{"id":90,"date":"2007-04-12T17:03:15","date_gmt":"2007-04-12T17:03:15","guid":{"rendered":"http:\/\/jingjinghuang.com\/blog2\/?p=90"},"modified":"2007-06-22T01:15:38","modified_gmt":"2007-06-22T01:15:38","slug":"%5B%E8%BD%AC%E5%B8%96%5Djava%E4%BB%A3%E7%A0%81%E7%BC%96%E5%86%99%E7%9A%8430%E6%9D%A1%E5%BB%BA%E8%AE%AE","status":"publish","type":"post","link":"https:\/\/huangjingjing.com\/blog\/?p=90","title":{"rendered":"[\u8f6c\u5e16]Java\u4ee3\u7801\u7f16\u5199\u768430\u6761\u5efa\u8bae"},"content":{"rendered":"<p>\u4ee3\u7801\u7f16\u5199\u768430\u6761\u5efa\u8bae<\/p>\n<p>(1) 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Java\u5305\uff08Package\uff09\u5c5e\u4e8e\u4e00\u79cd\u7279\u6b8a\u60c5\u51b5\uff1a\u5b83\u4eec\u5168\u90fd\u662f\u5c0f\u5199\u5b57\u6bcd\uff0c\u5373\u4fbf\u4e2d\u95f4\u7684\u5355\u8bcd\u4ea6\u662f\u5982\u6b64\u3002\u5bf9\u4e8e\u57df\u540d\u6269\u5c55\u540d\u79f0\uff0c\u5982com\uff0corg\uff0cnet\u6216\u8005edu\u7b49\uff0c\u5168\u90e8\u90fd\u5e94\u5c0f\u5199\uff08\u8fd9\u4e5f\u662fJava 1.1\u548cJava 1.2\u7684\u533a\u522b\u4e4b\u4e00\uff09\u3002 <br \/>(2) \u4e3a\u4e86\u5e38\u89c4\u7528\u9014\u800c\u521b\u5efa\u4e00\u4e2a\u7c7b\u65f6\uff0c\u8bf7\u91c7\u53d6&#8221;\u7ecf\u5178\u5f62\u5f0f&#8221;\uff0c\u5e76\u5305\u542b\u5bf9\u4e0b\u8ff0\u5143\u7d20\u7684\u5b9a\u4e49\uff1a equals() hashCode() toString() clone() \uff08implement Cloneable\uff09 implement Serializable <br \/>(3) 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\u4efb\u4f55\u65f6\u5019\u53ea\u8981\u53d1\u73b0\u7c7b\u4e0e\u7c7b\u4e4b\u95f4\u7ed3\u5408\u5f97\u975e\u5e38\u7d27\u5bc6\uff0c\u5c31\u9700\u8981\u8003\u8651\u662f\u5426\u91c7\u7528\u5185\u90e8\u7c7b\uff0c\u4ece\u800c\u6539\u5584\u7f16\u7801\u53ca\u7ef4\u62a4\u5de5\u4f5c\uff08\u53c2\u89c1\u7b2c14\u7ae014.1.2\u5c0f\u8282\u7684&#8221;\u7528\u5185\u90e8\u7c7b\u6539\u8fdb\u4ee3\u7801&#8221;\uff09\u3002 <br \/>(11) \u5c3d\u53ef\u80fd\u7ec6\u81f4\u5730\u52a0\u4e0a\u6ce8\u91ca\uff0c\u5e76\u7528javadoc\u6ce8\u91ca\u6587\u6863\u8bed\u6cd5\u751f\u6210\u81ea\u5df1\u7684\u7a0b\u5e8f\u6587\u6863\u3002 <br \/>(12) \u907f\u514d\u4f7f\u7528&#8221;\u9b54\u672f\u6570\u5b57&#8221;\uff0c\u8fd9\u4e9b\u6570\u5b57\u5f88\u96be\u4e0e\u4ee3\u7801\u5f88\u597d\u5730\u914d\u5408\u3002\u5982\u4ee5\u540e\u9700\u8981\u4fee\u6539\u5b83\uff0c\u65e0\u7591\u4f1a\u6210\u4e3a\u4e00\u573a\u5669\u68a6\uff0c\u56e0\u4e3a\u6839\u672c\u4e0d\u77e5\u9053&#8221;100&#8243;\u5230\u5e95\u662f\u6307&#8221;\u6570\u7ec4\u5927\u5c0f&#8221;\u8fd8\u662f&#8221;\u5176\u4ed6\u5168\u7136\u4e0d\u540c\u7684\u4e1c\u897f&#8221;\u3002\u6240\u4ee5\uff0c\u6211\u4eec\u5e94\u521b\u5efa\u4e00\u4e2a\u5e38\u6570\uff0c\u5e76\u4e3a\u5176\u4f7f\u7528\u5177\u6709\u8bf4\u670d\u529b\u7684\u63cf\u8ff0\u6027\u540d\u79f0\uff0c\u5e76\u5728\u6574\u4e2a\u7a0b\u5e8f\u4e2d\u90fd\u91c7\u7528\u5e38\u6570\u6807\u8bc6\u7b26\u3002\u8fd9\u6837\u53ef\u4f7f\u7a0b\u5e8f\u66f4\u6613\u7406\u89e3\u4ee5\u53ca\u66f4\u6613\u7ef4\u62a4\u3002 <\/p>\n<p>(13) \u6d89\u53ca\u6784\u5efa\u5668\u548c\u5f02\u5e38\u7684\u65f6\u5019\uff0c\u901a\u5e38\u5e0c\u671b\u91cd\u65b0\u4e22\u5f03\u5728\u6784\u5efa\u5668\u4e2d\u6355\u83b7\u7684\u4efb\u4f55\u5f02\u5e38&#8211;\u5982\u679c\u5b83\u9020\u6210\u4e86\u90a3\u4e2a\u5bf9\u8c61\u7684\u521b\u5efa\u5931\u8d25\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u8c03\u7528\u8005\u5c31\u4e0d\u4f1a\u4ee5\u4e3a\u90a3\u4e2a\u5bf9\u8c61\u5df2\u6b63\u786e\u5730\u521b\u5efa\uff0c\u4ece\u800c\u76f2\u76ee\u5730\u7ee7\u7eed\u3002 <\/p>\n<p>(14) \u5f53\u5ba2\u6237\u7a0b\u5e8f\u5458\u7528\u5b8c\u5bf9\u8c61\u4ee5\u540e\uff0c\u82e5\u4f60\u7684\u7c7b\u8981\u6c42\u8fdb\u884c\u4efb\u4f55\u6e05\u9664\u5de5\u4f5c\uff0c\u53ef\u8003\u8651\u5c06\u6e05\u9664\u4ee3\u7801\u7f6e\u4e8e\u4e00\u4e2a\u826f\u597d\u5b9a\u4e49\u7684\u65b9\u6cd5\u91cc\uff0c\u91c7\u7528\u7c7b\u4f3c\u4e8ecleanup()\u8fd9\u6837\u7684\u540d\u5b57\uff0c\u660e\u786e\u8868\u660e\u81ea\u5df1\u7684\u7528\u9014\u3002\u9664\u6b64\u4ee5\u5916\uff0c\u53ef\u5728\u7c7b\u5185\u653e\u7f6e\u4e00\u4e2aboolean\uff08\u5e03\u5c14\uff09\u6807\u8bb0\uff0c\u6307\u51fa\u5bf9\u8c61\u662f\u5426\u5df2\u88ab\u6e05\u9664\u3002\u5728\u7c7b\u7684finalize()\u65b9\u6cd5\u91cc\uff0c\u8bf7\u786e\u5b9a\u5bf9\u8c61\u5df2\u88ab\u6e05\u9664\uff0c\u5e76\u5df2\u4e22\u5f03\u4e86\u4eceRuntimeException\u7ee7\u627f\u7684\u4e00\u4e2a\u7c7b\uff08\u5982\u679c\u8fd8\u6ca1\u6709\u7684\u8bdd\uff09\uff0c\u4ece\u800c\u6307\u51fa\u4e00\u4e2a\u7f16\u7a0b\u9519\u8bef\u3002\u5728\u91c7\u53d6\u8c61\u8fd9\u6837\u7684\u65b9\u6848\u4e4b\u524d\uff0c\u8bf7\u786e\u5b9afinalize()\u80fd\u591f\u5728\u81ea\u5df1\u7684\u7cfb\u7edf\u4e2d\u5de5\u4f5c\uff08\u53ef\u80fd\u9700\u8981\u8c03\u7528System.runFinalizersOnExit(true)\uff0c\u4ece\u800c\u786e\u4fdd\u8fd9\u4e00\u884c\u4e3a\uff09\u3002 <\/p>\n<p>(15) \u5728\u4e00\u4e2a\u7279\u5b9a\u7684\u4f5c\u7528\u57df\u5185\uff0c\u82e5\u4e00\u4e2a\u5bf9\u8c61\u5fc5\u987b\u6e05\u9664\uff08\u975e\u7531\u5783\u573e\u6536\u96c6\u673a\u5236\u5904\u7406\uff09\uff0c\u8bf7\u91c7\u7528\u4e0b\u8ff0\u65b9\u6cd5\uff1a\u521d\u59cb\u5316\u5bf9\u8c61\uff1b\u82e5\u6210\u529f\uff0c\u5219\u7acb\u5373\u8fdb\u5165\u4e00\u4e2a\u542b\u6709finally\u4ece\u53e5\u7684try\u5757\uff0c\u5f00\u59cb\u6e05\u9664\u5de5\u4f5c\u3002 <\/p>\n<p>(16) \u82e5\u5728\u521d\u59cb\u5316\u8fc7\u7a0b\u4e2d\u9700\u8981\u8986\u76d6\uff08\u53d6\u6d88\uff09finalize()\uff0c\u8bf7\u8bb0\u4f4f\u8c03\u7528super.finalize()\uff08\u82e5Object\u5c5e\u4e8e\u6211\u4eec\u7684\u76f4\u63a5\u8d85\u7c7b\uff0c\u5219\u65e0\u6b64\u5fc5\u8981\uff09\u3002\u5728\u5bf9finalize()\u8fdb\u884c\u8986\u76d6\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5bf9super.finalize()\u7684\u8c03\u7528\u5e94\u5c5e\u4e8e\u6700\u540e\u4e00\u4e2a\u884c\u52a8\uff0c\u800c\u4e0d\u5e94\u662f\u7b2c\u4e00\u4e2a\u884c\u52a8\uff0c\u8fd9\u6837\u53ef\u786e\u4fdd\u5728\u9700\u8981\u57fa\u7840\u7c7b\u7ec4\u4ef6\u7684\u65f6\u5019\u5b83\u4eec\u4f9d\u7136\u6709\u6548\u3002 <\/p>\n<p>(17) \u521b\u5efa\u5927\u5c0f\u56fa\u5b9a\u7684\u5bf9\u8c61\u96c6\u5408\u65f6\uff0c\u8bf7\u5c06\u5b83\u4eec\u4f20\u8f93\u81f3\u4e00\u4e2a\u6570\u7ec4\uff08\u82e5\u51c6\u5907\u4ece\u4e00\u4e2a\u65b9\u6cd5\u91cc\u8fd4\u56de\u8fd9\u4e2a\u96c6\u5408\uff0c\u66f4\u5e94\u5982\u6b64\u64cd\u4f5c\uff09\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u6211\u4eec\u5c31\u53ef\u4eab\u53d7\u5230\u6570\u7ec4\u5728\u7f16\u8bd1\u671f\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\u7684\u597d\u5904\u3002\u6b64\u5916\uff0c\u4e3a\u4f7f\u7528\u5b83\u4eec\uff0c\u6570\u7ec4\u7684\u63a5\u6536\u8005\u4e5f\u8bb8\u5e76\u4e0d\u9700\u8981\u5c06\u5bf9\u8c61&#8221;\u9020\u578b&#8221;\u5230\u6570\u7ec4\u91cc\u3002 <\/p>\n<p>(18) \u5c3d\u91cf\u4f7f\u7528interfaces\uff0c\u4e0d\u8981\u4f7f\u7528abstract\u7c7b\u3002\u82e5\u5df2\u77e5\u67d0\u6837\u4e1c\u897f\u51c6\u5907\u6210\u4e3a\u4e00\u4e2a\u57fa\u7840\u7c7b\uff0c\u90a3\u4e48\u7b2c\u4e00\u4e2a\u9009\u62e9\u5e94\u662f\u5c06\u5176\u53d8\u6210\u4e00\u4e2ainterface\uff08\u63a5\u53e3\uff09\u3002\u53ea\u6709\u5728\u4e0d\u5f97\u4e0d\u4f7f\u7528\u65b9\u6cd5\u5b9a\u4e49\u6216\u8005\u6210\u5458\u53d8\u91cf\u7684\u65f6\u5019\uff0c\u624d\u9700\u8981\u5c06\u5176\u53d8\u6210\u4e00\u4e2aabstract\uff08\u62bd\u8c61\uff09\u7c7b\u3002\u63a5\u53e3\u4e3b\u8981\u63cf\u8ff0\u4e86\u5ba2\u6237\u5e0c\u671b\u505a\u4ec0\u4e48\u4e8b\u60c5\uff0c\u800c\u4e00\u4e2a\u7c7b\u5219\u81f4\u529b\u4e8e\uff08\u6216\u5141\u8bb8\uff09\u5177\u4f53\u7684\u5b9e\u65bd\u7ec6\u8282\u3002 <\/p>\n<p>(19) \u5728\u6784\u5efa\u5668\u5185\u90e8\uff0c\u53ea\u8fdb\u884c\u90a3\u4e9b\u5c06\u5bf9\u8c61\u8bbe\u4e3a\u6b63\u786e\u72b6\u6001\u6240\u9700\u7684\u5de5\u4f5c\u3002\u5c3d\u53ef\u80fd\u5730\u907f\u514d\u8c03\u7528\u5176\u4ed6\u65b9\u6cd5\uff0c\u56e0\u4e3a\u90a3\u4e9b\u65b9\u6cd5\u53ef\u80fd\u88ab\u5176\u4ed6\u4eba\u8986\u76d6\u6216\u53d6\u6d88\uff0c\u4ece\u800c\u5728\u6784\u5efa\u8fc7\u7a0b\u4e2d\u4ea7\u751f\u4e0d\u53ef\u9884\u77e5\u7684\u7ed3\u679c\uff08\u53c2\u89c1\u7b2c7\u7ae0\u7684\u8be6\u7ec6\u8bf4\u660e\uff09\u3002 <\/p>\n<p>(20) \u5bf9\u8c61\u4e0d\u5e94\u53ea\u662f\u7b80\u5355\u5730\u5bb9\u7eb3\u4e00\u4e9b\u6570\u636e\uff1b\u5b83\u4eec\u7684\u884c\u4e3a\u4e5f\u5e94\u5f97\u5230\u826f\u597d\u7684\u5b9a\u4e49\u3002 <\/p>\n<p>(21) \u5728\u73b0\u6210\u7c7b\u7684\u57fa\u7840\u4e0a\u521b\u5efa\u65b0\u7c7b\u65f6\uff0c\u8bf7\u9996\u5148\u9009\u62e9&#8221;\u65b0\u5efa&#8221;\u6216&#8221;\u521b\u4f5c&#8221;\u3002\u53ea\u6709\u81ea\u5df1\u7684\u8bbe\u8ba1\u8981\u6c42\u5fc5\u987b\u7ee7\u627f\u65f6\uff0c\u624d\u5e94\u8003\u8651\u8fd9\u65b9\u9762\u7684\u95ee\u9898\u3002\u82e5\u5728\u672c\u6765\u5141\u8bb8\u65b0\u5efa\u7684\u573a\u5408\u4f7f\u7528\u4e86\u7ee7\u627f\uff0c\u5219\u6574\u4e2a\u8bbe\u8ba1\u4f1a\u53d8\u5f97\u6ca1\u6709\u5fc5\u8981\u5730\u590d\u6742\u3002 <\/p>\n<p>(22) \u7528\u7ee7\u627f\u53ca\u65b9\u6cd5\u8986\u76d6\u6765\u8868\u793a\u884c\u4e3a\u95f4\u7684\u5dee\u5f02\uff0c\u800c\u7528\u5b57\u6bb5\u8868\u793a\u72b6\u6001\u95f4\u7684\u533a\u522b\u3002\u4e00\u4e2a\u975e\u5e38\u6781\u7aef\u7684\u4f8b\u5b50\u662f\u901a\u8fc7\u5bf9\u4e0d\u540c\u7c7b\u7684\u7ee7\u627f\u6765\u8868\u793a\u989c\u8272\uff0c\u8fd9\u662f\u7edd\u5bf9\u5e94\u8be5\u907f\u514d\u7684\uff1a\u5e94\u76f4\u63a5\u4f7f\u7528\u4e00\u4e2a&#8221;\u989c\u8272&#8221;\u5b57\u6bb5\u3002 <\/p>\n<p>(23) \u4e3a\u907f\u514d\u7f16\u7a0b\u65f6\u9047\u5230\u9ebb\u70e6\uff0c\u8bf7\u4fdd\u8bc1\u5728\u81ea\u5df1\u7c7b\u8def\u5f84\u6307\u5230\u7684\u4efb\u4f55\u5730\u65b9\uff0c\u6bcf\u4e2a\u540d\u5b57\u90fd\u4ec5\u5bf9\u5e94\u4e00\u4e2a\u7c7b\u3002\u5426\u5219\uff0c\u7f16\u8bd1\u5668\u53ef\u80fd\u5148\u627e\u5230\u540c\u540d\u7684\u53e6\u4e00\u4e2a\u7c7b\uff0c\u5e76\u62a5\u544a\u51fa\u9519\u6d88\u606f\u3002\u82e5\u6000\u7591\u81ea\u5df1\u78b0\u5230\u4e86\u7c7b\u8def\u5f84\u95ee\u9898\uff0c\u8bf7\u8bd5\u8bd5\u5728\u7c7b\u8def\u5f84\u7684\u6bcf\u4e00\u4e2a\u8d77\u70b9\uff0c\u641c\u7d22\u4e00\u4e0b\u540c\u540d\u7684.class\u6587\u4ef6\u3002 <\/p>\n<p>(24) \u5728Java 1.1 AWT\u4e2d\u4f7f\u7528\u4e8b\u4ef6&#8221;\u9002\u914d\u5668&#8221;\u65f6\uff0c\u7279\u522b\u5bb9\u6613\u78b0\u5230\u4e00\u4e2a\u9677\u9631\u3002\u82e5\u8986\u76d6\u4e86\u67d0\u4e2a\u9002\u914d\u5668\u65b9\u6cd5\uff0c\u540c\u65f6\u62fc\u5199\u65b9\u6cd5\u6ca1\u6709\u7279\u522b\u8bb2\u7a76\uff0c\u6700\u540e\u7684\u7ed3\u679c\u5c31\u662f\u65b0\u6dfb\u52a0\u4e00\u4e2a\u65b9\u6cd5\uff0c\u800c\u4e0d\u662f\u8986\u76d6\u73b0\u6210\u65b9\u6cd5\u3002\u7136\u800c\uff0c\u7531\u4e8e\u8fd9\u6837\u505a\u662f\u5b8c\u5168\u5408\u6cd5\u7684\uff0c\u6240\u4ee5\u4e0d\u4f1a\u4ece\u7f16\u8bd1\u5668\u6216\u8fd0\u884c\u671f\u7cfb\u7edf\u83b7\u5f97\u4efb\u4f55\u51fa\u9519\u63d0\u793a&#8211;\u53ea\u4e0d\u8fc7\u4ee3\u7801\u7684\u5de5\u4f5c\u5c31\u53d8\u5f97\u4e0d\u6b63\u5e38\u4e86\u3002 <\/p>\n<p>(25) \u7528\u5408\u7406\u7684\u8bbe\u8ba1\u65b9\u6848\u6d88\u9664&#8221;\u4f2a\u529f\u80fd&#8221;\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5047\u82e5\u53ea\u9700\u8981\u521b\u5efa\u7c7b\u7684\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5c31\u4e0d\u8981\u63d0\u524d\u9650\u5236\u81ea\u5df1\u4f7f\u7528\u5e94\u7528\u7a0b\u5e8f\uff0c\u5e76\u52a0\u4e0a\u4e00\u6761&#8221;\u53ea\u751f\u6210\u5176\u4e2d\u4e00\u4e2a&#8221;\u6ce8\u91ca\u3002\u8bf7\u8003\u8651\u5c06\u5176\u5c01\u88c5\u6210\u4e00\u4e2a&#8221;\u72ec\u751f\u5b50&#8221;\u7684\u5f62\u5f0f\u3002\u82e5\u5728\u4e3b\u7a0b\u5e8f\u91cc\u6709\u5927\u91cf\u6563\u4e71\u7684\u4ee3\u7801\uff0c\u7528\u4e8e\u521b\u5efa\u81ea\u5df1\u7684\u5bf9\u8c61\uff0c\u8bf7\u8003\u8651\u91c7\u7eb3\u4e00\u79cd\u521b\u9020\u6027\u7684\u65b9\u6848\uff0c\u5c06\u4e9b\u4ee3\u7801\u5c01\u88c5\u8d77\u6765\u3002 <\/p>\n<p>(26) \u8b66\u60d5&#8221;\u5206\u6790\u762b\u75ea&#8221;\u3002\u8bf7\u8bb0\u4f4f\uff0c\u65e0\u8bba\u5982\u4f55\u90fd\u8981\u63d0\u524d\u4e86\u89e3\u6574\u4e2a\u9879\u76ee\u7684\u72b6\u51b5\uff0c\u518d\u53bb\u8003\u5bdf\u5176\u4e2d\u7684\u7ec6\u8282\u3002\u7531\u4e8e\u628a\u63e1\u4e86\u5168\u5c40\uff0c\u53ef\u5feb\u901f\u8ba4\u8bc6\u81ea\u5df1\u672a\u77e5\u7684\u4e00\u4e9b\u56e0\u7d20\uff0c\u9632\u6b62\u5728\u8003\u5bdf\u7ec6\u8282\u7684\u65f6\u5019\u9677\u5165&#8221;\u6b7b\u903b\u8f91&#8221;\u4e2d\u3002 <\/p>\n<p>(27) \u8b66\u60d5&#8221;\u8fc7\u65e9\u4f18\u5316&#8221;\u3002\u9996\u5148\u8ba9\u5b83\u8fd0\u884c\u8d77\u6765\uff0c\u518d\u8003\u8651\u53d8\u5f97\u66f4\u5feb&#8211;\u4f46\u53ea\u6709\u5728\u81ea\u5df1\u5fc5\u987b\u8fd9\u6837\u505a\u3001\u800c\u4e14\u7ecf\u8bc1\u5b9e\u5728\u67d0\u90e8\u5206\u4ee3\u7801\u4e2d\u7684\u786e\u5b58\u5728\u4e00\u4e2a\u6027\u80fd\u74f6\u9888\u7684\u65f6\u5019\uff0c\u624d\u5e94\u8fdb\u884c\u4f18\u5316\u3002\u9664\u975e\u7528\u4e13\u95e8\u7684\u5de5\u5177\u5206\u6790\u74f6\u9888\uff0c\u5426\u5219\u5f88\u6709\u53ef\u80fd\u662f\u5728\u6d6a\u8d39\u81ea\u5df1\u7684\u65f6\u95f4\u3002\u6027\u80fd\u63d0\u5347\u7684\u9690\u542b\u4ee3\u4ef7\u662f\u81ea\u5df1\u7684\u4ee3\u7801\u53d8\u5f97\u96be\u4e8e\u7406\u89e3\uff0c\u800c\u4e14\u96be\u4e8e\u7ef4\u62a4\u3002 <\/p>\n<p>(28) 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