{"id":138,"date":"2015-04-02T15:15:18","date_gmt":"2015-04-02T07:15:18","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=138"},"modified":"2026-08-18T12:09:27","modified_gmt":"2026-08-18T04:09:27","slug":"138","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=138","title":{"rendered":"Java\u6d41\u7a0b\u63a7\u5236\u8bed\u53e5"},"content":{"rendered":"
\n

Java \u7a0b\u5e8f\u9760\u63a7\u5236\u8bed\u53e5<\/strong>\u8c03\u5ea6\u7a0b\u5e8f\u6d41\uff1a\u8bed\u53e5\u53ef\u4ee5\u662f\u5355\u72ec\u4e00\u6761\uff08\u5982 c = a + b<\/code>\uff09\uff0c\u4e5f\u53ef\u4ee5\u662f\u82b1\u62ec\u53f7\u5305\u8d77\u6765\u7684\u590d\u5408\u8bed\u53e5\u3002\u8bed\u53e5\u5757\u53ef\u4ee5\u5d4c\u5957\uff0c\u5c42\u6570\u4e0d\u9650\u3002<\/p>\n

\u5b9a\u4e49\u7c7b\u65f6\u7c7b\u4f53\u5fc5\u987b\u7528\u8bed\u53e5\u5757\uff1b\u5b9a\u4e49\u65b9\u6cd5\u65f6\u65b9\u6cd5\u4f53\u4e5f\u5fc5\u987b\u7528\u8bed\u53e5\u5757\u3002<\/p>\n

<\/p>\n\n\n\n\n\n\n\n\n
\u7c7b\u522b<\/th>\n\u8bed\u53e5<\/th>\n\u8981\u70b9<\/th>\n<\/tr>\n<\/thead>\n
\u8868\u8fbe\u5f0f<\/td>\n\u8d4b\u503c\u3001\u8c03\u7528\u3001new\u3001\u58f0\u660e\u3001\u81ea\u589e<\/td>\n\u8868\u8fbe\u5f0f\u6709\u8fd4\u56de\u503c<\/td>\n<\/tr>\n
\u5206\u652f<\/td>\nif \/ if-else \/ else if \/ switch<\/td>\n\u6309\u6761\u4ef6\u9009\u8def<\/td>\n<\/tr>\n
\u5faa\u73af<\/td>\nwhile \/ do-while \/ for<\/td>\n\u5faa\u73af\u4f53\u91cc\u5fc5\u987b\u6539\u6761\u4ef6\uff0c\u5426\u5219\u6b7b\u5faa\u73af<\/td>\n<\/tr>\n
\u8df3\u8f6c<\/td>\nbreak \/ continue \/ return<\/td>\n\u6253\u65ad\u3001\u8df3\u8fc7\u672c\u6b21\u3001\u9000\u51fa\u65b9\u6cd5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e00\u3001\u8868\u8fbe\u5f0f\u8bed\u53e5<\/h2>\n

\u8868\u8fbe\u5f0f\u7531\u8fd0\u7b97\u7b26\u3001\u64cd\u4f5c\u6570\u548c\u51fd\u6570\u7ec4\u6210\uff0c\u7279\u70b9\u662f\u6709\u8fd4\u56de\u503c\u3002\u8fd4\u56de\u503c\u7c7b\u578b\u53d6\u51b3\u4e8e\u64cd\u4f5c\u6570\u548c\u8fd0\u7b97\u7c7b\u578b\u3002\u5e38\u89c1\u8868\u8fbe\u5f0f\u8bed\u53e5\uff1a\u8d4b\u503c\u3001\u65b9\u6cd5\u8c03\u7528\u3001\u5bf9\u8c61\u521b\u5efa\u3001\u53d8\u91cf\u58f0\u660e\u3001\u81ea\u589e\u3002<\/p>\n

\u4e8c\u3001\u5206\u652f\u8bed\u53e5<\/h2>\n

\u5206\u652f\u6309\u6761\u4ef6\u6267\u884c\u6216\u8df3\u8fc7\u4e00\u6bb5\u4ee3\u7801\u3002Java \u91cc\u6709 if\u3001if-else\u3001if-else if\u3001switch\u3002<\/p>\n

if \/ if-else \/ else if<\/h3>\n
if (\u8868\u8fbe\u5f0f) {\n    \u8bed\u53e5\n}\n\nif (\u8868\u8fbe\u5f0f) {\n    \u8bed\u53e51;\n} else {\n    \u8bed\u53e52;\n}\n\nif (\u6761\u4ef61) {\n    \/\/ \u7a0b\u5e8f\u4ee3\u7801\n} else if (\u6761\u4ef62) {\n    \/\/ \u7a0b\u5e8f\u4ee3\u7801\n} else if (\u6761\u4ef63) {\n    \/\/ \u7a0b\u5e8f\u4ee3\u7801\n}<\/code><\/pre>\n
if \u5148\u7b97\u8868\u8fbe\u5f0f\uff0c\u771f\u5219\u6267\u884c\u8bed\u53e5\uff0c\u5426\u5219\u8df3\u8fc7\u3002if-else \u5047\u65f6\u8d70 else\u3002else if \u53ea\u8981\u524d\u9762\u6709\u4e00\u4e2a\u6761\u4ef6\u6210\u7acb\uff0c\u540e\u9762\u7684\u5c31\u4e0d\u518d\u5224\u65ad\u3002\u7ec3\u4e60\uff1a\u6bd4\u4e24\u4e2a\u6570\u7684\u6700\u5927\u503c\uff1b\u5224\u65ad\u95f0\u5e74\uff08\u80fd\u88ab 4 \u6574\u9664\u4f46\u4e0d\u80fd\u88ab 100 \u6574\u9664\uff0c\u6216\u80fd\u88ab 400 \u6574\u9664\uff09\uff1b\u7528 random()<\/code> \u4ea7\u751f\u4e00\u4e2a\u5b57\u7b26\uff0c\u5224\u65ad\u5927\u5199\u3001\u5c0f\u5199\u3001\u6570\u5b57\u8fd8\u662f\u5176\u4ed6\u7b26\u53f7\u3002<\/p>\n
if \u53ef\u4ee5\u5d4c\u5957\uff1a\u5916\u5c42\u6761\u4ef6\u6210\u7acb\u518d\u8fdb\u5185\u5c42 if-else\u3002<\/p>\n
switch<\/h3>\n
\u5148\u7b97\u8868\u8fbe\u5f0f\uff0c\u518d\u627e\u5339\u914d\u7684 case\u3002\u65e9\u671f\u53ea\u5141\u8bb8 int<\/code> \/ byte<\/code> \/ char<\/code> \/ short<\/code>\uff08\u4ee5\u53ca\u5b83\u4eec\u7684\u5305\u88c5\u7c7b\u578b\uff09\uff1b\u540e\u6765\u8fd8\u652f\u6301\u679a\u4e3e\u548c String\u3002<\/p>\n
switch (\u8868\u8fbe\u5f0f) {\n    case \u503c1:\n        \u8bed\u53e51;\n        break;\n    case \u503c2:\n        \u8bed\u53e52;\n        break;\n    default:\n        \u8bed\u53e5N;\n}<\/code><\/pre>\n
    \n
  • \n
    case \u7684\u503c\u5fc5\u987b\u662f\u5e38\u91cf\uff0c\u4e14\u4e92\u4e0d\u76f8\u540c\u3002<\/section>\n<\/li>\n
  • \n
    default \u53ef\u9009\u3002<\/section>\n<\/li>\n
  • \n
    break \u7528\u6765\u8df3\u51fa switch\uff1b\u591a\u4e2a case \u8981\u6267\u884c\u540c\u4e00\u7ec4\u64cd\u4f5c\u65f6\u53ef\u4ee5\u6545\u610f\u4e0d\u5199 break\uff08\u4f1a\u7a7f\u900f\u5230\u4e0b\u4e00\u4e2a break\uff09\u3002<\/section>\n<\/li>\n<\/ul>\n
    \u7ec3\u4e60\uff1a\u8f93\u5165\u767e\u5206\u6210\u7ee9\uff0c\u8f93\u51fa\u7b49\u7ea7\u3002<\/p>\n
    \u4e09\u3001\u5faa\u73af\u8bed\u53e5<\/h2>\n
    \u5faa\u73af\u53cd\u590d\u6267\u884c\u4e00\u6bb5\u4ee3\u7801\uff0c\u76f4\u5230\u7ec8\u6b62\u6761\u4ef6\u6210\u7acb\u3002Java \u63d0\u4f9b while\u3001do-while\u3001for\u3002<\/p>\n
    while (\u6761\u4ef6) {\n    \/\/ \u5faa\u73af\u4f53\n}\n\ndo {\n    \/\/ \u5faa\u73af\u4f53\n} while (\u6761\u4ef6);\n\nfor (\u8bbe\u5b9a\u521d\u59cb\u503c; \u6761\u4ef6\u9650\u5b9a; \u4fee\u6539\u63a7\u5236\u53d8\u91cf) {\n    \/\/ \u7a0b\u5e8f\u4ee3\u7801\n}<\/code><\/pre>\n
    while \u5148\u5224\u65ad\u518d\u6267\u884c\uff1b\u6761\u4ef6\u4e3a true \u624d\u8fdb\u5faa\u73af\u4f53\uff0c\u5faa\u73af\u4f53\u91cc\u5fc5\u987b\u6709\u6539\u53d8\u6761\u4ef6\u7684\u8bed\u53e5\uff0c\u5426\u5219\u6b7b\u5faa\u73af\u3002do-while \u5148\u6267\u884c\u4e00\u6b21\u518d\u5224\u65ad\uff0c\u56e0\u6b64\u81f3\u5c11\u6267\u884c\u4e00\u6b21\u3002for \u628a\u521d\u503c\u3001\u6761\u4ef6\u548c\u66f4\u65b0\u5199\u5728\u4e00\u8d77\u3002\u7ec3\u4e60\uff1a\u8f93\u51fa 1\uff5e100 \u5185\u524d 5 \u4e2a\u80fd\u88ab 3 \u6574\u9664\u7684\u6570\u3002<\/p>\n
    \u56db\u3001\u8df3\u8f6c\u8bed\u53e5<\/h2>\n
    break<\/code> \u7ec8\u6b62\u67d0\u4e2a\u8bed\u53e5\u5757\uff0c\u7528\u5728\u5faa\u73af\u91cc\u53ef\u4ee5\u5f3a\u884c\u9000\u51fa\uff1bcontinue<\/code> \u7ed3\u675f\u672c\u6b21\u5faa\u73af\uff0c\u8df3\u8fc7\u540e\u9762\u672a\u6267\u884c\u7684\u90e8\u5206\uff0c\u8fdb\u5165\u4e0b\u4e00\u6b21\uff1breturn<\/code> \u4ece\u5f53\u524d\u65b9\u6cd5\u9000\u51fa\uff0c\u56de\u5230\u8c03\u7528\u5904\u7ee7\u7eed\u6267\u884c\u3002<\/p>\n
    return \u6709\u4e24\u79cd\u5f62\u5f0f\uff1areturn expression;<\/code> \u548c return;<\/code>\u3002\u901a\u5e38\u5199\u5728\u65b9\u6cd5\u4f53\u6700\u540e\uff0c\u5426\u5219\u4f1a\u7f16\u8bd1\u9519\u8bef\uff0c\u9664\u975e\u653e\u5728 if-else \u91cc\u4fdd\u8bc1\u6bcf\u6761\u8def\u5f84\u90fd\u80fd\u8fd4\u56de\u3002<\/p>\n
    \n
    \u4e00\u53e5\u8bdd\u603b\u7ed3\uff1a\u8868\u8fbe\u5f0f\u8d1f\u8d23\u7b97\uff0cif\/switch \u8d1f\u8d23\u9009\u8def\uff0cwhile\/for\/do-while \u8d1f\u8d23\u91cd\u590d\uff0cbreak\/continue\/return \u8d1f\u8d23\u4e2d\u9014\u6539\u9053\uff1b\u5faa\u73af\u4f53\u91cc\u4e00\u5b9a\u8981\u6539\u6761\u4ef6\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
    Java \u7a0b\u5e8f\u9760\u63a7\u5236\u8bed\u53e5\u8c03\u5ea6\u7a0b\u5e8f\u6d41\uff1a\u8bed\u53e5\u53ef\u4ee5\u662f\u5355\u72ec\u4e00\u6761\uff08\u5982 c = a + b\uff09\uff0c\u4e5f\u53ef\u4ee5\u662f\u82b1\u62ec\u53f7\u5305\u8d77\u6765\u7684\u590d\u5408\u8bed […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[15],"tags":[30],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/138"}],"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=138"}],"version-history":[{"count":3,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/138\/revisions"}],"predecessor-version":[{"id":1500,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/138\/revisions\/1500"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=138"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=138"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=138"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}