extends<\/span>\u00a0Animal<\/span>\u00a0{\n\u00a0\u00a0Dog()\u00a0{\u00a0System.out.println(\"\u72d7\u521d\u59cb\u5316\"<\/span>);\u00a0}\n}\n\/\/\u00a0new\u00a0Dog()\u00a0\u4f1a\u5148\u6253\u5370\"\u52a8\u7269\u521d\u59cb\u5316\"\uff0c\u518d\u6253\u5370\"\u72d7\u521d\u59cb\u5316\"<\/span>\n<\/code><\/pre>\n
                      \u591a\u6001<\/strong>\uff1a\u540c\u4e00\u64cd\u4f5c\u4f5c\u7528\u4e0d\u540c\u5bf9\u8c61\u8868\u73b0\u4e0d\u540c\uff0c\u4e3b\u8981\u9760\uff1a<\/p>\n
                        \n
                      • \n
                        \u65b9\u6cd5\u91cd\u8f7d\uff08overload\uff09<\/strong>\uff1a\u540c\u540d\u3001\u53c2\u6570\u5217\u8868\u4e0d\u540c\uff08\u4e0d\u770b\u8fd4\u56de\u503c\uff09<\/section>\n<\/li>\n
                      • \n
                        \u65b9\u6cd5\u91cd\u5199\uff08override\uff09<\/strong>\uff1a\u5b50\u7c7b\u91cd\u65b0\u5b9a\u4e49\u7236\u7c7b\u65b9\u6cd5\u4f53<\/section>\n<\/li>\n<\/ul>\n
                        <\/section>\n
                        class<\/span>\u00a0Calc<\/span>\u00a0{\n\u00a0\u00a0int<\/span>\u00a0add<\/span>(int<\/span>\u00a0a,\u00a0int<\/span>\u00a0b)<\/span>\u00a0{\u00a0return<\/span>\u00a0a\u00a0+\u00a0b;\u00a0}\n\u00a0\u00a0double<\/span>\u00a0add<\/span>(double<\/span>\u00a0a,\u00a0double<\/span>\u00a0b)<\/span>\u00a0{\u00a0return<\/span>\u00a0a\u00a0+\u00a0b;\u00a0}\u00a0\u00a0\/\/\u00a0\u91cd\u8f7d<\/span>\n}\nclass<\/span>\u00a0Cat<\/span>\u00a0extends<\/span>\u00a0Animal<\/span>\u00a0{\n\u00a0\u00a0@Override<\/span>\n\u00a0\u00a0void<\/span>\u00a0sound<\/span>()<\/span>\u00a0{\u00a0System.out.println(\"\u55b5\"<\/span>);\u00a0}\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u91cd\u5199<\/span>\n}\n<\/code><\/pre>\n
                        \n
                        \u4e94\u3001\u5f02\u5e38\u5904\u7406<\/h2>\n
                        \u5f02\u5e38<\/strong>\uff1a\u7a0b\u5e8f\u8fd0\u884c\u65f6\u53d1\u751f\u7684\u9519\u8bef\u3002Java \u7528 try\/catch<\/code> \u4f18\u96c5\u5904\u7406\uff0c\u4e0d\u8ba9\u7a0b\u5e8f\u76f4\u63a5\u5d29\uff1a<\/p>\n
                        <\/section>\n
                        try<\/span>\u00a0{\n\u00a0\u00a0int<\/span>\u00a0r<\/span>\u00a0=<\/span>\u00a010<\/span>\u00a0\/\u00a00<\/span>;\n}\u00a0catch<\/span>\u00a0(ArithmeticException\u00a0e)\u00a0{\n\u00a0\u00a0System.out.println(\"\u9664\u96f6\u9519\u8bef\uff1a\"<\/span>\u00a0+\u00a0e.getMessage());\n}\u00a0finally<\/span>\u00a0{\n\u00a0\u00a0System.out.println(\"\u65e0\u8bba\u5bf9\u9519\u90fd\u4f1a\u6267\u884c\"<\/span>);\u00a0\u00a0\u00a0\/\/\u00a0\u8d44\u6e90\u91ca\u653e\u5e38\u653e\u8fd9\u91cc<\/span>\n}\n<\/code><\/pre>\n
                        \u56db\u79cd\u5904\u7406\u65b9\u5f0f\uff1a<\/p>\n
                          \n
                        1. \n
                          try\/catch<\/code> \u5355 catch \u6216\u591a\u91cd catch<\/section>\n<\/li>\n
                        2. \n
                          try\/catch\/finally<\/code><\/section>\n<\/li>\n
                        3. \n
                          throw<\/code>\uff08\u624b\u52a8\u629b\uff09\/throws<\/code>\uff08\u58f0\u660e\u629b\u51fa\uff09<\/section>\n<\/li>\n
                        4. \n
                          \u81ea\u5b9a\u4e49\u5f02\u5e38\u7c7b\uff08\u7ee7\u627f Exception\uff09<\/section>\n<\/li>\n<\/ol>\n
                          <\/section>\n
                          \/\/\u00a0\u81ea\u5b9a\u4e49\u5f02\u5e38<\/span>\nclass<\/span>\u00a0AgeException<\/span>\u00a0extends<\/span>\u00a0Exception<\/span>\u00a0{\n\u00a0\u00a0AgeException(String\u00a0msg)\u00a0{\u00a0super<\/span>(msg);\u00a0}\n}\n\/\/\u00a0\u4f7f\u7528<\/span>\nif<\/span>\u00a0(age\u00a0<\u00a00<\/span>)\u00a0throw<\/span>\u00a0new<\/span>\u00a0AgeException<\/span>(\"\u5e74\u9f84\u4e0d\u80fd\u4e3a\u8d1f\"<\/span>);\n<\/code><\/pre>\n
                          \n
                          \u516d\u3001\u5305\uff08package\uff09<\/h2>\n
                          \u5305\u7528\u6765\u7ec4\u7ec7\u7c7b\u3001\u907f\u514d\u547d\u540d\u51b2\u7a81\uff0c\u7c7b\u4f3c\u6587\u4ef6\u5939\u3002<\/p>\n
                          <\/section>\n
                          package<\/span>\u00a0com.zhou.demo;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u58f0\u660e\u5305\uff08\u6587\u4ef6\u7b2c\u4e00\u884c\uff09<\/span>\n\nimport<\/span>\u00a0com.zhou.util.Tools;\u00a0\u00a0\u00a0\/\/\u00a0\u5bfc\u5165\u6307\u5b9a\u7c7b<\/span>\nimport<\/span>\u00a0com.zhou.util.*;\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u5bfc\u5165\u5305\u4e0b\u6240\u6709\u00a0public\u00a0\u7c7b<\/span>\n<\/code><\/pre>\n
                          \u7f16\u8bd1\u5e26\u5305\u7684\u6587\u4ef6\u8981\u6307\u5b9a\u8f93\u51fa\u76ee\u5f55\uff1a<\/p>\n
                          <\/section>\n
                          javac\u00a0-d\u00a0.\u00a0Demo.java\u00a0\u00a0\u00a0\u00a0#\u00a0.\u00a0\u8868\u793a\u5f53\u524d\u76ee\u5f55\uff0c\u81ea\u52a8\u6309\u5305\u540d\u5efa\u5b50\u76ee\u5f55<\/span>\njava\u00a0com.zhou.demo.Demo\u00a0\u00a0\u00a0#\u00a0\u6267\u884c\u65f6\u5199\u00a0\u5305\u540d.\u7c7b\u540d<\/span>\n<\/code><\/pre>\n
                          \u5e38\u7528\u5305\uff1ajava.lang<\/code>\uff08\u57fa\u7840\u7c7b\uff0c\u81ea\u52a8\u5bfc\u5165\uff09\u3001java.util<\/code>\uff08\u96c6\u5408\u7b49\u5de5\u5177\uff09\u3001java.io<\/code>\uff08\u8f93\u5165\u8f93\u51fa\uff09\u3002<\/p>\n
                          \n
                          \u4e03\u3001\u8f93\u5165\u8f93\u51fa I\/O<\/h2>\n
                          Java \u7528”\u6d41”\u5904\u7406\u8f93\u5165\u8f93\u51fa\u3002java.io<\/code> \u5305\u4e0b\u8bfb\u6587\u672c\u6587\u4ef6\u793a\u4f8b\uff1a<\/p>\n
                          <\/section>\n
                          import<\/span>\u00a0java.io.*;\nimport<\/span>\u00a0java.nio.file.*;\n\npublic<\/span>\u00a0class<\/span>\u00a0ReadFile<\/span>\u00a0{\n\u00a0\u00a0public<\/span>\u00a0static<\/span>\u00a0void<\/span>\u00a0main<\/span>(String[]\u00a0args)<\/span>\u00a0throws<\/span>\u00a0IOException\u00a0{\n\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u73b0\u4ee3\u7b80\u6d01\u5199\u6cd5\uff08Java\u00a07+\uff09<\/span>\n\u00a0\u00a0\u00a0\u00a0String<\/span>\u00a0content<\/span>\u00a0=<\/span>\u00a0new<\/span>\u00a0String<\/span>(Files.readAllBytes(Paths.get(\"test.txt\"<\/span>)));\n\u00a0\u00a0\u00a0\u00a0System.out.println(content);\n\u00a0\u00a0}\n}\n<\/code><\/pre>\n
                          \u4f20\u7edf\u5199\u6cd5\u662f\u7528 FileInputStream<\/code> \/ BufferedReader<\/code> \u7b49\uff0c\u7406\u89e3”\u6d41”\u7684\u6982\u5ff5\u5373\u53ef\uff0c\u5b9e\u6218\u4e2d\u6309\u9700\u67e5\u6587\u6863\u3002<\/p>\n
                          \n
                          \u516b\u3001\u5e76\u53d1\u4e0e\u591a\u7ebf\u7a0b<\/h2>\n
                          \u5355\u7ebf\u7a0b\u50cf\u4e00\u6761\u6d41\u6c34\u7ebf\uff0c\u591a\u7ebf\u7a0b\u8ba9\u7a0b\u5e8f”\u540c\u65f6”\u505a\u51e0\u4ef6\u4e8b\uff08\u5982\u4e00\u8fb9\u4e0b\u8f7d\u4e00\u8fb9\u5237\u65b0\u754c\u9762\uff09\u3002Java \u521b\u5efa\u7ebf\u7a0b\u4e24\u79cd\u4e3b\u6d41\u65b9\u5f0f\uff1a<\/p>\n
                          <\/section>\n
                          \/\/\u00a0\u65b9\u5f0f\u4e00\uff1a\u7ee7\u627f\u00a0Thread<\/span>\nclass<\/span>\u00a0MyThread<\/span>\u00a0extends<\/span>\u00a0Thread<\/span>\u00a0{\n\u00a0\u00a0public<\/span>\u00a0void<\/span>\u00a0run<\/span>()<\/span>\u00a0{\u00a0System.out.println(\"\u7ebf\u7a0b\u8fd0\u884c\u4e2d\"<\/span>);\u00a0}\n}\nnew<\/span>\u00a0MyThread<\/span>().start();\n\n\/\/\u00a0\u65b9\u5f0f\u4e8c\uff1a\u5b9e\u73b0\u00a0Runnable\uff08\u66f4\u63a8\u8350\uff0c\u907f\u514d\u5355\u7ee7\u627f\u9650\u5236\uff09<\/span>\nclass<\/span>\u00a0MyTask<\/span>\u00a0implements<\/span>\u00a0Runnable<\/span>\u00a0{\n\u00a0\u00a0public<\/span>\u00a0void<\/span>\u00a0run<\/span>()<\/span>\u00a0{\u00a0System.out.println(\"\u4efb\u52a1\u8fd0\u884c\u4e2d\"<\/span>);\u00a0}\n}\nnew<\/span>\u00a0Thread<\/span>(new<\/span>\u00a0MyTask<\/span>()).start();\n<\/code><\/pre>\n
                          \u591a\u7ebf\u7a0b\u6d89\u53ca\u7ebf\u7a0b\u5b89\u5168\u3001\u9501\u7b49\u8fdb\u9636\u8bdd\u9898\uff0c\u5165\u95e8\u9636\u6bb5\u5148\u7406\u89e3”\u7ebf\u7a0b\u662f\u4ec0\u4e48\u3001\u600e\u4e48\u542f\u52a8”\u5c31\u591f\u4e86\u3002<\/p>\n
                          \n
                          \u4e5d\u3001\u4e0b\u4e00\u6b65\u53bb\u54ea<\/h2>\n
                          \u8d70\u5b8c\u4e0a\u9762 18 \u7ad9\uff0c\u4f60\u5df2\u7ecf\u6709\u4e86 Java \u7684\u5b8c\u6574\u9aa8\u67b6\u3002\u540e\u7eed\u5efa\u8bae\u8def\u7ebf\uff1a<\/p>\n\n\n\n\n\n\n\n\n
                          \u9636\u6bb5<\/th>\n\u5185\u5bb9<\/th>\n<\/tr>\n<\/thead>\n
                          \u5de9\u56fa\u57fa\u7840<\/td>\n\u591a\u505a\u5c0f\u7ec3\u4e60\uff1a\u8ba1\u7b97\u5668\u3001\u5b66\u751f\u7ba1\u7406\u3001\u6587\u4ef6\u6279\u91cf\u6539\u540d<\/td>\n<\/tr>\n
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