{"id":228730,"date":"2024-05-11T21:15:54","date_gmt":"2024-05-11T13:15:54","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/228730.html"},"modified":"2024-05-11T21:16:01","modified_gmt":"2024-05-11T13:16:01","slug":"%e6%9c%89%e5%93%aa%e4%ba%9b%e7%bb%8f%e5%85%b8%e7%9a%84-java-%e4%bb%a3%e7%a0%81%e6%8a%80%e5%b7%a7%e5%80%bc%e5%be%97%e5%ad%a6%e4%b9%a0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/228730.html","title":{"rendered":"\u6709\u54ea\u4e9b\u7ecf\u5178\u7684 Java \u4ee3\u7801\u6280\u5de7\u503c\u5f97\u5b66\u4e60"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/25151713\/19042976-b5b0-4d66-906c-d9087299e627.webp\" alt=\"\u6709\u54ea\u4e9b\u7ecf\u5178\u7684 Java \u4ee3\u7801\u6280\u5de7\u503c\u5f97\u5b66\u4e60\" \/><\/p>\n<p><p>Java\u4f5c\u4e3a\u4e00\u79cd\u6d41\u884c\u7684\u7f16\u7a0b\u8bed\u8a00\uff0c\u5176\u4ee3\u7801\u7f16\u5199\u6280\u5de7\u7684\u638c\u63e1\u5bf9\u4e8e\u7a0b\u5e8f\u5458\u800c\u8a00\u81f3\u5173\u91cd\u8981\u3002<strong>\u4f18\u79c0\u7684\u4ee3\u7801\u5e94\u7b80\u6d01\u3001\u6709\u6548\u3001\u53ef\u8bfb\u6027\u5f3a\u3001\u6613\u4e8e\u7ef4\u62a4<\/strong>\u3002\u503c\u5f97\u5b66\u4e60\u7684Java\u4ee3\u7801\u6280\u5de7\u5305\u62ec\u4f7f\u7528<strong>\u6cdb\u578b\u8fdb\u884c\u7c7b\u578b\u5b89\u5168\u7684\u7f16\u7a0b\u3001\u4f7f\u7528final\u9650\u5b9a\u4e0d\u53ef\u53d8\u7684\u53d8\u91cf\u3001\u5e94\u7528\u5b57\u7b26\u4e32\u6c60\u4ee5\u907f\u514d\u91cd\u590d\u521b\u5efa\u5b57\u7b26\u4e32\u5bf9\u8c61\u3001\u91c7\u7528\u679a\u4e3e\u63d0\u9ad8\u4ee3\u7801\u53ef\u8bfb\u6027\u4e0e\u5b89\u5168\u6027\u3001\u5229\u7528\u5f02\u5e38\u5904\u7406\u589e\u5f3a\u7a0b\u5e8f\u7684\u5065\u58ee\u6027\u3001\u8fd0\u7528\u8bbe\u8ba1\u6a21\u5f0f\u89e3\u51b3\u7279\u5b9a\u95ee\u9898\u573a\u666f<\/strong>\uff0c\u8fd9\u4e9b\u6280\u5de7\u80fd\u591f\u5e2e\u52a9\u5f00\u53d1\u8005\u63d0\u5347\u4ee3\u7801\u6548\u7387\u4e0e\u8d28\u91cf\u3002\u5176\u4e2d\uff0c\u7279\u522b\u9700\u8981\u6ce8\u610f\u7684\u662f\u4f7f\u7528<strong>\u5f02\u5e38\u5904\u7406<\/strong>\uff0c\u6b63\u786e\u7684\u5f02\u5e38\u5904\u7406\u53ef\u4ee5\u4f7f\u5f97\u7a0b\u5e8f\u5728\u9762\u5bf9\u9519\u8bef\u6216\u8005\u4e0d\u786e\u5b9a\u60c5\u51b5\u65f6\u6709\u66f4\u52a0\u9884\u671f\u7684\u884c\u4e3a\u6a21\u5f0f\uff0c\u63d0\u9ad8\u7a0b\u5e8f\u7684\u5065\u58ee\u6027\u548c\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n<\/p>\n<p><p>\u4e00\u3001\u4f7f\u7528\u6cdb\u578b\u589e\u5f3a\u7a0b\u5e8f\u7c7b\u578b\u5b89\u5168<\/p>\n<\/p>\n<p><p>Java\u63d0\u4f9b\u4e86\u6cdb\u578b\u8fd9\u4e00\u8bed\u8a00\u7279\u6027\uff0c\u5b83\u5141\u8bb8\u5728\u7f16\u8bd1\u65f6\u63d0\u4f9b\u7c7b\u578b\u68c0\u67e5\uff0c\u5e76\u6d88\u9664\u4e86\u7c7b\u578b\u8f6c\u6362\u7684\u9700\u8981\u3002\u8fd9\u4e0d\u4ec5\u53ef\u4ee5\u51cf\u5c11\u4ee3\u7801\u4e2d\u7684\u5197\u4f59\uff0c\u540c\u65f6\u4e5f\u5927\u5927\u589e\u52a0\u4e86\u7a0b\u5e8f\u7684\u7c7b\u578b\u5b89\u5168\u3002<\/p>\n<\/p>\n<p><p>\u6cdb\u578b\u4e3b\u8981\u7528\u4e8e\u96c6\u5408\u7c7b\uff0c\u53ef\u4ee5\u9650\u5b9a\u96c6\u5408\u7684\u7c7b\u578b\uff0c\u907f\u514d\u4e86\u56e0\u4e3a\u7c7b\u578b\u9519\u8bef\u5bfc\u81f4\u7684\u8fd0\u884c\u65f6\u5f02\u5e38\u3002\u4f8b\u5982\uff0c\u4f7f\u7528List\u4fdd\u8bc1\u96c6\u5408\u4e2d\u7684\u6240\u6709\u5bf9\u8c61\u90fd\u662fString\u7c7b\u578b\u3002\u5f53\u5c1d\u8bd5\u6dfb\u52a0\u975eString\u7c7b\u578b\u7684\u5bf9\u8c61\u65f6\uff0c\u7f16\u8bd1\u5668\u5c31\u4f1a\u62a5\u9519\uff0c\u9632\u6b62\u4e86\u6f5c\u5728\u7684ClassCastException\u3002<\/p>\n<\/p>\n<p><p>\u4e8c\u3001\u4f7f\u7528final\u9650\u5b9a\u4e0d\u53ef\u53d8\u53d8\u91cf<\/p>\n<\/p>\n<p><p>final\u5173\u952e\u5b57\u5728Java\u4e2d\u5177\u6709\u591a\u91cd\u610f\u4e49\uff0c\u5728\u53d8\u91cf\u524d\u4f7f\u7528final\u53ef\u4ee5\u8868\u660e\u5176\u503c\u4e00\u7ecf\u521d\u59cb\u5316\u540e\u4e0d\u53ef\u66f4\u6539\u3002\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u53d8\u91cf\uff0cfinal\u786e\u4fdd\u5176\u6570\u503c\u4e0d\u4f1a\u88ab\u6539\u53d8\uff1b\u5bf9\u4e8e\u5f15\u7528\u7c7b\u578b\u53d8\u91cf\uff0cfinal\u786e\u4fdd\u5176\u5f15\u7528\u7684\u5bf9\u8c61\u4e0d\u4f1a\u88ab\u91cd\u65b0\u8d4b\u4e88\u65b0\u7684\u5bf9\u8c61\u3002<\/p>\n<\/p>\n<p><p>\u9650\u5b9a\u53d8\u91cf\u4e3a\u4e0d\u53ef\u53d8\u6709\u4ee5\u4e0b\u597d\u5904\uff1a<\/p>\n<\/p>\n<ul>\n<li>\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\uff0c\u56e0\u4e3a\u5176\u4ed6\u4eba\u53ef\u4ee5\u6e05\u695a\u5730\u770b\u5230\u54ea\u4e9b\u53d8\u91cf\u662f\u4e0d\u4f1a\u6539\u53d8\u7684\u3002<\/li>\n<li>\u51cf\u5c11\u4e86\u51fa\u9519\u7684\u51e0\u7387\uff0c\u4e00\u65e6\u8d4b\u503c\u540e\u5c31\u4e0d\u4f1a\u88ab\u9519\u8bef\u5730\u6539\u53d8\u3002<\/li>\n<li>\u6709\u65f6\u5019\u53ef\u4ee5\u63d0\u9ad8\u7a0b\u5e8f\u6027\u80fd\uff0c\u56e0\u4e3a\u7f16\u8bd1\u5668\u53ef\u4ee5\u9488\u5bf9\u4e0d\u53ef\u53d8\u53d8\u91cf\u505a\u4f18\u5316\u5904\u7406\u3002<\/li>\n<\/ul>\n<p><p>\u4e09\u3001\u5e94\u7528\u5b57\u7b26\u4e32\u6c60<\/p>\n<\/p>\n<p><p>\u5b57\u7b26\u4e32\u6c60\u662fJava\u4e2d\u7528\u4e8e\u8282\u7701\u5185\u5b58\u548c\u63d0\u9ad8\u6027\u80fd\u7684\u7279\u6027\u3002\u5f53\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u65f6\uff0c\u6bd4\u5982String s = &quot;example&quot;\uff0cJVM\u4f1a\u9996\u5148\u68c0\u67e5\u5b57\u7b26\u4e32\u6c60\u4e2d\u662f\u5426\u6709\u76f8\u540c\u5185\u5bb9\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\u3002\u5982\u679c\u6709\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u8be5\u5bf9\u8c61\u7684\u5f15\u7528\uff1b\u5982\u679c\u6ca1\u6709\uff0c\u5219\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u5e76\u628a\u5b83\u52a0\u5165\u5230\u5b57\u7b26\u4e32\u6c60\u4e2d\u3002<\/p>\n<\/p>\n<p><p>\u8fd9\u610f\u5473\u7740\u901a\u8fc7\u4f7f\u7528\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u5f62\u5f0f\u521b\u5efa\u7684\u5b57\u7b26\u4e32\u53ef\u4ee5\u5171\u4eab\uff0c\u4ece\u800c\u51cf\u5c11\u4e86\u5185\u5b58\u7684\u5f00\u9500\u3002\u4f46\u662f\uff0c\u901a\u8fc7new String()\u521b\u5efa\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\u4e0d\u4f1a\u8fdb\u5165\u5b57\u7b26\u4e32\u6c60\u4e2d\uff0c\u9664\u975e\u624b\u52a8\u8c03\u7528intern()\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<p><p>\u56db\u3001\u91c7\u7528\u679a\u4e3e\u63d0\u5347\u4ee3\u7801\u53ef\u8bfb\u6027<\/p>\n<\/p>\n<p><p>\u679a\u4e3e\u662fJava\u8bed\u8a00\u4e2d\u7684\u4e00\u79cd\u7c7b\u578b\uff0c\u5b83\u63d0\u4f9b\u4e86\u5b9a\u4e49\u5e38\u91cf\u96c6\u5408\u7684\u4e30\u5bcc\u65b9\u5f0f\u3002\u4f7f\u7528\u679a\u4e3e\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u6613\u4e8e\u8bfb\u5199\uff0c\u56e0\u4e3a\u5b83\u4eec\u4e3a\u5e38\u91cf\u8d4b\u4e88\u4e86\u63cf\u8ff0\u6027\u7684\u540d\u5b57\uff0c\u540c\u65f6\u4e5f\u66f4\u52a0\u5b89\u5168\uff0c\u56e0\u4e3a\u679a\u4e3e\u786e\u4fdd\u4e86\u5b9e\u4f8b\u7684\u552f\u4e00\u6027\u548c\u56fa\u5b9a\u7684\u7c7b\u578b\u3002<\/p>\n<\/p>\n<p><p>\u679a\u4e3e\u53ef\u4ee5\u7528\u5728switch\u8bed\u53e5\u4e2d\uff0c\u6216\u8005\u4f5c\u4e3a\u65b9\u6cd5\u7684\u53c2\u6570\u548c\u8fd4\u56de\u7c7b\u578b\uff0c\u63d0\u4f9b\u4e86\u4e00\u79cd\u7c7b\u578b\u5b89\u5168\u7684\u9009\u9879\u3002\u53e6\u5916\uff0c\u679a\u4e3e\u8fd8\u53ef\u4ee5\u62e5\u6709\u5b57\u6bb5\u3001\u65b9\u6cd5\u548c\u6784\u9020\u51fd\u6570\uff0c\u4f7f\u5f97\u5b83\u53ef\u4ee5\u50cf\u5176\u4ed6\u7684\u7c7b\u4e00\u6837\u4e30\u5bcc\u5176\u529f\u80fd\u3002<\/p>\n<\/p>\n<p><p>\u4e94\u3001\u5229\u7528\u8bbe\u8ba1\u6a21\u5f0f\u89e3\u51b3\u7279\u5b9a\u95ee\u9898\u573a\u666f<\/p>\n<\/p>\n<p><p>\u8bbe\u8ba1\u6a21\u5f0f\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u5e38\u7528\u7684\u89e3\u51b3\u7279\u5b9a\u95ee\u9898\u7684\u65b9\u6cd5\u8bba\u3002\u4e00\u4e9b\u5e38\u7528\u7684\u8bbe\u8ba1\u6a21\u5f0f\u5305\u62ec\u5355\u4f8b\u6a21\u5f0f\u3001\u5de5\u5382\u6a21\u5f0f\u3001\u7b56\u7565\u6a21\u5f0f\u3001\u89c2\u5bdf\u8005\u6a21\u5f0f\u7b49\u3002\u6b63\u786e\u4f7f\u7528\u8bbe\u8ba1\u6a21\u5f0f\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u7075\u6d3b\u3001\u53ef\u7ef4\u62a4\u548c\u53ef\u6269\u5c55\u3002\u4f8b\u5982\uff0c\u5355\u4f8b\u6a21\u5f0f\u4fdd\u8bc1\u4e86\u4e00\u4e2a\u7c7b\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u5e76\u63d0\u4f9b\u4e86\u5168\u5c40\u8bbf\u95ee\u70b9\u3002<\/p>\n<\/p>\n<p><p>\u5b66\u4e60\u8fd9\u4e9b\u6a21\u5f0f\uff0c\u5e76\u5728\u9002\u5f53\u7684\u573a\u666f\u4e0b\u5c06\u5b83\u4eec\u5e94\u7528\u5230\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u65e2\u80fd\u63d0\u9ad8\u4ee3\u7801\u7684\u8bbe\u8ba1\u6c34\u5e73\uff0c\u4e5f\u80fd\u591f\u4f7f\u56e2\u961f\u4e4b\u95f4\u7684\u6c9f\u901a\u66f4\u52a0\u987a\u7545\uff0c\u56e0\u4e3a\u8bbe\u8ba1\u6a21\u5f0f\u63d0\u4f9b\u4e86\u4e00\u5957\u5171\u901a\u7684\u672f\u8bed\u3002<\/p>\n<\/p>\n<p><p>\u516d\u3001\u5408\u7406\u4f7f\u7528\u5f02\u5e38\u5904\u7406<\/p>\n<\/p>\n<p><p>\u5728Java\u4e2d\uff0c\u5f02\u5e38\u5904\u7406\u662f\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u673a\u5236\uff0c\u7528\u4e8e\u5904\u7406\u8fd0\u884c\u65f6\u9519\u8bef\uff0c\u786e\u4fdd\u7a0b\u5e8f\u7684\u7a33\u5b9a\u6027\u3002\u6b63\u786e\u5730\u4f7f\u7528\u5f02\u5e38\u5904\u7406\u5305\u62ec\uff1a\u4f7f\u7528try-catch\u5757\u6355\u83b7\u53ef\u80fd\u53d1\u751f\u7684\u5f02\u5e38\u3001\u5728\u9002\u5f53\u7684\u65f6\u5019\u58f0\u660e\u6216\u629b\u51fa\u5f02\u5e38\u3001\u907f\u514d\u8fc7\u591a\u7684\u4f7f\u7528catch\u8bed\u53e5\u6355\u83b7\u4e0d\u76f8\u5173\u7684\u5f02\u5e38\u3002<\/p>\n<\/p>\n<p><p>\u5408\u7406\u7684\u5f02\u5e38\u5904\u7406\u53ef\u4ee5\u4f7f\u7a0b\u5e8f\u66f4\u52a0\u5065\u58ee\uff0c\u56e0\u4e3a\u5b83\u80fd\u591f\u5904\u7406\u672a\u9884\u6599\u5230\u7684\u60c5\u51b5\uff0c\u5e76\u4e14\u63d0\u4f9b\u6062\u590d\u6216\u81f3\u5c11\u4f18\u96c5\u5730\u7ec8\u6b62\u7a0b\u5e8f\u7684\u65b9\u5f0f\u3002\u52a1\u5fc5\u660e\u667a\u5730\u9009\u62e9\u5e94\u8be5\u629b\u51fa\u8fd8\u662f\u6355\u83b7\u5f02\u5e38\uff0c\u5e76\u4e14\u5728\u6355\u83b7\u5f02\u5e38\u65f6\uff0c\u5e94\u5c3d\u53ef\u80fd\u5730\u63d0\u4f9b\u6709\u52a9\u4e8e\u95ee\u9898\u89e3\u51b3\u7684\u4fe1\u606f\u3002<\/p>\n<\/p>\n<p><p>\u603b\u7ed3\u6765\u8bf4\uff0cJava\u7684\u4ee3\u7801\u6280\u5de7\u662f\u5e7f\u6cdb\u7684\uff0c\u6d89\u53ca\u8bed\u8a00\u7279\u6027\u3001\u6027\u80fd\u4f18\u5316\u3001\u4ee3\u7801\u7ec4\u7ec7\u548c\u5f02\u5e38\u5904\u7406\u7b49\u591a\u4e2a\u65b9\u9762\u3002\u4f5c\u4e3a\u4e00\u540dJava\u5f00\u53d1\u8005\uff0c\u4e0d\u65ad\u5730\u5b66\u4e60\u548c\u5e94\u7528\u8fd9\u4e9b\u6280\u5de7\uff0c\u5c06\u6709\u52a9\u4e8e\u7f16\u5199\u51fa\u66f4\u4f18\u79c0\u3001\u66f4\u53ef\u9760\u7684\u4ee3\u7801\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>\u95ee\u9898\uff1aJava\u4ee3\u7801\u4e2d\u6709\u54ea\u4e9b\u7ecf\u5178\u7684\u6280\u5de7\u503c\u5f97\u5b66\u4e60\uff1f<\/strong><\/p>\n<ol>\n<li>\n<p><strong>\u5982\u4f55\u907f\u514d\u7a7a\u6307\u9488\u5f02\u5e38\uff1f<\/strong> 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