{"id":64167,"date":"2026-01-22T21:33:30","date_gmt":"2026-01-22T13:33:30","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/64167.html"},"modified":"2026-01-22T21:33:30","modified_gmt":"2026-01-22T13:33:30","slug":"2026%e5%b9%b4%e6%b6%89%e5%8f%8a%e4%ba%92%e8%81%94%e7%bd%91%e5%a4%a7%e5%8e%82%e5%b8%b8%e8%a7%81%e7%9a%84java%e5%b2%97%e9%9d%a2%e8%af%95%e5%85%ab%e8%82%a1%e6%96%87","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/64167.html","title":{"rendered":"2026\u5e74\u6d89\u53ca\u4e92\u8054\u7f51\u5927\u5382\u5e38\u89c1\u7684Java\u5c97\u9762\u8bd5\u516b\u80a1\u6587"},"content":{"rendered":"

\u00a0\u4e00\u3001\u57fa\u7840\u7bc7 1\u3001\u9762\u5411\u5bf9\u8c61\u548c\u9762\u5411\u8fc7\u7a0b\u7684\u533a\u522b \u9762\u5411\u8fc7\u7a0b：\u662f\u5206\u6790\u89e3\u51b3\u95ee\u9898\u7684\u6b65\u9aa4，\u7136\u540e\u7528\u51fd\u6570\u628a\u8fd9\u4e9b\u6b65\u9aa4\u4e00\u6b65\u4e00\u6b65\u5730\u5b9e\u73b0，\u7136\u540e\u5728\u4f7f\u7528\u7684\u65f6\u5019\u4e00 \u4e00\u8c03\u7528\u5219\u53ef\u3002\u6027\u80fd\u8f83\u9ad8，\u6240\u4ee5\u5355\u7247\u673a\u3001\u5d4c\u5165\u5f0f\u5f00\u53d1\u7b49\u4e00\u822c\u91c7\u7528\u9762\u5411\u8fc7\u7a0b\u5f00\u53d1.<\/p>\n

\u9762\u5411\u5bf9\u8c61：\u662f\u628a\u6784\u6210\u95ee\u9898\u7684\u4e8b\u52a1\u5206\u89e3\u6210\u5404\u4e2a\u5bf9\u8c61，\u800c\u5efa\u7acb\u5bf9\u8c61\u7684\u76ee\u7684\u4e5f\u4e0d\u662f\u4e3a\u4e86\u5b8c\u6210\u4e00\u4e2a\u4e2a\u6b65\u9aa4， \u800c\u662f\u4e3a\u4e86\u63cf\u8ff0\u67d0\u4e2a\u4e8b\u7269\u5728\u89e3\u51b3\u6574\u4e2a\u95ee\u9898\u7684\u8fc7\u7a0b\u4e2d\u6240\u53d1\u751f\u7684\u884c\u4e3a\u3002\u9762\u5411\u5bf9\u8c61\u6709\u5c01\u88c5\u3001\u7ee7\u627f\u3001\u591a\u6001\u7684\u7279 \u6027，\u6240\u4ee5\u6613\u7ef4\u62a4\u3001\u6613\u590d\u7528\u3001\u6613\u6269\u5c55\u3002\u53ef\u4ee5\u8bbe\u8ba1\u51fa\u4f4e\u8026\u5408\u7684\u7cfb\u7edf\u3002 \u00a0 \u4f46\u662f\u6027\u80fd\u4e0a\u6765\u8bf4，\u6bd4\u9762\u5411\u8fc7\u7a0b\u8981\u4f4e\u3002<\/p>\n

2\u3001\u7b80\u5355\u8bf4\u8bf4\u5c01\u88c5\u3001\u7ee7\u627f\u4e0e\u591a\u6001 \u5c01\u88c5：<\/p>\n

\u6982\u5ff5：\u5c01\u88c5\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u7684\u4e00\u79cd\u57fa\u672c\u601d\u60f3\u3002\u5b83\u5c06\u5bf9\u8c61\u7684\u6570\u636e（\u5c5e\u6027）\u548c\u64cd\u4f5c\u6570\u636e\u7684\u65b9\u6cd5（\u884c\u4e3a）\u6346\u7ed1\u5728\u4e00\u8d77，\u5f62\u6210\u4e00\u4e2a\u72ec\u7acb\u7684\u5bf9\u8c61（\u7c7b）\u3002\u540c\u65f6，\u5c01\u88c5\u53ef\u4ee5\u9690\u85cf\u5bf9\u8c61\u7684\u5185\u90e8\u5b9e\u73b0\u7ec6\u8282，\u53ea\u5bf9\u5916\u63d0\u4f9b\u6709\u9650\u7684\u63a5\u53e3\u4f9b\u5176\u4ed6\u5bf9\u8c61\u8bbf\u95ee\u3002<\/p>\n

\u7ee7\u627f：<\/p>\n

\u6982\u5ff5：\u7ee7\u627f\u662f\u4e00\u79cd\u5141\u8bb8\u65b0\u7c7b（\u5b50\u7c7b）\u7ee7\u627f\u73b0\u6709\u7c7b（\u7236\u7c7b）\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u7684\u673a\u5236\u3002\u5b50\u7c7b\u53ef\u4ee5\u7ee7\u627f\u7236\u7c7b\u7684\u516c\u5171\u5c5e\u6027\u548c\u65b9\u6cd5，\u5e76\u4e14\u53ef\u4ee5\u6dfb\u52a0\u81ea\u5df1\u7684\u65b0\u5c5e\u6027\u548c\u65b9\u6cd5，\u4e5f\u53ef\u4ee5\u91cd\u5199\u7236\u7c7b\u7684\u65b9\u6cd5\u6765\u5b9e\u73b0\u7279\u5b9a\u7684\u529f\u80fd\u3002<\/p>\n

\u591a\u6001：<\/p>\n

\u6982\u5ff5：\u591a\u6001\u662f\u6307\u5141\u8bb8\u4e0d\u540c\u7684\u5bf9\u8c61\u5bf9\u540c\u4e00\u6d88\u606f\u505a\u51fa\u54cd\u5e94，\u5177\u4f53\u8c03\u7528\u54ea\u4e2a\u5bf9\u8c61\u7684\u65b9\u6cd5\u5728\u8fd0\u884c\u65f6\u6839\u636e\u5bf9\u8c61\u7684\u5b9e\u9645\u7c7b\u578b\u52a8\u6001\u786e\u5b9a\u3002\u591a\u6001\u5206\u4e3a\u7f16\u8bd1\u65f6\u591a\u6001（\u65b9\u6cd5\u91cd\u8f7d）\u548c\u8fd0\u884c\u65f6\u591a\u6001（\u65b9\u6cd5\u8986\u76d6）\u3002<\/p>\n

\u4e3e\u4f8b：\u8fd8\u662f\u4ee5\u52a8\u7269\u7c7b\u4e3a\u4f8b\u3002\u52a8\u7269\u7c7b\u6709\u4e00\u4e2a\u53eb\u7684\u65b9\u6cd5（void call()）\u3002\u72d7\u7c7b\u548c\u732b\u7c7b\u90fd\u7ee7\u627f\u81ea\u52a8\u7269\u7c7b，\u5e76\u4e14\u90fd\u8986\u76d6\u4e86\u53eb\u7684\u65b9\u6cd5\u3002\u72d7\u7c7b\u7684\u53eb\u65b9\u6cd5\u662f\u6c6a\u6c6a\u53eb，\u732b\u7c7b\u7684\u53eb\u65b9\u6cd5\u662f\u55b5\u55b5\u53eb\u3002\u5f53\u6709\u4e00\u4e2a\u52a8\u7269\u7c7b\u578b\u7684\u5f15\u7528\u6307\u5411\u72d7\u5bf9\u8c61\u65f6，\u8c03\u7528animal.call()\u5c31\u4f1a\u53d1\u51fa\u6c6a\u6c6a\u7684\u53eb\u58f0；\u5f53\u8fd9\u4e2a\u5f15\u7528\u6307\u5411\u732b\u5bf9\u8c61\u65f6，\u8c03\u7528animal.call()\u5c31\u4f1a\u53d1\u51fa\u55b5\u55b5\u7684\u53eb\u58f0\u3002\u8fd9\u5c31\u662f\u8fd0\u884c\u65f6\u591a\u6001，\u5177\u4f53\u8c03\u7528\u54ea\u4e2a\u7c7b\u7684\u53eb\u65b9\u6cd5\u662f\u5728\u8fd0\u884c\u65f6\u6839\u636e\u5bf9\u8c61\u7684\u5b9e\u9645\u7c7b\u578b（\u72d7\u6216\u732b）\u52a8\u6001\u786e\u5b9a\u7684\u3002<\/p>\n

3\u3001\u6807\u8bc6\u7b26\u7684\u547d\u540d\u89c4\u5219 \u6807\u8bc6\u7b26\u7684\u542b\u4e49： \u00a0\u662f\u6307\u5728\u7a0b\u5e8f\u4e2d，\u6211\u4eec\u81ea\u5df1\u5b9a\u4e49\u7684\u5185\u5bb9，\u8b6c\u5982，\u7c7b\u7684\u540d\u5b57，\u65b9\u6cd5\u540d\u79f0\u4ee5\u53ca\u53d8\u91cf\u540d\u79f0\u7b49 \u7b49，\u90fd\u662f\u6807\u8bc6\u7b26\u3002<\/p>\n

\u547d\u540d\u89c4\u5219：（\u786c\u6027\u8981\u6c42） \u00a0\u6807\u8bc6\u7b26\u53ef\u4ee5\u5305\u542b\u82f1\u6587\u5b57\u6bcd，0-9\u7684\u6570\u5b57，$\u4ee5\u53ca_ \u6807\u8bc6\u7b26\u4e0d\u80fd\u4ee5\u6570\u5b57\u5f00\u5934 \u6807 \u8bc6\u7b26\u4e0d\u662f\u5173\u952e\u5b57<\/p>\n

\u547d\u540d\u89c4\u8303：（\u975e\u786c\u6027\u8981\u6c42） \u00a0\u7c7b\u540d\u89c4\u8303：\u9996\u5b57\u7b26\u5927\u5199，\u540e\u9762\u6bcf\u4e2a\u5355\u8bcd\u9996\u5b57\u6bcd\u5927\u5199（\u5927\u9a7c\u5cf0\u5f0f）\u3002 \u00a0 \u53d8\u91cf<\/p>\n

\u540d\u89c4\u8303：\u9996\u5b57\u6bcd\u5c0f\u5199，\u540e\u9762\u6bcf\u4e2a\u5355\u8bcd\u9996\u5b57\u6bcd\u5927\u5199（\u5c0f\u9a7c\u5cf0\u5f0f）\u3002 \u00a0 \u65b9\u6cd5\u540d\u89c4\u8303：\u540c\u53d8\u91cf\u540d\u3002<\/p>\n

4\u3001Java\u81ea\u52a8\u88c5\u7bb1\u4e0e\u62c6\u7bb1 \u88c5\u7bb1\u5c31\u662f\u81ea\u52a8\u5c06\u57fa\u672c\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a\u5305\u88c5\u5668\u7c7b\u578b（int–>Integer）；\u8c03\u7528\u65b9\u6cd5：Integer\u7684 valueOf(int) \u65b9\u6cd5<\/p>\n

\u62c6\u7bb1\u5c31\u662f\u81ea\u52a8\u5c06\u5305\u88c5\u5668\u7c7b\u578b\u8f6c\u6362\u4e3a\u57fa\u672c\u6570\u636e\u7c7b\u578b（Integer–>int）\u3002\u8c03\u7528\u65b9\u6cd5：Integer\u7684 intValue\u65b9\u6cd5<\/p>\n

5\u3001 \u65b9\u6cd5\u91cd\u8f7d\u548c\u65b9\u6cd5\u91cd\u5199\u7684\u533a\u522b \u91cd\u5199(Override)<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u4ece\u5b57\u9762\u4e0a\u770b，\u91cd\u5199\u5c31\u662f\u91cd\u65b0\u5199\u4e00\u904d\u7684\u610f\u601d\u3002\u5176\u5b9e\u5c31\u662f\u5728\u5b50\u7c7b\u4e2d\u628a\u7236\u7c7b\u672c\u8eab\u6709\u7684\u65b9\u6cd5\u91cd\u65b0\u5199\u4e00\u904d\u3002\u5b50 \u7c7b\u7ee7\u627f\u4e86\u7236\u7c7b\u539f\u6709\u7684\u65b9\u6cd5，\u4f46\u6709\u65f6\u5b50\u7c7b\u5e76\u4e0d\u60f3\u539f\u5c01\u4e0d\u52a8\u7684\u7ee7\u627f\u7236\u7c7b\u4e2d\u7684\u67d0\u4e2a\u65b9\u6cd5，\u6240\u4ee5\u5728\u65b9\u6cd5\u540d， \u00a0\u53c2\u6570\u5217\u8868，\u8fd4\u56de\u7c7b\u578b(\u9664\u8fc7\u5b50\u7c7b\u4e2d\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u662f\u7236\u7c7b\u4e2d\u65b9\u6cd5\u8fd4\u56de\u503c\u7684\u5b50\u7c7b\u65f6)\u90fd\u76f8\u540c\u7684\u60c5\u51b5\u4e0b， \u00a0\u5bf9\u65b9\u6cd5\u4f53\u8fdb\u884c\u4fee\u6539\u6216\u91cd\u5199，\u8fd9\u5c31\u662f\u91cd\u5199\u3002\u4f46\u8981\u6ce8\u610f\u5b50\u7c7b\u51fd\u6570\u7684\u8bbf\u95ee\u4fee\u9970\u6743\u9650\u4e0d\u80fd\u5c11\u4e8e\u7236\u7c7b\u7684\u3002<\/p>\n

\u91cd\u8f7d（Overload ）<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5728\u4e00\u4e2a\u7c7b\u4e2d，\u540c\u540d\u7684\u65b9\u6cd5\u5982\u679c\u6709\u4e0d\u540c\u7684\u53c2\u6570\u5217\u8868（\u53c2\u6570\u7c7b\u578b\u4e0d\u540c\u3001\u53c2\u6570\u4e2a\u6570\u4e0d\u540c\u751a\u81f3\u662f\u53c2\u6570\u987a\u5e8f\u4e0d\u540c）\u5219\u89c6\u4e3a\u91cd\u8f7d\u3002\u540c\u65f6，\u91cd\u8f7d\u5bf9\u8fd4\u56de\u7c7b\u578b\u6ca1\u6709\u8981\u6c42，\u53ef\u4ee5\u76f8\u540c\u4e5f\u53ef\u4ee5\u4e0d\u540c，\u4f46\u4e0d\u80fd\u901a\u8fc7\u8fd4\u56de\u7c7b\u578b\u662f\u5426\u76f8\u540c\u6765\u5224\u65ad\u91cd\u8f7d\u3002<\/p>\n

6\u3001 equals\u4e0e == \u7684\u533a\u522b == \u6bd4\u8f83\u7684\u662f\u53d8\u91cf(\u6808)\u5185\u5b58\u4e2d\u5b58\u653e\u7684\u5bf9\u8c61\u7684(\u5806)\u5185\u5b58\u5730\u5740，\u7528\u6765\u5224\u65ad\u4e24\u4e2a\u5bf9\u8c61\u7684\u5730\u5740\u662f\u5426\u76f8\u540c，\u5373\u662f \u5426\u662f\u6307\u76f8\u540c\u4e00\u4e2a\u5bf9\u8c61\u3002\u6bd4\u8f83\u7684\u662f\u771f\u6b63\u610f\u4e49\u4e0a\u7684\u6307\u9488\u64cd\u4f5c\u3002<\/p>\n

equals\u7528\u6765\u6bd4\u8f83\u7684\u662f\u4e24\u4e2a\u5bf9\u8c61\u7684\u5185\u5bb9\u662f\u5426\u76f8\u7b49，\u7531\u4e8e\u6240\u6709\u7684\u7c7b\u90fd\u662f\u7ee7\u627f\u81eajava.lang.Object\u7c7b\u7684，\u6240 \u4ee5\u9002\u7528\u4e8e\u6240\u6709\u5bf9\u8c61，\u5982\u679c\u6ca1\u6709\u5bf9\u8be5\u65b9\u6cd5\u8fdb\u884c\u91cd\u5199\u7684\u8bdd，\u8c03\u7528\u7684\u4ecd\u7136\u662fObject\u7c7b\u4e2d\u7684\u65b9\u6cd5，\u800cObject \u00a0\u4e2d\u7684equals\u65b9\u6cd5\u8fd4\u56de\u7684\u5374\u662f==\u7684\u5224\u65ad\u3002<\/p>\n

7\u3001 Hashcode\u7684\u4f5c\u7528 \u00a0 \u00a0 \u00a0 \u00a0 java\u7684\u96c6\u5408\u6709\u4e24\u7c7b，\u4e00\u7c7b\u662fList，\u8fd8\u6709\u4e00\u7c7b\u662fSet\u3002\u524d\u8005\u6709\u5e8f\u53ef\u91cd\u590d，\u540e\u8005\u65e0\u5e8f\u4e0d\u91cd\u590d\u3002\u5f53\u6211\u4eec\u5728set \u4e2d\u63d2\u5165\u7684\u65f6\u5019\u600e\u4e48\u5224\u65ad\u662f\u5426\u5df2\u7ecf\u5b58\u5728\u8be5\u5143\u7d20\u5462，\u53ef\u4ee5\u901a\u8fc7equals\u65b9\u6cd5\u3002\u4f46\u662f\u5982\u679c\u5143\u7d20\u592a\u591a，\u7528\u8fd9\u6837 \u00a0\u7684\u65b9\u6cd5\u5c31\u4f1a\u6bd4\u8f83\u6ee1\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u4e8e\u662f\u6709\u4eba\u53d1\u660e\u4e86\u54c8\u5e0c\u7b97\u6cd5\u6765\u63d0\u9ad8\u96c6\u5408\u4e2d\u67e5\u627e\u5143\u7d20\u7684\u6548\u7387\u3002\u8fd9\u79cd\u65b9\u5f0f\u5c06\u96c6\u5408\u5206\u6210\u82e5\u5e72\u4e2a\u5b58\u50a8\u533a\u57df，\u6bcf\u4e2a\u5bf9\u8c61\u53ef\u4ee5\u8ba1\u7b97\u51fa\u4e00\u4e2a\u54c8\u5e0c\u7801，\u53ef\u4ee5\u5c06\u54c8\u5e0c\u7801\u5206\u7ec4，\u6bcf\u7ec4\u5206\u522b\u5bf9\u5e94\u67d0\u4e2a\u5b58\u50a8\u533a\u57df，\u6839\u636e\u4e00\u4e2a\u5bf9\u8c61\u7684\u54c8\u5e0c\u7801\u5c31\u53ef\u4ee5\u786e\u5b9a\u8be5\u5bf9\u8c61\u5e94\u8be5\u5b58\u50a8\u7684\u90a3\u4e2a\u533a\u57df\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 hashCode\u65b9\u6cd5\u53ef\u4ee5\u8fd9\u6837\u7406\u89e3：\u5b83\u8fd4\u56de\u7684\u5c31\u662f\u6839\u636e\u5bf9\u8c61\u7684\u5185\u5b58\u5730\u5740\u6362\u7b97\u51fa\u7684\u4e00\u4e2a\u503c\u3002\u8fd9\u6837\u4e00\u6765，\u5f53\u96c6\u5408\u8981\u6dfb\u52a0\u65b0\u7684\u5143\u7d20\u65f6，\u5148\u8c03\u7528\u8fd9\u4e2a\u5143\u7d20\u7684hashCode\u65b9\u6cd5，\u5c31\u4e00\u4e0b\u5b50\u80fd\u5b9a\u4f4d\u5230\u5b83\u5e94\u8be5\u653e\u7f6e\u7684\u7269\u7406\u4f4d\u7f6e\u4e0a\u3002\u5982\u679c\u8fd9\u4e2a\u4f4d\u7f6e\u4e0a\u6ca1\u6709\u5143\u7d20，\u5b83\u5c31\u53ef\u4ee5\u76f4\u63a5\u5b58\u50a8\u5728\u8fd9\u4e2a\u4f4d\u7f6e\u4e0a，\u4e0d\u7528\u518d\u8fdb\u884c\u4efb\u4f55\u6bd4\u8f83\u4e86；\u5982\u679c\u8fd9\u4e2a\u4f4d\u7f6e\u4e0a\u5df2\u7ecf\u6709\u5143\u7d20\u4e86，\u5c31\u8c03\u7528\u5b83\u7684equals\u65b9\u6cd5\u4e0e\u65b0\u5143\u7d20\u8fdb\u884c\u6bd4\u8f83，\u76f8\u540c\u7684\u8bdd\u5c31\u4e0d\u5b58\u4e86，\u4e0d\u76f8\u540c\u5c31\u6563\u5217\u5176\u5b83\u7684\u5730\u5740\u3002\u8fd9\u6837\u4e00\u6765\u5b9e\u9645\u8c03\u7528equals\u65b9\u6cd5\u7684\u6b21\u6570\u5c31\u5927\u5927\u964d\u4f4e\u4e86，\u51e0\u4e4e\u53ea\u9700\u8981\u4e00\u4e24\u6b21\u3002<\/p>\n

8\u3001 String\u3001StringBu\ufb00er \u548c StringBuilder \u7684\u533a\u522b\u662f\u4ec0\u4e48? \u00a0 \u00a0 \u00a0 \u00a0 String\u662f\u53ea\u8bfb\u5b57\u7b26\u4e32，\u5b83\u5e76\u4e0d\u662f\u57fa\u672c\u6570\u636e\u7c7b\u578b，\u800c\u662f\u4e00\u4e2a\u5bf9\u8c61\u3002\u4ece\u5e95\u5c42\u6e90\u7801\u6765\u770b\u662f\u4e00\u4e2a\ufb01nal\u7c7b\u578b\u7684 \u5b57\u7b26\u6570\u7ec4，\u6240\u5f15\u7528\u7684\u5b57\u7b26\u4e32\u4e0d\u80fd\u88ab\u6539\u53d8，\u4e00\u7ecf\u5b9a\u4e49，\u65e0\u6cd5\u518d\u589e\u5220\u6539\u3002\u6bcf\u6b21\u5bf9String\u7684\u64cd\u4f5c\u90fd\u4f1a\u751f\u6210 \u65b0\u7684String\u5bf9\u8c61\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 StringBuilder \u548c StringBuffer：\u90fd\u662f\u53ef\u53d8\u7684（mutable）\u3002\u5b83\u4eec\u53ef\u4ee5\u88ab\u591a\u6b21\u4fee\u6539，\u800c\u4e0d\u4f1a\u521b\u5efa\u65b0\u7684\u5bf9\u8c61.StringBuffer：\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002\u5b83\u63d0\u4f9b\u4e86\u540c\u6b65\u65b9\u6cd5，\u786e\u4fdd\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u5bf9\u5b57\u7b26\u4e32\u7684\u4fee\u6539\u662f\u5b89\u5168\u7684\u3002\u4f46\u662f，\u8fd9\u79cd\u540c\u6b65\u673a\u5236\u4f1a\u5e26\u6765\u6027\u80fd\u5f00\u9500\u3002StringBuilder：\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\u3002\u5b83\u6ca1\u6709\u63d0\u4f9b\u540c\u6b65\u65b9\u6cd5，\u56e0\u6b64\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u4f7f\u7528\u65f6\u9700\u8981\u624b\u52a8\u540c\u6b65\u3002\u7531\u4e8e\u6ca1\u6709\u540c\u6b65\u5f00\u9500，StringBuilder\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\u7684\u6027\u80fd\u4f18\u4e8eStringBuffer\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u64cd\u4f5c\u5c11\u91cf\u5b57\u7b26\u6570\u636e\u7528 String；\u5355\u7ebf\u7a0b\u64cd\u4f5c\u5927\u91cf\u6570\u636e\u7528 StringBuilder；\u591a\u7ebf\u7a0b\u64cd\u4f5c\u5927\u91cf\u6570\u636e\u7528 StringBuffer\u3002<\/p>\n

9\u3001ArrayList\u548clinkedList\u7684\u533a\u522b ArrayList：<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u57fa\u4e8e\u52a8\u6001\u6570\u7ec4\u5b9e\u73b0\u3002\u5e95\u5c42\u662f\u4e00\u4e2a\u6570\u7ec4，\u5f53\u6570\u7ec4\u6ee1\u4e86\u4e4b\u540e，\u4f1a\u81ea\u52a8\u6269\u5bb9，\u901a\u5e38\u6269\u5bb9\u4e3a\u539f\u6570\u7ec4\u7684 1.5 \u500d（\u5177\u4f53\u6269\u5bb9\u7b56\u7565\u5728\u4e0d\u540c\u7248\u672c\u7684 JDK \u4e2d\u53ef\u80fd\u6709\u6240\u4e0d\u540c）\u3002<\/p>\n

ArrayList<Integer> list = new ArrayList<>(); list.add(1); \/\/ \u5e95\u5c42\u4f1a\u521b\u5efa\u4e00\u4e2a\u6570\u7ec4，\u5e76\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u6570\u7ec4\u4e2d list.add(2); \u8fd0\u884c\u9879\u76ee\u5e76\u4e0b\u8f7d\u6e90\u7801 LinkedList：<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u57fa\u4e8e\u53cc\u5411\u94fe\u8868\u5b9e\u73b0\u3002\u6bcf\u4e2a\u5143\u7d20\u662f\u4e00\u4e2a\u8282\u70b9，\u6bcf\u4e2a\u8282\u70b9\u5305\u542b\u6570\u636e\u90e8\u5206\u548c\u6307\u5411\u524d\u540e\u8282\u70b9\u7684\u6307\u9488\u3002<\/p>\n

LinkedList<Integer> list = new LinkedList<>(); list.add(1); \/\/ \u5e95\u5c42\u4f1a\u521b\u5efa\u4e00\u4e2a\u8282\u70b9，\u5e76\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u8282\u70b9\u4e2d list.add(2); \u8fd0\u884c\u9879\u76ee\u5e76\u4e0b\u8f7d\u6e90\u7801 10\u3001 HashMap\u548cHashTable\u7684\u533a\u522b \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0 1\u3001\u4e24\u8005\u7236\u7c7b\u4e0d\u540c<\/p>\n

HashMap\u662f\u7ee7\u627f\u81eaAbstractMap\u7c7b，\u800cHashtable\u662f\u7ee7\u627f\u81eaDictionary\u7c7b\u3002\u4e0d\u8fc7\u5b83\u4eec\u90fd\u5b9e\u73b0\u4e86\u540c\u65f6 \u5b9e\u73b0\u4e86map\u3001Cloneable（\u53ef\u590d\u5236）\u3001 \u00a0Serializable（\u53ef\u5e8f\u5217\u5316）\u8fd9\u4e09\u4e2a\u63a5\u53e3\u3002<\/p>\n

2\u3001\u5bf9\u5916\u63d0\u4f9b\u7684\u63a5\u53e3\u4e0d\u540c<\/p>\n

Hashtable\u6bd4HashMap\u591a\u63d0\u4f9b\u4e86elments() \u548ccontains() \u4e24\u4e2a\u65b9\u6cd5\u3002 \u00a0 elments() \u65b9\u6cd5\u7ee7\u627f\u81ea Hashtable\u7684\u7236\u7c7bDictionnary\u3002elements() \u65b9\u6cd5\u7528\u4e8e\u8fd4\u56de\u6b64Hashtable\u4e2d\u7684value\u7684\u679a\u4e3e\u3002<\/p>\n

contains()\u65b9\u6cd5\u5224\u65ad\u8be5Hashtable\u662f\u5426\u5305\u542b\u4f20\u5165\u7684value\u3002\u5b83\u7684\u4f5c\u7528\u4e0econtainsValue()\u4e00\u81f4\u3002\u4e8b\u5b9e \u4e0a，contansValue() \u5c31\u53ea\u662f\u8c03\u7528\u4e86\u4e00\u4e0bcontains() \u65b9\u6cd5\u3002<\/p>\n

3\u3001\u5bf9null\u7684\u652f\u6301\u4e0d\u540c<\/p>\n

Hashtable：key\u548cvalue\u90fd\u4e0d\u80fd\u4e3anull\u3002<\/p>\n

HashMap ：key\u53ef\u4ee5\u4e3anull，\u4f46\u662f\u8fd9\u6837\u7684key\u53ea\u80fd\u6709\u4e00\u4e2a，\u56e0\u4e3a\u5fc5\u987b\u4fdd\u8bc1key\u7684\u552f\u4e00\u6027；\u53ef\u4ee5\u6709\u591a\u4e2a key\u503c\u5bf9\u5e94\u7684value\u4e3anull\u3002<\/p>\n

4\u3001\u5b89\u5168\u6027\u4e0d\u540c<\/p>\n

HashMap\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684，\u5728\u591a\u7ebf\u7a0b\u5e76\u53d1\u7684\u73af\u5883\u4e0b，\u53ef\u80fd\u4f1a\u4ea7\u751f\u6b7b\u9501\u7b49\u95ee\u9898，\u56e0\u6b64\u9700\u8981\u5f00\u53d1\u4eba\u5458\u81ea \u5df1\u5904\u7406\u591a\u7ebf\u7a0b\u7684\u5b89\u5168\u95ee\u9898\u3002<\/p>\n

Hashtable\u662f\u7ebf\u7a0b\u5b89\u5168\u7684，\u5b83\u7684\u6bcf\u4e2a\u65b9\u6cd5\u4e0a\u90fd\u6709synchronized \u5173\u952e\u5b57，\u56e0\u6b64\u53ef\u76f4\u63a5\u7528\u4e8e\u591a\u7ebf\u7a0b\u4e2d\u3002<\/p>\n

\u867d\u7136HashMap\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684，\u4f46\u662f\u5b83\u7684\u6548\u7387\u8fdc\u8fdc\u9ad8\u4e8eHashtable，\u8fd9\u6837\u8bbe\u8ba1\u662f\u5408\u7406\u7684，\u56e0\u4e3a\u5927\u90e8 \u5206\u7684\u4f7f\u7528\u573a\u666f\u90fd\u662f\u5355\u7ebf\u7a0b\u3002\u5f53\u9700\u8981\u591a\u7ebf\u7a0b\u64cd\u4f5c\u7684\u65f6\u5019\u53ef\u4ee5\u4f7f\u7528\u7ebf\u7a0b\u5b89\u5168\u7684ConcurrentHashMap\u3002<\/p>\n

ConcurrentHashMap\u867d\u7136\u4e5f\u662f\u7ebf\u7a0b\u5b89\u5168\u7684，\u4f46\u662f\u5b83\u7684\u6548\u7387\u6bd4Hashtable\u8981\u9ad8\u597d\u591a\u500d\u3002\u56e0\u4e3a ConcurrentHashMap\u4f7f\u7528\u4e86\u5206\u6bb5\u9501，\u5e76\u4e0d\u5bf9\u6574\u4e2a\u6570\u636e\u8fdb\u884c\u9501\u5b9a\u3002<\/p>\n

5\u3001\u521d\u59cb\u5bb9\u91cf\u5927\u5c0f\u548c\u6bcf\u6b21\u6269\u5145\u5bb9\u91cf\u5927\u5c0f\u4e0d\u540c<\/p>\n

6\u3001\u8ba1\u7b97hash\u503c\u7684\u65b9\u6cd5\u4e0d\u540c<\/p>\n

11\u3001 Collection\u5305\u7ed3\u6784，\u4e0eCollections\u7684\u533a\u522b \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Collection\u662f\u96c6\u5408\u7c7b\u7684\u4e0a\u7ea7\u63a5\u53e3，\u5b50\u63a5\u53e3\u6709 Set\u3001 List\u3001 LinkedList\u3001ArrayList\u3001Vector\u3001Stack\u3001 Set； \u662f\u96c6\u5408\u7c7b\u7684\u4e00\u4e2a\u5e2e\u52a9\u7c7b， \u00a0\u5b83\u5305\u542b\u6709\u5404\u79cd\u6709\u5173\u96c6\u5408\u64cd\u4f5c\u7684\u9759\u6001\u591a\u6001\u65b9\u6cd5，\u7528\u4e8e\u5b9e\u73b0\u5bf9\u5404\u79cd\u96c6\u5408\u7684\u641c\u7d22\u3001\u6392\u5e8f\u3001\u7ebf\u7a0b\u5b89\u5168\u5316\u7b49\u64cd\u4f5c\u3002\u6b64\u7c7b\u4e0d\u80fd\u5b9e\u4f8b\u5316，\u5c31\u50cf\u4e00\u4e2a\u5de5\u5177\u7c7b，\u670d\u52a1\u4e8eJava\u7684 Collection\u6846\u67b6\u3002<\/p>\n

12\u3001\u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d\u7684\u533a\u522b\u662f\u4ec0\u4e48? \u00a0 \u6d45\u62f7\u8d1d:\u88ab\u590d\u5236\u5bf9\u8c61\u7684\u6240\u6709\u53d8\u91cf\u90fd\u542b\u6709\u4e0e\u539f\u6765\u7684\u5bf9\u8c61\u76f8\u540c\u7684\u503c,\u800c\u6240\u6709\u7684\u5bf9\u5176\u4ed6\u5bf9\u8c61\u7684\u5f15\u7528\u4ecd\u7136\u6307 \u5411\u539f\u6765\u7684\u5bf9\u8c61.\u6362\u8a00\u4e4b,\u6d45\u62f7\u8d1d\u4ec5\u4ec5\u590d\u5236\u6240\u8003\u8651\u7684\u5bf9\u8c61,\u800c\u4e0d\u590d\u5236\u5b83\u6240\u5f15\u7528\u7684\u5bf9\u8c61.<\/p>\n

\u00a0 \u6df1\u62f7\u8d1d:\u88ab\u590d\u5236\u5bf9\u8c61\u7684\u6240\u6709\u53d8\u91cf\u90fd\u542b\u6709\u4e0e\u539f\u6765\u7684\u5bf9\u8c61\u76f8\u540c\u7684\u503c.\u800c\u90a3\u4e9b\u5f15\u7528\u5176\u4ed6\u5bf9\u8c61\u7684\u53d8\u91cf\u5c06\u6307\u5411 \u88ab\u590d\u5236\u8fc7\u7684\u65b0\u5bf9\u8c61.\u800c\u4e0d\u518d\u662f\u539f\u6709\u7684\u90a3\u4e9b\u88ab\u5f15\u7528\u7684\u5bf9\u8c61.\u6362\u8a00\u4e4b.\u6df1\u62f7\u8d1d\u628a\u8981\u590d\u5236\u7684\u5bf9\u8c61\u6240\u5f15\u7528\u7684 \u00a0 \u5bf9\u8c61\u90fd\u590d\u5236\u4e86\u4e00\u904d.<\/p>\n

13\u3001\ufb01nal\u6709\u54ea\u4e9b\u7528\u6cd5? \ufb01nal\u4e5f\u662f\u5f88\u591a\u9762\u8bd5\u559c\u6b22\u95ee\u7684\u5730\u65b9,\u4f46\u6211\u89c9\u5f97\u8fd9\u4e2a\u95ee\u9898\u5f88\u65e0\u804a,\u901a\u5e38\u80fd\u56de\u7b54\u4e0b\u4ee5\u4e0b5\u70b9\u5c31\u4e0d\u9519\u4e86:<\/p>\n

\u00a0 \u88ab\ufb01nal\u4fee\u9970\u7684\u7c7b\u4e0d\u53ef\u4ee5\u88ab\u7ee7\u627f<\/p>\n

\u00a0 \u88ab\ufb01nal\u4fee\u9970\u7684\u65b9\u6cd5\u4e0d\u53ef\u4ee5\u88ab\u91cd\u5199<\/p>\n

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public calss PreCache{<\/p>\n

static{<\/p>\n

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}<\/p>\n

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