{"id":110,"date":"2018-06-07T22:10:37","date_gmt":"2018-06-07T14:10:37","guid":{"rendered":"http:\/\/www.sniper97.cn\/?p=110"},"modified":"2018-06-07T22:10:37","modified_gmt":"2018-06-07T14:10:37","slug":"java-se","status":"publish","type":"post","link":"http:\/\/www.sniper97.cn\/index.php\/note\/java-se\/110\/","title":{"rendered":"JAVA SE"},"content":{"rendered":"

\u4ee5\u4e0b\u662f\u5f53\u521d\u5b66java se\u65f6\u968f\u624b\u8bb0\u7684\uff0c\u6ca1\u4ec0\u4e48\u65f6\u95f4\u6574\u7406\uff0c\u4e0d\u80fd\u4f5c\u4e3a\u6559\u7a0b\uff0c\u4ec5\u80fd\u4f5c\u4e3a\u590d\u4e60\u6750\u6599\u3002<\/strong>
\nextends \u7ee7\u627f\u7684\u5173\u952e\u5b57
\nabstract \u62bd\u8c61\u7684\u5173\u952e\u5b57
\nimplements \u63a5\u53e3\u7684\u5b9e\u73b0\u5173\u952e\u5b57
\nthrows \u58f0\u660e\u8be5\u529f\u80fd\u6709\u53ef\u80fd\u5f88\u51fa\u73b0\u95ee\u9898\u7684\u5173\u952e\u5b57
\n\u5bf9\u4e8e\u53d8\u91cf final \u548cstatic\u7684\u533a\u522b
\nstatic \u53ea\u662f\u5728\u5185\u5b58\u4e2d\u72ec\u7acb\uff0c\u53ef\u4ee5\u4fee\u6539 \u4f46\u662ffinal\u53d8\u91cf\u4e0d\u53ef\u4ee5\u88ab\u4fee\u6539
\n 
\n <\/p>\n

\u591a\u6001<\/strong><\/h1>\n

\u591a\u6001\uff1a\u53ef\u4ee5\u7406\u89e3\u4e3a\u4e8b\u7269\u5b58\u5728\u7684\u591a\u79cd\u4f53\u73b0\u5f62\u6001
\n1.\u591a\u6001\u7684\u4f53\u73b0
\n\u7236\u7c7b\u7684\u5f15\u7528\u6307\u5411\u4e86\u81ea\u5df1\u7684\u5b50\u7c7b\u5bf9\u8c61\u3002\u7236\u7c7b\u7684\u5f15\u7528\u4e5f\u53ef\u4ee5\u63a5\u6536\u81ea\u5df1\u7684\u5b50\u7c7b\u5bf9\u8c61 \u3002
\n2.\u591a\u6001\u7684\u524d\u63d0
\n\u5fc5\u987b\u662f\u7c7b\u4e0e\u7c7b\u4e4b\u95f4\u6709\u5173\u7cfb\uff0c\u8981\u4e48\u7ee7\u627f\uff0c\u8981\u4e48\u5b9e\u73b0\u3002\u901a\u5e38\u8fd8\u6709\u4e00\u4e2a\u524d\u63d0\uff0c\u5c31\u662f\u5b58\u5728\u8986\u76d6\u3002
\n3.\u591a\u6001\u7684\u597d\u5904
\n\u591a\u6001\u7684\u51fa\u73b0\u5927\u5927\u7684\u63d0\u9ad8\u4e86\u7a0b\u5e8f\u7684\u6269\u5c55\u6027
\n4.\u591a\u6001\u7684\u5f0a\u7aef
\n\u63d0\u9ad8\u4e86\u6269\u5c55\u6027\uff0c\u4f46\u662f\u53ea\u80fd\u4f7f\u7528\u7236\u7c7b\u7684\u5f15\u7528\u8bbf\u95ee\u7236\u7c7b\u4e2d\u7684\u6210\u5458\u3002
\n5.\u591a\u6001\u7684\u5e94\u7528
\nex:\u4e3b\u677fPCI\u00a0\u00a0 \u6570\u636e\u5e93Dao\u7c7b\u3002
\n6.\u591a\u6001\u7684\u51fa\u73b0\u4ee3\u7801\u4e2d\u7684\u7279\u70b9\uff08\u591a\u6001\u4f7f\u7528\u7684\u6ce8\u610f\u4e8b\u9879\uff09
\n 
\n\u5728\u591a\u6001\u4e2d\uff08\u7236\u7c7b\u6307\u5411\u5b50\u7c7b\u5bf9\u8c61\uff09\u975e\u9759\u6001\u6210\u5458\u51fd\u6570\u7684\u7279\u70b9\uff1a\uff08\u975e\u9759\u6001\u624d\u6709override\u7684\u7279\u6027\uff09
\n\u5728\u7f16\u8bd1\u65f6\u671f\uff1a\u53c2\u9605\u5f15\u7528\u578b\u53d8\u91cf\u6240\u5c5e\u7684\u7c7b\u4e2d\u662f\u5426\u6709\u8c03\u7528\u7684\u65b9\u6cd5\uff0c\u5982\u679c\u6709\u7f16\u8bd1\u901a\u8fc7\u5982\u679c\u6ca1\u6709\uff0c\u7f16\u8bd1\u5931\u8d25\u3002
\n\u5728\u8fd0\u884c\u65f6\u671f\uff1a\u53c2\u9605\u5bf9\u8c61\u6240\u5c5e\u7684\u7c7b\u4e2d\u662f\u5426\u6709\u8c03\u7528\u7684\u65b9\u6cd5\u3002
\n\u7b80\u5355\u603b\u7ed3\u5c31\u662f\uff1a\u6210\u5458\u51fd\u6570\u5728\u591a\u6001\u8c03\u7528\u65f6\u7f16\u8bd1\u770b\u5de6\u8fb9\uff0c\u8fd0\u884c\u770b\u53f3\u8fb9\u3002
\n\u5728\u591a\u6001\u4e2d\uff0c\u6210\u5458\u53d8\u91cf\u7684\u7279\u70b9\uff1a
\n\u65e0\u8bba\u7f16\u8bd1\u548c\u8fd0\u884c\u90fd\u53c2\u8003\u5de6\u8fb9\uff08\u5f15\u7528\u578b\u53d8 \u6240\u5c5e\u7684\u7c7b\uff09\u3002
\n\u5728\u591a\u6001\u4e2d\uff0c\u9759\u6001\u6210\u5458\u51fd\u6570\u7684\u7279\u70b9\uff1a
\n\u65e0\u8bba\u7f16\u8bd1\u548c\u8fd0\u884c\u90fd\u53c2\u8003\u5de6\u8fb9\u3002
\n 
\n <\/p>\n

Object<\/strong><\/h1>\n

Object\uff1a\u662f\u6240\u6709\u5bf9\u8c61\u7684\u76f4\u63a5\u6216\u8005\u95f4\u63a5\u7236\u7c7b,\u8be5\u7c7b\u4e2d\u5b9a\u4e49\u7684\u80af\u5b9a\u662f\u6240\u6709\u5bf9\u8c61\u90fd\u5177\u5907\u7684\u529f\u80fd\u3002
\nObject\u7c7b\u4e2d\u5df2\u7ecf\u63d0\u4f9b\u4e86\u5bf9\u5bf9\u8c61\u662f\u5426\u76f8\u540c\u7684\u6bd4\u8f83\u65b9\u6cd5\u3002
\n\u5982\u679c\u81ea\u5b9a\u4e49\u7c7b\u4e2d\u4e5f\u6709\u6bd4\u8f83\u76f8\u540c\u7684\u529f\u80fd\uff0c\u6ca1\u6709\u5fc5\u8981\u91cd\u65b0\u5b9a\u4e49\u3002
\n\u53ea\u8981\u6cbf\u88ad\u7236\u7c7b\u4e2d\u7684\u529f\u80fd\uff0c\u5efa\u7acb\u81ea\u5df1\u7279\u6709\u7684\u6bd4\u8f83\u5185\u5bb9\u6781\u5ba2\uff0c\u8fd9\u5c31\u662f\u8986\u76d6\u3002
\n 
\n <\/p>\n

\u5185\u90e8\u7c7b<\/strong><\/h1>\n

\u5185\u90e8\u7c7b\u7684\u8bbf\u95ee\u89c4\u5219\uff1a
\n1.\u5185\u90e8\u7c7b\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u5916\u90e8\u7c7b\u4e2d\u7684\u6210\u5458\uff0c\u5305\u62ec\u79c1\u6709\u3002\u4e4b\u6240\u4ee5\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u5916\u90e8\u7c7b\u4e2d\u7684\u6210\u5458\uff0c\u662f\u56e0\u4e3a\u5185\u90e8\u7c7b\u4e2d\u6301\u6709\u4e86\u4e00\u4e2a\u5916\u90e8\u7c7b\u7684\u5f15\u7528\u3002\u683c\u5f0f\u00a0 \u5916\u90e8\u7c7b\u540d.this
\n2.\u5916\u90e8\u7c7b\u8981\u8bbf\u95ee\u5185\u90e8\u7c7b\u5fc5\u987b\u5efa\u7acb\u5185\u90e8\u7c7b\u5bf9\u8c61\u3002
\n\u8bbf\u95ee\u683c\u5f0f\uff1a
\n1.\u5f53\u5185\u90e8\u7c7b\u5b9a\u4e49\u5728\u5916\u90e8\u7c7b\u7684\u6210\u5458\u4f4d\u7f6e\u4e0a\uff0c\u800c\u4e14\u975e\u79c1\u6709\uff0c\u53ef\u4ee5\u5728\u5916\u90e8\u5176\u4ed6\u7c7b\uff08Outer\u7c7b\u5916\u5176\u4ed6\u7c7b\uff09\u4e2d\uff0c\u53ef\u4ee5\u76f4\u63a5\u5efa\u7acb\u5185\u90e8\u7c7b\u5bf9\u8c61\u3002
\n\u683c\u5f0f\uff1a\u5916\u90e8\u7c7b\u540d.\u5185\u90e8\u7c7b\u540d \u53d8\u91cf\u540d = \u5916\u90e8\u7c7b\u5bf9\u8c61.\u5185\u90e8\u7c7b\u5bf9\u8c61\u3002
\nOuter.Inner in = new Outer().new Inner();
\n2.\u5f53\u5185\u90e8\u7c7b\u5728\u6210\u5458\u4f4d\u7f6e\u4e0a\uff0c\u5c31\u53ef\u4ee5\u88ab\u6210\u5458\u4fee\u9970\u7b26\u6240\u4fee\u9970\u3002
\n\u6bd4\u5982\uff0cprivate:\u5c06\u5185\u90e8\u7c7b\u5728\u5916\u90e8\u7c7b\u4e2d\u8fdb\u884c\u8fdb\u884c\u5c01\u88c5\u3002
\nstatic \uff1a\u5185\u90e8\u7c7b\u5c31\u5177\u5907\u4e86static\u7684\u7279\u6027\u3002\u5f53\u5185\u90e8\u7c7b\u88ab\u9759\u6001\u4fee\u9970\u540e\uff0c\u53ea\u80fd\u76f4\u63a5\u8bbf\u95ee\u5916\u90e8\u7c7b\u4e2d\u7684\u9759\u6001\u6210\u5458\uff0c\u51fa\u73b0\u4e86\u8bbf\u95ee\u5c40\u9650\u3002
\n\u5728\u5916\u90e8\u4e2d\u5176\u4ed6\u7c7b\u4e2d\uff0c\u5982\u4f55\u76f4\u63a5\u8bbf\u95ee\u9759\u6001\u5185\u90e8\u7c7b\u7684\u975e\u9759\u6001\u6210\u5458\u5462\uff1f
\nnew Outer.Inner().function();
\n\u5728\u5916\u90e8\u4e2d\u5176\u4ed6\u7c7b\u4e2d\uff0c\u5982\u4f55\u76f4\u63a5\u8bbf\u95ee\u9759\u6001\u5185\u90e8\u7c7b\u7684\u9759\u6001\u6210\u5458\u5462\uff1f
\nnew Outer.Inner.function();
\n\u6ce8\u610f\uff1a\u5f53\u5185\u90e8\u7c7b\u4e2d\u5b9a\u4e49\u4e86\u9759\u6001\u6210\u5458\uff0c\u8be5\u5185\u90e8\u7c7b\u5fc5\u987b\u662fstatic\u7684\u3002\u5f53\u5916\u90e8\u7c7b\u4e2d\u7684\u9759\u6001\u65b9\u6cd5\u8bbf\u95ee\u5185\u90e8\u7c7b\u65f6\uff0c\u5185\u90e8\u7c7b\u4e5f\u5fc5\u987b\u662fstatic\u7684\u3002
\n\u5f53\u63cf\u8ff0\u4e8b\u7269\u65f6\uff0c\u4e8b\u7269\u7684\u5185\u90e8\u8fd8\u6709\u4e8b\u7269\uff0c\u8be5\u4e8b\u7269\u7528\u5185\u90e8\u7c7b\u6765\u63cf\u8ff0\u3002\u56e0\u4e3a\u5185\u90e8\u4e8b\u7269\u5728\u4f7f\u7528\u5916\u90e8\u4e8b\u7269\u4e2d\u7684\u5185\u5bb9\u3002
\n\u5185\u90e8\u7c7b\u5b9a\u4e49\u5728\u5c40\u90e8\u65f6\uff1a
\n1.\u4e0d\u53ef\u4ee5\u88ab\u6210\u5458\u4fee\u9970\u7b26\u4fee\u9970\u3002
\n2.\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u5916\u90e8\u7c7b\u4e2d\u6210\u5458\uff0c\u56e0\u4e3a\u8fd8\u6301\u6709\u5916\u90e8\u7c7b\u603b\u7684\u5f15\u7528\uff0c\u4f46\u662f\u4e0d\u53ef\u4ee5\u8bbf\u95ee\u5b83\u6240\u5728\u7684\u5c40\u90e8\u4e2d\u53d8\u91cf\uff0c\u53ea\u80fd\u8bbf\u95ee\u88abfinal\u4fee\u9970\u7684\u5c40\u90e8\u53d8\u91cf\u3002
\n 
\n <\/p>\n

\u533f\u540d\u5185\u90e8\u7c7b<\/strong><\/h1>\n

\u533f\u540d\u5185\u90e8\u7c7b\uff1a
\n1.\u533f\u540d\u5185\u90e8\u7c7b\u5176\u5b9e\u5c31\u662f\u5185\u90e8\u7c7b\u7684\u95f4\u6b47\u683c\u5f0f\u3002
\n2.\u5b9a\u4e49\u533f\u540d\u5185\u90e8\u7c7b\u7684\u524d\u63d0\uff1a\u5185\u90e8\u7c7b\u5fc5\u987b\u662f\u7ee7\u627f\u4e00\u4e2a\u7c7b\u6216\u8005\u5b9e\u73b0\u63a5\u53e3\u3002
\n3.\u533f\u540d\u5185\u90e8\u7c7b\u683c\u5f0f\uff1anew \u7236\u7c7b\u6216\u501f\u53e3\uff5b\u5b9a\u4e49\u5b50\u7c7b\u7684\u5185\u5bb9\uff5d
\n4.\u5176\u5b9e\u533f\u540d\u5185\u90e8\u7c7b\u5c31\u662f\u4e00\u4e2a\u533f\u540d\u5b50\u7c7b\u5bf9\u8c61\uff0c\u800c\u4e14\u8fd9\u4e2a\u5bf9\u8c61\u6709\u70b9\u80d6\u3002\u53ef\u4ee5\u7406\u89e3\u4e3a\u5e26\u5185\u5bb9\u7684\u5bf9\u8c61\u3002
\n5.\u533f\u540d\u5185\u90e8\u7c7b\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\u6700\u597d\u4e0d\u8981\u8d85\u8fc7\u4e09\u4e2a\u3002
\n 
\n <\/p>\n

\u5f02\u5e38<\/strong><\/h1>\n

\u5f02\u5e38\uff1a\u5c31\u662f\u7a0b\u5e8f\u5728\u8fd0\u884c\u65f6\u51fa\u73b0\u4e0d\u6b63\u5e38\u60c5\u51b5\u3002
\n\u5f02\u5e38\u7531\u6765\uff1a\u95ee\u9898\u4e5f\u662f\u73b0\u5b9e\u751f\u6d3b\u4e2d\u7684\u4e00\u4e2a\u5177\u4f53\u7684\u4e8b\u7269\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7java\u7684\u7c7b\u7684\u5f62\u5f0f\u8fdb\u884c\u63cf\u8ff0\uff0c\u5176\u5b9e\u5c31\u662fjava\u5bf9\u4e0d\u6b63\u5e38\u60c5\u51b5\u8fdb\u884c\u63cf\u8ff0\u540e\u7684\u5bf9\u8c61\u4f53\u73b0\u3002
\n\u5bf9\u4e8e\u4e25\u91cd\u7684\uff0cjava\u901a\u8fc7Error\u7c7b\u8fdb\u884c\u63cf\u8ff0\u3002
\n\u5bf9\u4e8eError\u4e00\u822c\u4e0d\u7f16\u5199\u9488\u5bf9\u6027\u7684\u4ee3\u7801\u5bf9\u5176\u8fdb\u884c\u5904\u7406\u3002
\n\u5bf9\u4e8e\u975e\u4e25\u91cd\u7684\uff0cjava\u901a\u8fc7Exception\u7c7b\u8fdb\u884c\u63cf\u8ff0\u3002
\n\u5bf9\u4e8eException\u53ef\u4ee5\u4f7f\u7528\u9488\u5bf9\u6027\u7684\u5904\u7406\u65b9\u5f0f\u8fdb\u884c\u5904\u7406\u3002
\n\u65e0\u8bbaError\u6216\u8005Exception\u90fd\u5177\u6709\u4e00\u4e9b\u5171\u6027\u5185\u5bb9\u3002
\n\u6bd4\u5982\uff1a\u4e0d\u6b63\u5e38\u60c5\u51b5\u7684\u60c5\u51b5\uff0c\u5f15\u53d1\u539f\u56e0\u7b49\u3002
\nThrowable\uff08java\u8bed\u8a00\u4e2d\u6240\u6709\u9519\u8bef\u6216\u5f02\u5e38\u7684\u8d85\u7c7b\uff08\u7236\u7c7b\uff09\uff09
\n|–Error
\n|–Exception
\n2.\u5f02\u5e38\u7684\u5904\u7406
\njava\u63d0\u4f9b\u4e86\u7279\u6709\u7684\u8bed\u53e5\u8fdb\u884c\u5904\u7406\u3002<\/p>\n

try{\n    \u9700\u8981\u88ab\u68c0\u6d4b\u7684\u4ee3\u7801\uff1b\n}catch(\u5f02\u5e38\u7c7b \u53d8\u91cf){\n    \u5904\u7406\u5f02\u5e38\u7684\u4ee3\u7801\uff1b\n}finally{\n    \u4e00\u5b9a\u4f1a\u6267\u884c\u7684\u8bed\u53e5\uff1b\n}<\/pre>\n
3.\u5bf9\u6355\u83b7\u5230\u7684\u5f02\u5e38\u5bf9\u8c61\u8fdb\u884c\u5e38\u89c1\u65b9\u6cd5\u64cd\u4f5c
\nString getMessage()\uff1b\u83b7\u53d6\u5f02\u5e38\u7684\u4fe1\u606f\u3002
\n\u5bf9\u591a\u5f02\u5e38\u7684\u5904\u7406\u3002
\n1.\u58f0\u660e\u5f02\u5e38\u65f6\uff0c\u5efa\u8bae\u58f0\u660e\u66f4\u4e3a\u5177\u4f53\u7684\u5f02\u5e38\uff0c\u8fd9\u6837\u5904\u7406\u7684\u53ef\u4ee5\u66f4\u5177\u4f53\u3002
\n2.\u5bf9\u65b9\u58f0\u660e\u51e0\u4e2a\u5f02\u5e38\uff0c\u5c31\u5bf9\u5e94\u6709\u51e0\u4e2acatch\u5757\uff0c\u4e0d\u8981\u5b9a\u4e49\u591a\u4f59\u7684catch\u5757\u3002
\n3.\u5982\u679c\u591a\u4e2acatch\u5757\u4e2d\u7684\u5f02\u5e38\u51fa\u73b0\u7ee7\u627f\u5173\u7cfb\uff0c\u7236\u7c7b\u5f02\u5e38catch\u5757\u653e\u5728\u6700\u4e0b\u9762\u3002
\n\u5efa\u8bae\u5728\u8fdb\u884ccatch\u5904\u7406\u65f6\uff0ccatch\u4e2d\u4e00\u5b9a\u8981\u5b9a\u4e49\u5177\u4f53\u5904\u7406\u65b9\u5f0f\uff0c\u4e0d\u8981\u7b80\u5355\u7684\u5b9a\u4e49\u4e00\u53e5 e.printStackTrace();\u4e5f\u4e0d\u8981\u7b80\u5355\u7684\u5c31\u4e66\u5199\u4e00\u6761\u8f93\u51fa\u8bed\u53e5\u3002
\n 
\n <\/p>\n
\u81ea\u5b9a\u4e49\u5f02\u5e38<\/strong><\/h1>\n
\u56e0\u4e3a\u9879\u76ee\u4e2d\u4f1a\u51fa\u73b0\u7279\u6709\u7684\u95ee\u9898\uff0c\u800c\u8fd9\u4e9b\u95ee\u9898\u5e76\u672a\u88abjava\u6240\u63cf\u8ff0\u5e76\u8fdb\u884c\u5c01\u88c5\u3002\u6240\u4ee5\u5bf9\u4e8e\u8fd9\u4e9b\u7279\u6709\u7684\u95ee\u9898\u53ef\u4ee5\u6309\u7167java\u7684\u5bf9\u95ee\u9898\u7684\u5c01\u88c5\u601d\u60f3\u3002\u5c06\u7279\u6709\u7684\u95ee\u9898\uff0c\u8fdb\u884c\u81ea\u5b9a\u4e49\u7684\u5f02\u5e38\u5c01\u88c5\u3002
\n\u81ea\u5b9a\u4e49\u5f02\u5e38
\n\u5f53\u5728\u51fd\u6570\u5185\u90e8\u51fa\u73b0\u4e86throw\u629b\u51fa\u5f02\u5e38\u5bf9\u8c61\uff0c\u90a3\u4e48\u5fc5\u987b\u8981\u7ed9\u5bf9\u5e94\u7684\u5904\u7406\u52a8\u4f5c\u3002
\n\u8981\u4e48\u5728\u5185\u90e8 try catch\u5904\u7406\u3002
\n\u8981\u4e48\u5728\u51fd\u6570\u4e0a\u58f0\u660e\u8ba9\u8c03\u7528\u8005\u5904\u7406\u3002
\n\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u5728\u51fd\u6570\u5185\u51fa\u73b0\u5f02\u5e38\uff0c\u51fd\u6570\u4e0a\u9700\u8981\u58f0\u660e\u3002
\n\u5982\u4f55\u5b9a\u4e49\u5f02\u5e38\u4fe1\u606f\uff1f
\n\u56e0\u4e3a\u7236\u7c7b\u4e2d\u5df2\u7ecf\u628a\u5f02\u5e38\u4fe1\u606f\u7684\u64cd\u4f5c\u90fd\u5b8c\u6210\u4e86\uff0c\u6240\u4ee5\u5b50\u7c7b\u53ea\u8981\u5728\u6784\u9020\u65f6\uff0c\u5c06\u5f02\u5e38\u4fe1\u606f\u4f20\u9012\u7ed9\u7236\u7c7b\u901a\u8fc7super\u8bed\u53e5\u3002\u90a3\u4e48\u5c31\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7getMessage\u65b9\u6cd5\u83b7\u53d6\u81ea\u5b9a\u4e49\u7684\u5f02\u5e38\u4fe1\u606f\u3002
\n\u81ea\u5b9a\u4e49\u5f02\u5e38\u5fc5\u987b\u662f\u81ea\u5b9a\u4e49\u7c7b\u96c6\u6210Exception
\n\u7ee7\u627fException\u539f\u56e0
\n\u5f02\u5e38\u4f53\u7cfb\u53c8\u4e00\u4e2a\u7279\u70b9\uff1a\u56e0\u4e3a\u5f02\u5e38\u7c7b\u548c\u5f02\u5e38\u5bf9\u8c61\u90fd\u9700\u8981\u88ab\u629b\u51fa\uff0c\u4ed6\u4eec\u90fd\u5177\u5907\u53ef\u629b\u6027\u8fd9\u4e2a\u53ef\u629b\u6027\u662fThrowable\u8fd9\u4e2a\u4f53\u7cfb\u4e2d\u72ec\u6709\u7684\u7279\u70b9\u3002\u53ea\u6709\u8fd9\u4e2a\u4f53\u7cfb\u4e2d\u7684\u7c7b\u548c\u5bf9\u8c61\u624d\u53ef\u88abthrow\u548cthrows\u64cd\u4f5c
\nthrow\u548cthrows\u7684\u533a\u522b
\n1.throws\u4f7f\u7528\u5728\u51fd\u6570\u4e0a\uff0cthrow\u4f7f\u7528\u5728\u51fd\u6570\u5185\u3002
\n2.throws\u540e\u9762\u8ddf\u7684\u7684\u5f02\u5e38\u7c7b\uff0c\u53ef\u4ee5\u8ddf\u591a\u4e2a\uff0c\u7528\u201c\uff0c\u201d\u9694\u5f00\uff0cthrow\u540e\u9762\u8ddf\u7684\u662f\u5f02\u5e38\u5bf9\u8c61\u3002
\nException\u4e2d\u53c8\u4e00\u4e2a\u7279\u6b8a\u7684\u5b50\u7c7b\u5f02\u5e38\u53eb\u505aRuntimeException
\n\u5982\u679c\u5728\u51fd\u6570\u5185\u629b\u51fa\u8be5\u5f02\u5e38\uff0c\u51fd\u6570\u4e0a\u53ef\u4ee5\u4e0d\u7528\u58f0\u660e\uff0c\u7f16\u8bd1\u4e00\u6837\u901a\u8fc7
\n\u5982\u679c\u5728\u51fd\u6570\u4e0a\u58f0\u660e\u4e86\u8be5\u5f02\u5e38\uff0c\u8c03\u7528\u8005\u53ef\u4ee5\u4e0d\u7528\u8fdb\u884c\u5904\u7406\uff0c\u7f16\u8bd1\u4e00\u6837\u901a\u8fc7
\n\u4e4b\u6240\u4ee5\u4e0d\u7528\u5728\u51fd\u6570\u58f0\u660e\uff0c\u662f\u56e0\u4e3a\u4e0d\u9700\u8981\u8ba9\u8c03\u7528\u8005\u5904\u7406
\n\u5f53\u8be5\u5f02\u5e38\u53d1\u751f\uff0c\u5e0c\u671b\u7a0b\u5e8f\u505c\u6b62\uff0c\u56e0\u4e3a\u5728\u8fd0\u884c\u65f6\uff0c\u51fa\u73b0\u4e86\u65e0\u6cd5\u7ee7\u7eed\u8fd0\u7b97\u7684\u60c5\u51b5\uff0c\u5e0c\u671b\u505c\u6b62\u7a0b\u5e8f\u540e\u7a0b\u5e8f\u5458\u5bf9\u8be5\u4ee3\u7801\u8fdb\u884c\u4fee\u6b63\u3002
\n\u81ea\u5b9a\u4e49\u5f02\u5e38\u65f6\uff1a\u5982\u679c\u8be5\u5f02\u5e38\u7684\u53d1\u751f\uff0c\u65e0\u6cd5\u518d\u7ee7\u7eed\u8fdb\u884c\u8fd0\u7b97\uff0c\u5c31\u8ba9\u81ea\u5b9a\u4e49\u5f02\u5e38\u7ee7\u627fRuntimeException\u3002
\n\u5bf9\u4e8e\u5f02\u5e38\u5206\u4e3a\u4e24\u79cd\uff1a
\n1.\u7f16\u8bd1\u65f6\u88ab\u68c0\u6d4b\u7684\u5f02\u5e38
\n2.\u7f16\u8bd1\u65f6\u4e0d\u88ab\u76d1\u6d4b\u7684\u5f02\u5e38\uff08\u8fd0\u884c\u65f6\u5f02\u5e38\u3002RuntimeException\u4ee5\u53ca\u5176\u5b50\u7c7b\uff09
\nfinally\u4ee3\u7801\u5757\uff1a\u5b9a\u4e49\u4e00\u5b9a\u6267\u884c\u7684\u4ee3\u7801\u3002\u901a\u5e38\u7528\u4e8e\u5173\u95ed\u8d44\u6e90\u3002
\n\u5f02\u5e38\u5728\u5b50\u7236\u7c7b\u8986\u76d6\u4e2d\u7684\u4f53\u73b0\uff1a
\n1.\u5b50\u7c7b\u6b63\u5728\u8986\u76d6\u7236\u7c7b\u65f6\uff0c\u5982\u679c\u7236\u7c7b\u7684\u65b9\u6cd5\u629b\u51fa\u5f02\u5e38\uff0c\u90a3\u4e48\u5b50\u7c7b\u7684\u8986\u76d6\u65b9\u6cd5\uff0c\u53ea\u80fd\u629b\u51fa\u7236\u7c7b\u7684\u5f02\u5e38\u6216\u8005\u8be5\u5f02\u5e38\u7684\u5b50\u7c7b\u3002<\/p>\n
Exception\n    |---AException\n        |---BException\n    |---CException\n  \/\/\u5982\u679c\u7236\u7c7b\u629b\u51faA\u5f02\u5e38\uff0c\u5b50\u7c7b\u53ea\u80fd\u629b\u51faA\u6216B\u5f02\u5e38<\/pre>\n
2.\u5982\u679c\u7236\u7c7b\u65b9\u6cd5\u629b\u51fa\u591a\u4e2a\u5f02\u5e38\uff0c\u90a3\u4e48\u5b50\u7c7b\u5728\u8986\u76d6\u65b9\u6cd5\u65f6\uff0c\u53ea\u80fd\u629b\u51fa\u7236\u7c7b\u5f02\u5e38\u7684\u5b50\u96c6\u3002
\n3.\u5982\u679c\u7236\u7c7b\u6216\u8005\u63a5\u53e3\u7684\u65b9\u6cd5\u4e2d\uff0c\u6ca1\u6709\u5f02\u5e38\u629b\u51fa\uff0c\u90a3\u4e48\u5b50\u7c7b\u5728\u8986\u76d6\u65b9\u6cd5\u65f6\uff0c\u4e5f\u4e0d\u53ef\u4ee5\u629b\u51fa\u5f02\u5e38\u3002\u5982\u679c\u5b50\u7c7b\u65b9\u6cd5\u53d1\u751f\u4e86\u5f02\u5e38\u5c31\u4e00\u5b9a\u8981\u8fdb\u884ctry\u5904\u7406\uff0c\u7edd\u5bf9\u4e0d\u80fd\u629b\u3002<\/p>\n
\u5f02\u5e38\u7684\u603b\u7ed3<\/h3>\n
\u5f02\u5e38\u662f\u4ec0\u4e48\uff1f
\n\u5f02\u5e38\u662f\u5bf9\u95ee\u9898\u7684\u63cf\u8ff0\uff0c\u5c06\u95ee\u9898\u8fdb\u884c\u5bf9\u8c61\u7684\u5c01\u88c5\u3002
\n\u5f02\u5e38\u4f53\u7cfb<\/p>\n
Throwable\n    |---Error\n    |---Exception\n        |---RuntimeException<\/pre>\n
 
\n\u5f02\u5e38\u4f53\u7cfb\u7684\u7279\u70b9
\n1.\u5f02\u5e38\u4f53\u7cfb\u4e2d\u7684\u6240\u6709\u7c7b\u4ee5\u53ca\u5efa\u7acb\u7684\u5bf9\u8c61\u90fd\u5177\u5907\u53ef\u629b\u6027\u3002
\n2.\u4e5f\u5c31\u662f\u8bf4\u53ef\u4ee5\u88abthrow\u548cthrows\u6240\u64cd\u4f5c\u3002
\n3.\u53ea\u6709\u5f02\u5e38\u4f53\u7cfb\u5177\u5907\u8fd9\u4e2a\u7279\u70b9
\nthrow\u548cthrows\u7684\u7528\u6cd5\uff1a
\nthrow\u5b9a\u4e49\u5728\u51fd\u6570\u5185\uff0c\u7528\u4e8e\u629b\u51fa\u5f02\u5e38\u5bf9\u8c61
\nthrows\u5b9a\u4e49\u5728\u51fd\u6570\u4e0a\uff0c\u7528\u4e8e\u629b\u51fa\u5f02\u5e38\u7c7b\uff0c\u53ef\u4ee5\u629b\u51fa\u591a\u4e2a\u7528\u9017\u53f7\u9694\u5f00\u3002
\n\u5f53\u51fd\u6570\u5185\u6709throws\u629b\u51fa\u5f02\u5e38\u5bf9\u8c61\uff0c\u5e76\u672a\u8fdb\u884ctry\u5904\u7406\uff0c\u5fc5\u987b\u8981\u5728\u51fd\u6570\u4e0a\u58f0\u660e\uff0c\u5426\u5219\u7f16\u8bd1\u5931\u8d25\u3002
\n\u6ce8\u610f\uff1aRuntimeException\u9664\u5916\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u51fd\u6570\u5185\u5982\u679c\u629b\u51faRuntimeException\u5f02\u5e38\uff0c\u51fd\u6570\u4e0a\u53ef\u4ee5\u4e0d\u7528\u58f0\u660e
\n\u5982\u679c\u51fd\u6570\u58f0\u660e\u4e86\u5f02\u5e38\uff0c\u8c03\u7528\u8005\u9700\u8981\u8fdb\u884c\u5904\u7406\uff0c\u5904\u7406\u65b9\u5f0f\u53efthrows\u53eftry\u3002
\n\u5f02\u5e38\u6709\u4e24\u79cd\uff1a
\n\u7f16\u8bd1\u65f6\u88ab\u68c0\u6d4b\u5f02\u5e38\uff1a
\n\u8be5\u5f02\u5e38\u5728\u7f16\u8bd1\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u5904\u7406\uff08\u6ca1\u6709throws\u4e5f\u6ca1\u6709try\uff09\u90a3\u4e48\u7f16\u8bd1\u5931\u8d25
\n\u8be5\u5f02\u5e38\u88ab\u6807\u8bc6\u4ee3\u8868\u7740\u53ef\u4ee5\u88ab\u5904\u7406\u3002
\n\u8fd0\u884c\u65f6\u5f02\u5e38\uff08\u7f16\u8bd1\u65f6\u4e0d\u68c0\u6d4b\uff09\uff1a
\n\u5728\u7f16\u8bd1\u65f6\u4e0d\u9700\u8981\u5904\u7406\uff0c\u7f16\u8bd1\u5668\u4e0d\u68c0\u67e5
\n\u8be5\u5f02\u5e38\u53d1\u751f\uff0c\u5efa\u8bae\u4e0d\u5904\u7406\uff0c\u8ba9\u7a0b\u5e8f\u505c\u6b62\uff0c\u9700\u8981\u5bf9\u4ee3\u7801\u8fdb\u884c\u4fee\u6b63\u3002
\n\u5f02\u5e38\u5904\u7406\u7684\u8bed\u53e5\uff1a
\n 
\n\u6709\u4e09\u79cd\u7ed3\u5408\u7684\u65b9\u5f0f\u00a0\u00a0 try catch\u3001try catch finally\u3001try finally\u3002
\n\u6ce8\u610f\uff1a
\n1.finally\u4e2d\u901a\u5e38\u5b9a\u4e49\u7684\u662f\u5173\u95ed\u8d44\u6e90\u4ee3\u7801\uff0c\u56e0\u4e3a\u8d44\u6e90\u5fc5\u987b\u8981\u91ca\u653e
\n2.finally\u53ea\u6709\u4e00\u79cd\u60c5\u51b5\u4e0d\u4f1a\u6267\u884c\uff0c\u5f53\u6267\u884c\u5230System.exit\uff080\uff09\uff08jvm\u7cfb\u7edf\u9000
\n\u51fa\uff09\uff0cfinally\u4e0d\u4f1a\u88ab\u8fd0\u884c\u3002
\n\u81ea\u5b9a\u4e49\u5f02\u5e38\uff1a
\n\u5b9a\u4e49\u7c7b\u7ee7\u627fException\u6216\u8005RuntimeException
\n1.\u662f\u4e3a\u4e86\u8ba9\u8be5\u81ea\u5b9a\u4e49\u7c7b\u5177\u5907\u53ef\u629b\u6027
\n2.\u8ba9\u8be5\u7c7b\u5177\u5907\u64cd\u4f5c\u5f02\u5e38\u7684\u5171\u6027\u65b9\u6cd5
\n\u5f53\u8981\u5b9a\u4e49\u81ea\u5b9a\u4e49\u5f02\u5e38\u7684\u4fe1\u606f\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u7236\u7c7b\u5df2\u7ecf\u5b9a\u4e49\u597d\u7684\u529f\u80fd\u3002
\n\u5f02\u5e38\u4fe1\u606f\u4f20\u9012\u7ed9\u7236\u7c7b\u7684\u6784\u9020\u51fd\u6570
\n\u81ea\u5b9a\u5f02\u5e38\uff1a
\n\u6309\u7167java\u7684\u9762\u5411\u5bf9\u8c61\u601d\u60f3\uff0c\u5c06\u7a0b\u5e8f\u4e2d\u51fa\u73b0\u7684\u7279\u6709\u95ee\u9898\u8fdb\u884c\u5c01\u88c5\u3002
\n\u5f02\u5e38\u7684\u597d\u5904\uff1a
\n1.\u8bb2\u95ee\u9898\u8fdb\u884c\u5c01\u88c5
\n2.\u8bb2\u5f02\u5e38\u6d41\u7a0b\u4ee3\u7801\u548c\u95ee\u9898\u5904\u7406\u4ee3\u7801\u76f8\u5206\u79bb\uff0c\u65b9\u4fbf\u9605\u8bfb\u3002
\n\u5f02\u5e38\u7684\u5904\u7406\u539f\u5219\uff1a
\n1.\u5904\u7406\u65b9\u5f0f\u6709\u4e24\u79cd\uff1atry\u6216\u8005throw
\n2.\u8c03\u7528\u5230\u629b\u51fa\u5f02\u5e38\u7684\u529f\u80fd\u65f6\uff0c\u629b\u51fa\u51e0\u4e2a\uff0c\u5c31\u5904\u7406\u51e0\u4e2a\u3002\u4e00\u4e2atrt\u5bf9\u5e94\u591a\u4e2acatch\u3002
\n3.\u591a\u4e2acatch\uff0c\u7236\u7c7b\u7684catch\u653e\u5230\u6700\u4e0b\u9762\u3002
\n4.catch\u5185\u9700\u8981\u5b9a\u4e49\u9488\u5bf9\u6027\u7684\u5904\u7406\u65b9\u5f0f\uff0c\u4e0d\u8981\u7b80\u5355\u7684\u5b9a\u4e49printStackTrace\uff0c\u6216\u8005\u8f93\u51fa\u3000\u3000\u3000\u8bed\u53e5\uff0c\u4e5f\u4e0d\u8981\u4e0d\u5199\u3002\u5f53\u6355\u83b7\u5230\u7684\u5f02\u5e38\uff0c\u672c\u529f\u80fd\u5904\u7406\u4e0d\u4e86\u65f6\uff0c\u53ef\u4ee5\u7ee7\u7eed\u5728catch\u3000throw\u3002<\/p>\n
try{\n    throw new AException()\uff1b\n}catch(AException e){\n    throw e;\n}<\/pre>\n
 
\n\u5982\u679c\u8be5\u5f02\u5e38\u5904\u7406\u4e0d\u4e86\uff0c\u4f46\u662f\u5e76\u4e0d\u5c5e\u4e8e\u8be5\u529f\u80fd\u51fa\u73b0\u7684\u5f02\u5e38\uff0c\u53ef\u4ee5\u5c06\u5f02\u5e38\u8f6c\u6362\u540e\uff0c\u5728\u629b\u51fa\u548c\u8be5\u529f\u80fd\u76f8\u5173\u7684\u5f02\u5e38,\u6216\u8005\u5f02\u5e38\u53ef\u4ee5\u5904\u7406\uff0c\u5f53\u9700\u8981\u5c06\u5f02\u5e38\u4ea7\u751f\u7684\u548c\u672c\u529f\u80fd\u76f8\u5173\u7684\u95ee\u9898\u63d0\u4f9b\u51fa\u53bb\u3002
\n\u8ba9\u8c03\u7528\u8005\u77e5\u9053\uff0c\u5e76\u5904\u7406\uff0c\u4e5f\u53ef\u4ee5\u5c06\u6355\u83b7\u5f02\u5e38\u5904\u7406\u540e\uff0c\u8f6c\u6362\u65b0\u7684\u5f02\u5e38\u3002<\/p>\n
try{\n    throw new AException()\uff1b\n}catch(AException e){\n    throw new BException;\n}<\/pre>\n
\u6bd4\u5982\u6c47\u6b3e\u7684\u4f8b\u5b50
\n\u5f02\u5e38\u7684\u6ce8\u610f\u4e8b\u9879\uff1a
\n\u5728\u5b50\u7c7b\u8986\u76d6\u65f6\uff1a
\n1.\u5b50\u7c7b\u629b\u51fa\u7684\u5f02\u5e38\u5fc5\u987b\u662f\u7236\u7c7b\u629b\u51fa\u5f02\u5e38\u7684\u5b50\u7c7b\u6216\u8005\u5b50\u96c6\u3002
\n2.\u5982\u679c\u7236\u7c7b\u6216\u8005\u501f\u53e3\u6ca1\u6709\u5f02\u5e38\u629b\u51fa\u65f6\uff0c\u5b50\u7c7b\u8986\u76d6\u51fa\u73b0\u5f02\u5e38\u53ea\u80fdtry\u4e0d\u80fdthrows
\n 
\n <\/p>\n
\u5305\uff08package\uff09<\/strong><\/h1>\n
1.\u5bf9\u7c7b\u6587\u4ef6\u8fdb\u884c\u5206\u7c7b\u7ba1\u7406
\n2.\u7ed9\u7c7b\u63d0\u4f9b\u591a\u5c42\u547d\u540d\u7a7a\u95f4
\n3.\u5199\u5728\u7a0b\u5e8f\u6587\u4ef6\u7684\u7b2c\u4e00\u884c
\n4.\u7c7b\u540d\u7684\u5168\u79f0\u662f\u5305\u540d.\u7c7b\u540d
\n5.\u5305\u4e5f\u662f\u4e00\u79cd\u5c01\u88c5\u7684\u5f62\u5f0f
\n\u603b\u7ed3\uff1a
\n\u5305\u4e0e\u5305\u4e4b\u95f4\u8fdb\u884c\u8bbf\u95ee\uff0c\u88ab\u8bbf\u95ee\u7684\u5305\u4e2d\u7684\u7c7b\u4ee5\u53ca\u7c7b\u4e2d\u7684\u6210\u5458\uff0c\u9700\u8981public\u4fee\u9970\u3002
\n\u4e0d\u540c\u5305\u4e2d\u7684\u5b50\u7c7b\u8fd8\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u7236\u7c7b\u4e2d\u88abprotected\u6743\u9650\u4fee\u9970\u7684\u6210\u5458\u3002
\n\u5305\u4e0e\u5305\u4e4b\u95f4\u53ef\u4ee5\u4f7f\u7528\u7684\u6743\u9650\u53ea\u6709\u4e24\u79cd\u00a0 public\u00a0 protected
\n <\/p>\n
public\u3000\u3000\u3000\u3000\u3000protected\u3000\u3000\u3000protect\u3000\u3000default\uff08\u9ed8\u8ba4\uff09\u3000\u3000\u3000private\n\u540c\u4e00\u4e2a\u7c7b\u4e2d\u3000\u3000\u3000\u3000ok\u3000\u3000\u3000\u3000\u3000\u3000ok\u3000\u3000\u3000\u3000\u3000\u3000ok           \u3000\u3000\u3000ok\n\u7528\u4e00\u4e2a\u5305\u4e2d\u3000\u3000\u3000\u3000ok\u3000\u3000\u3000\u3000\u3000\u3000ok\u3000\u3000\u3000\u3000\u3000\u3000ok\n\u5b50\u7c7b\u3000\u3000\u3000\u3000\u3000\u3000\u3000ok\u3000\u3000\u3000\u3000\u3000\u3000ok\n\u4e0d\u540c\u5305\u4e2d\u3000\u3000\u3000\u3000\u3000ok<\/pre>\n
import\uff1a
\n\u5bfc\u5165 \u7684\u662f\u5305\u4e2d\u7684\u7c7b
\n\u5efa\u8bae\uff1a\u4e0d\u8981\u5199\u901a\u914d\u7b26\u201c*\u201d\uff0c\u7528\u4ec0\u4e48\u5199\u4ec0\u4e48
\n\u5efa\u7acb\u5305\u540d\u4e0d\u8981\u91cd\u590d\uff0c\u53ef\u4ee5\u4f7f\u7528url\u6765\u5b8c\u6210\u5b9a\u4e49\uff0curl\u662f\u552f\u4e00\u7684\u3002
\n 
\n <\/p>\n
\u591a\u7ebf\u7a0b<\/strong><\/h1>\n
\u8fdb\u7a0b\uff1a\u662f\u4e00\u4e2a\u6b63\u5728\u6267\u884c\u4e2d\u7684\u7a0b\u5e8f\uff0c\u6ca1\u4e00\u4e2a\u8fdb\u7a0b\u6267\u884c\u90fd\u6709\u4e00\u4e2a\u6267\u884c\u987a\u5e8f\uff0c\u8be5\u987a\u5e8f\u662f\u4e00\u4e2a\u6267\u884c\u8def\u5f84\uff0c\u6216\u8005\u53eb\u4e00\u4e2a\u63a7\u5236\u5355\u5143
\n\u7ebf\u7a0b\uff1a\u5c31\u662f\u8fdb\u7a0b\u4e2d\u7684\u4e00\u4e2a\u72ec\u7acb\u7684\u63a7\u5236\u5355\u5143\uff0c\u7ebf\u7a0b\u63a7\u5236\u7740\u8fdb\u7a0b\u7684\u6267\u884c
\n\u4e00\u4e2a\u8fdb\u7a0b\u4e2d\u81f3\u5c11\u6709\u6709\u4e00\u4e2a\u7ebf\u7a0b
\njava VM \u542f\u52a8\u7684\u65f6\u5019\u4f1a\u6709\u4e00\u4e2a\u8fdb\u7a0b\u53eb\u505ajava.exe\u3002
\n\u8be5\u8fdb\u7a0b\u4e2d\u81f3\u5c11\u6709\u4e00\u4e2a\u7ebf\u7a0b\u5728\u8d1f\u8d23java\u7a0b\u5e8f\u7684\u6267\u884c\uff0c\u800c\u4e14\u8fd9\u4e2a\u7ebf\u7a0b\u8fd0\u884c\u7684\u4ee3\u7801\u5b58\u5728\u4e8emain\u65b9\u6cd5\u4e2d\uff0c\u8be5\u7ebf\u7a0b\u79f0\u4e4b\u4e3a\u4e3b\u7ebf\u7a0b\u3002
\n\u6269\u5c55\uff1a\u5176\u5b9e\u66f4\u7ec6\u8282\u8bf4\u660ejvm\uff0cjvm\u542f\u52a8\u4e0d\u6b62\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u8fd8\u6709\u8d1f\u8d23\u5783\u573e\u56de\u6536\u673a\u5236\u7684\u7ebf\u7a0b\u3002
\n1.\u5982\u4f55\u5728\u81ea\u5b9a\u4e49\u7684\u4ee3\u7801\u4e2d\uff0c\u81ea\u5b9a\u4e49\u4e00\u4e2a\u7ebf\u7a0b\u5462\uff1f
\n\u901a\u8fc7\u5bf9api\u7684\u67e5\u627e\uff0cjava\u5df2\u7ecf\u63d0\u4f9b\u4e86\u5bf9\u7ebf\u7a0b\u8fd9\u7c7b\u4e8b\u7269\u7684\u63cf\u8ff0\uff0c\u5c31Thread\u7c7b
\n\u521b\u5efa\u7ebf\u7a0b\u7684\u7b2c\u4e00\u79cd\u65b9\u5f0f\uff1a\u7ee7\u627fThread\u7c7b\u3002
\n\u6b65\u9aa4\uff1a
\n1.\u5b9a\u4e49\u7c7b\u7ee7\u627fThread
\n2.\u590d\u5199Thread\u7c7b\u4e2d\u7684run\u65b9\u6cd5\u3002\u76ee\u7684\uff1a\u5c06\u81ea\u5b9a\u4e49\u7684\u4ee3\u7801\u5b58\u50a8\u5728run\u65b9\u6cd5\u6c47\u603b\uff0c\u8ba9\u7ebf\u7a0b\u8fd0\u884c\u3002
\n3.\u8c03\u7528\u7ebf\u7a0b\u7684start\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u6709\u4e24\u4e2a\u4f5c\u7528\uff0c
\n\u53d1\u73b0\u8fd0\u884c\u7ed3\u679c\u6bcf\u4e00\u6b21\u90fd\u4e0d\u540c
\n\u56e0\u4e3a\u591a\u4e2a\u7ebf\u7a0b\u90fd\u83b7\u53d6cpu\u7684\u6267\u884c\u6743\uff0ccpu\u6267\u884c\u5230\u8c01\uff0c\u8c01\u5c31\u8fd0\u884c\u660e\u786e\u4e00\u70b9\uff0c\u5728\u67d0\u4e00\u65f6\u523b\uff0c\u53ea\u80fd\u53c8\u4e00\u4e2a\u7a0b\u5e8f\u5728\u8fd0\u884c\uff0c\uff08\u591a\u6838\u9664\u5916\uff09\uff0ccpu\u5728\u505a\u7740\u5feb\u901f\u7684\u5207\u6362\uff0c\u4ee5\u8fbe\u5230\u770b\u4e0a\u53bb\u662f\u540c\u65f6\u8fd0\u884c\u7684\u6548\u679c\u3002
\n\u6211\u4eec\u53ef\u4ee5\u5f62\u8c61\u7684\u628a\u591a\u7ebf\u7a0b\u7684\u8fd0\u884c\u884c\u4e3a\u5728\u4e92\u76f8\u62a2\u593acpu\u7684\u6267\u884c\u6743\u3002
\n\u8fd9\u5c31\u662f\u591a\u7ebf\u7a0b\u7684\u4e00\u4e2a\u7279\u6027\uff0c\u968f\u673a\u6027\uff0c\u8c01\u62a2\u5230\u8c01\u6267\u884c\uff0c\u81f3\u4e8e\u6267\u884c\u591a\u957f\u65f6\u95f4\uff0ccpu\u8bf4\u7684\u7b97\u3002
\n\u4e3a\u4ec0\u4e48\u8981\u8986\u76d6run\u65b9\u6cd5\u5462\uff1f
\nThread\u7c7b\u7528\u4e8e\u63cf\u8ff0\u7ebf\u7a0b\u3002
\n\u8be5\u7c7b\u5b9a\u4e49\u4e86\u4e00\u4e2a\u529f\u80fd\uff0c\u7528\u4e8e\u5b58\u50a8\u7ebf\u7a0b\u8981\u8fd0\u884c\u7684\u4ee3\u7801\uff0c\u8be5\u5b58\u50a8\u529f\u80fd\u5c31\u662frun\u65b9\u6cd5\u3002
\n\u4e5f\u5c31\u662f\u8bf4Thread\u7c7b\u4e2d\u7684run\u65b9\u6cd5\uff0c\u662f\u7528\u4e8e\u5b58\u50a8\u7ebf\u7a0b\u8981\u8fd0\u884c\u7684\u4ee3\u7801\u3002
\nstatic Thread currentThread\uff08\uff09\uff1b\u83b7\u53d6\u5f53\u524d\u7ebf\u7a0b\u5bf9\u8c61
\ngetName\uff08\uff09\uff1b\u83b7\u53d6\u7ebf\u7a0b\u7684\u540d\u79f0\u3002
\n\u8bbe\u7f6e\u7ebf\u7a0b\u7684\u540d\u79f0\uff1asetName\u6216\u8005\u6784\u9020\u51fd\u6570\u3002
\n\u521b\u5efa\u7ebf\u7a0b\u7684\u7b2c\u4e8c\u79cd\u65b9\u5f0f\uff1a\u5b9e\u73b0Runnable\u63a5\u53e3
\n\u6b65\u9aa4\uff1a
\n1.\u5b9a\u4e49\u7c7b\u5b9e\u73b0Runnable\u63a5\u53e3\u3002
\n2.\u8986\u76d6Runnable\u63a5\u53e3\u4e2d\u7684run\u65b9\u6cd5\u3002\u5c06\u5ba3\u79f0\u8981\u8fd0\u884c\u7684\u4ee3\u7801\u5b58\u653e\u5728run\u65b9\u6cd5\u4e2d
\n3.\u901a\u8fc7Thread\u7c7b\u5efa\u7acb\u7ebf\u7a0b\u5bf9\u8c61\u3002
\n4.\u5c06Runnable\u63a5\u53e3\u7684\u5b50\u7c7b\u5bf9\u8c61\u4f5c\u4e3a\u5b9e\u9645\u53c2\u6570\u4f20\u9012\u7ed9Thread\u7c7b\u7684\u6784\u9020\u51fd\u6570\u3002\u4e3a\u4ec0\u4e48\u8981\u8bb2Runnable\u63a5\u53e3\u7684\u5b50\u7c7b\u5bf9\u8c61\u4f20\u9012\u7ed9Thread\u7684\u6784\u9020\u51fd\u6570\u56e0\u4e3a\u81ea\u5b9a\u4e49\u7684run\u65b9\u6cd5\u6240\u5c5e\u7684\u5bf9\u8c61\u662fRunnable\u63a5\u53e3\u7684\u5b50\u7c7b\u5bf9\u8c61\u3002\u6240\u4ee5\u8981\u8ba9\u7ebf\u7a0b\u53bb\u6267\u884c\u6307\u5b9a\u5bf9\u8c61\u7684run\u65b9\u6cd5\uff0c\u5c31\u5fc5\u987b\u660e\u786e\u8be5run\u65b9\u6cd5\u6240\u5c5e\u7684\u5bf9\u8c61
\n5.\u8c03\u7528Thread\u7c7b\u7684start\u65b9\u6cd5\u5f00\u542f\u7ebf\u7a0b\u5e76\u8c03\u7528Runnable\u63a5\u53e3\u5b50\u7c7b\u7684run\u65b9\u6cd5\u3002
\n\u5b9e\u73b0\u65b9\u5f0f\u548c\u7ee7\u627f\u65b9\u5f0f\u6709\u4ec0\u4e48\u533a\u522b\uff1a
\n\u5b9e\u73b0\u65b9\u5f0f\u597d\u5904\uff0c\u907f\u514d\u4e86\u5355\u7ee7\u627f\u7684\u5c40\u9650\u6027\u3002\u5728\u5b9a\u4e49\u7ebf\u7a0b\u65f6\uff0c\u5efa\u8bae\u4f7f\u7528\u5b9e\u73b0\u65b9\u5f0f
\n\u7ee7\u627fThread\uff1a\u7ebf\u7a0b\u4ee3\u7801\u5b58\u653e\u5728Thread\u5b50\u7c7b\u7684run\u65b9\u6cd5\u4e2d
\n\u5b9e\u73b0Runnable\uff1a\u7ebf\u7a0b\u4ee3\u7801\u5b58\u5728\u63a5\u53e3\u7684\u5b50\u7c7b\u7684run\u65b9\u6cd5\u4e2d
\n\u901a\u8fc7\u5206\u6790\uff0c\u53d1\u73b0\uff0c\u6253\u5370 0\uff0c-1\uff0c-2\u7b49\u9519\u7968\uff08\u6a21\u62df\u4e70\u7968\u7cfb\u7edf\uff09
\n\u591a\u7ebf\u7a0b\u7684\u8fd0\u884c\u51fa\u73b0\u4e86\u5b89\u5168\u95ee\u9898
\n\u95ee\u9898\u7684\u539f\u56e0\uff1a
\n\u5f53\u591a\u6761\u8bed\u53e5\u5728\u64cd\u4f5c\u540c\u4e00\u4e2a\u7ebf\u7a0b\u5171\u4eab\u6570\u636e\u65f6\uff0c\u4e00\u4e2a\u7ebf\u7a0b\u5bf9\u591a\u6761\u8bed\u53e5\u53ea\u6267\u884c\u4e86\u4e00\u90e8\u5206\uff0c\u8fd8\u6ca1\u6709\u6267\u884c\u5b8c\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u53c2\u4e0e\u8fdb\u6765\u6267\u884c\uff0c\u5bfc\u81f4\u5171\u4eab\u6570\u636e\u7684\u9519\u8bef
\n\u89e3\u51b3\u529e\u6cd5\uff1a
\n\u5bf9\u591a\u6761\u64cd\u4f5c\u5171\u4eab\u6570\u636e\u7684\u8bed\u53e5\uff0c\u53ea\u80fd\u8ba9\u4e00\u4e2a\u7ebf\u7a0b\u90fd\u6267\u884c\u5b8c\uff0c\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u5176\u4ed6\u7ebf\u7a0b\u4e0d\u53ef\u4ee5\u53c2\u4e0e\u6267\u884c\u3002
\njava\u5bf9\u4e8e\u591a\u7ebf\u7a0b\u7684\u5b89\u5168\u95ee\u9898\u63d0\u4f9b\u4e86\u4e13\u4e1a\u7684\u89e3\u51b3\u65b9\u5f0f\uff1a\u540c\u6b65\u4ee3\u7801\u5757
\n\u540c\u6b65\u4ee3\u7801\u5757\uff1a<\/p>\n
synchronized\uff08\u5bf9\u8c61\uff09{\n    \u9700\u8981\u88ab\u540c\u6b65\u7684\u8bed\u53e5\n}<\/pre>\n
 
\n\u5bf9\u8c61\u5982\u540c\u9501\uff0c\u6301\u6709\u9501\u7684\u7ebf\u7a0b\u53ef\u4ee5\u5728\u540c\u6b65\u4e2d\u6267\u884c\uff0c\u6ca1\u6709\u6301\u6709\u9501\u7684\u7ebf\u7a0b\u5373\u4f7f\u83b7\u53d6cpu\u7684\u6267\u884c\u6743\uff0c\u4e5f\u8fdb\u4e0d\u53bb\uff0c\u56e0\u4e3a\u6ca1\u6709\u83b7\u53d6\u9501
\n\u540c\u6b65\u7684\u524d\u63d0\uff1a
\n1.\u5fc5\u987b\u8981\u6709\u4e24\u4e2a\u6216\u4e24\u4e2a\u4ee5\u4e0a\u7684\u7ebf\u7a0b\u3002
\n2.\u5fc5\u987b\u662f\u591a\u4e2a\u7ebf\u7a0b\u4f7f\u7528\u7528\u4e00\u4e2a\u9501
\n\u5fc5\u987b\u4fdd\u8bc1\u540c\u6b65\u4e2d\u53ea\u80fd\u53c8\u4e00\u4e2a\u7ebf\u7a0b\u5728\u8fd0\u884c
\n\u597d\u5904\uff1a\u89e3\u51b3\u4e86\u591a\u7ebf\u7a0b\u7684\u5b89\u5168\u95ee\u9898\u3002
\n\u5f0a\u7aef\uff1a\u591a\u4e2a\u7ebf\u7a0b\u9700\u8981\u5224\u65ad\u9501\uff0c\u8f83\u4e3a\u6d88\u8017\u8d44\u6e90\u3002
\n\u540c\u6b65\u51fd\u6570\u7528\u7684\u662f\u54ea\u4e00\u4e2a\u9501\u5462\uff1f
\n\u51fd\u6570\u9700\u8981\u88ab\u5bf9\u8c61\u8c03\u7528\uff0c\u90a3\u4e48\u51fd\u6570\u90fd\u53c8\u4e00\u4e2a\u6240\u5c5e\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u5c31\u662fthis\u6240\u4ee5\u540c\u6b65\u51fd\u6570\u4f7f\u7528\u7684\u9501\u662fthis
\n\u5982\u679c\u540c\u6b65\u51fd\u6570\u88ab\u9759\u6001\u4fee\u9970\u540e\uff0c\u4f7f\u7528\u7684\u9501\u662f\u4ec0\u4e48\uff1f
\n\u901a\u8fc7\u9a8c\u8bc1\uff0c\u53d1\u73b0\u4e0d\u662fthis\uff0c\u56e0\u4e3a\u9759\u6001\u65b9\u6cd5\u4e2d\u4e5f\u4e0d\u53ef\u4ee5\u5b9a\u4e49this\u9759\u6001\u8fdb\u5185\u5b58\u65f6\uff0c\u5185\u5b58\u4e2d\u6ca1\u6709\u672c\u7c7b\u5bf9\u8c61\uff0c\u4f46\u662f\u4e00\u5b9a\u6709\u8be5\u7c7b\u5bf9\u5e94\u7684\u5b57\u8282\u7801\u6587\u4ef6\u5bf9\u8c61\uff08\u7c7b\u540d.class\uff09\u8be5\u5bf9\u8c61\u7684\u7c7b\u578b\u662fClass
\n\u9759\u6001\u7684\u540c\u6b65\u65b9\u6cd5\uff1a\u4f7f\u7528\u7684\u9501\u662f\u8be5\u65b9\u6cd5\u6240\u5728\u7c7b\u7684\u5b57\u8282\u7801\u6587\u4ef6\u5bf9\u8c61\u3002 \u7c7b\u540d.class
\n\u5355\u4f8b\u8bbe\u8ba1\u6a21\u5f0f<\/strong>
\n\u997f\u6c49\u5f0f\uff1a
\n <\/p>\n
class Single{\n  private static final Single s = new Single();\n  private Single(){\n    \u4ee3\u7801\uff1b\n  }\n  public static Single getInstance(){\n    return s;\n  }\n}<\/pre>\n
 
\n\u61d2\u6c49\u5f0f\uff1a
\n <\/p>\n
class Single{\n  private static Single s = null;\n  private Single(){\n    \u4ee3\u7801\uff1b\n  }\n  public static synchronized Single getInstance(){\/\/\u5728\u8fd9\u52a0\u540c\u6b65\u6bd4\u8f83\u4f4e\u6548\n    if(s==null){\n    s = new Single();\n  }\n  return s;\n}<\/pre>\n
<\/h1>\n
 <\/p>\n
\u7ebf\u7a0b\u95f4\u901a\u8baf<\/strong><\/h1>\n
\u5176\u5b9e\u5c31\u662f\u591a\u4e2a\u7ebf\u7a0b\u5728\u64cd\u4f5c\u540c\u4e00\u4e2a\u8d44\u6e90\uff0c\u4f46\u662f\u64cd\u4f5c\u7684\u52a8\u4f5c\u4e0d\u540c
\nwait() notify()\u00a0 notifyAll()
\n\u90fd\u4f7f\u7528\u5728\u540c\u6b65\u4e2d\uff0c\u56e0\u4e3a\u8981\u5bf9\u6301\u6709\u76d1\u89c6\u5668\uff08\u9501\uff09\u7684\u7ebf\u7a0b\u64cd\u4f5c\uff0c\u6240\u4ee5\u8981\u4f7f\u7528\u5728\u540c\u6b65\u4e2d\uff0c\u56e0\u4e3a\u53ea\u6709\u540c\u6b65\u624d\u5177\u6709\u9501\u7684\u6982\u5ff5
\n\u4e3a\u4ec0\u4e48\u8fd9\u4e9b\u64cd\u4f5c\u7ebf\u7a0b\u7684\u65b9\u6cd5\u8981\u5b9a\u4e49\u5728Object\u7c7b\u4e2d\u5462\uff1f
\n\u56e0\u4e3a\u8fd9\u4e9b\u65b9\u6cd5\u5728\u64cd\u4f5c\u540c\u6b65\u4e2d\u7ebf\u7a0b\u65f6\uff0c\u90fd\u5fc5\u987b\u8981\u6807\u8bc6\u4ed6\u4eec\u6240\u64cd\u4f5c\u7ebf\u7a0b\u53ea\u6709\u7684\u9501\uff0c\u53ea\u6709\u540c\u4e00\u4e2a\u9501\u4e0a\u7684\u88ab\u7b49\u5f85\u7ebf\u7a0b\u53ef\u4ee5\u88ab\u540c\u4e00\u4e2a\u9501\u4e0a\u7684notify\uff08\uff09\u5524\u9192\uff0c\u4e0d\u53ef\u4ee5\u5bf9\u4e0d\u540c\u9501\u4e2d\u7684\u7ebf\u7a0b\u8fdb\u884c\u5524\u9192\uff0c\u4e5f\u5c31\u662f\u8bf4 \u7b49\u5f85\u548c\u5524\u9192\u5fc5\u987b\u662f\u540c\u4e00\u4e2a\u9501\uff0c\u800c\u9501\u53ef\u4ee5\u662f\u4efb\u610f\u5bf9\u8c61\uff0c\u6240\u4ee5\u53ef\u4ee5\u88ab\u4efb\u610f\u5bf9\u8c61\u8c03\u7528\u7684\u65b9\u6cd5\u5b9a\u4e49\u5728Object\u7c7b\u4e2d\u3002
\n\u5bf9\u4e8e\u591a\u4e2a\u751f\u4ea7\u8005\u548c\u6d88\u8d39\u8005
\n\u4e3a\u4ec0\u4e48\u8981\u5b9a\u4e49while\u5224\u65ad\u6807\u8bb0\uff1f
\n\u8ba9\u88ab\u5524\u9192\u7684\u7ebf\u7a0b\u518d\u4e00\u6b21\u5224\u65ad\u6807\u8bb0
\n\u4e3a\u4ec0\u4e48\u5b9a\u4e49notifyAll\uff08\uff09
\n\u56e0\u4e3a\u9700\u8981\u5524\u9192\u5bf9\u65b9\u7ebf\u7a0b\uff0c\u53ea\u7528notify\uff08\uff09\uff0c\u5bb9\u6613\u51fa\u73b0\u503c\u5524\u9192\u672c\u65b9\u7ebf\u7a0b\u7684\u60c5\u51b5\uff0c\u5bfc\u81f4\u7a0b\u5e8f\u4e2d\u7684\u6240\u6709\u7ebf\u7a0b\u90fd\u7b49\u5f85
\nJDK1.5 \u4e2d\u63d0\u4f9b\u4e86\u591a\u7ebf\u7a0b\u5347\u7ea7\u89e3\u51b3\u65b9\u6848
\n\u5c06\u540c\u6b65synchronized\u66ff\u6362\u6210\u73b0\u5b9eLock\u64cd\u4f5c
\n\u5c06Object\u4e2d\u7684wait notify notifyAll \u66ff\u6362\u4e86Condition\u5bf9\u8c61
\n\u8be5\u5bf9\u8c61\u53ef\u4ee5lock\u9501\uff0c\u8fdb\u884c\u83b7\u53d6
\n\u5728\u793a\u4f8b\uff08\u751f\u4ea7\u8005\u6d88\u8d39\u8005\uff09\u5b9e\u73b0\u4e86\u672c\u65b9\u53ea\u5524\u9192\u5bf9\u65b9\u7684\u64cd\u4f5c
\nstop\u65b9\u6cd5\u5df2\u7ecf\u8fc7\u65f6 \u90a3\u4e48\u5982\u4f55\u505c\u6b62\u7ebf\u7a0b\uff1f
\n\u53ea\u6709\u4e00\u4e2d run\u65b9\u6cd5\u7ed3\u675f\uff0c\u5f00\u542f\u591a\u7ebf\u7a0b\u8fd0\u884c\uff0c\u8fd0\u884c\u4ee3\u7801\u901a\u5e38\u662f\u5faa\u73af\u7ed3\u6784
\n\u53ea\u8981\u63a7\u5236\u4f4f\u5faa\u73af\uff0c\u5c31\u53ef\u4ee5\u8ba9run\u65b9\u6cd5\u7ed3\u675f\uff0c\u4e5f\u5c31\u662f\u7ebf\u7a0b\u7ed3\u675f
\n\u7279\u6b8a\u60c5\u51b5\uff1a
\n\u5f53\u7ebf\u7a0b\u5904\u4e8e\u51bb\u7ed3\u72b6\u6001
\n\u5c31\u4e0d\u4f1a\u8bfb\u53d6\u5230\u6807\u8bb0\uff0c\u90a3\u4e48\u7a0b\u5e8f\u5c31\u4e0d\u4f1a\u7ed3\u675f
\n\u5f53\u6ca1\u6709\u6307\u5b9a\u7684\u65b9\u5f0f\u8ba9\u51bb\u7ed3\u7684\u7ebf\u7a0b\u56de\u590d\u5230\u8fd0\u884c\u72b6\u6001\u65f6\uff0c\u8fd9\u662f\u9700\u8981\u5bf9\u51bb\u7ed3\u8fdb\u884c\u6e05\u9664\u3002
\nThread\u7c7b\u4e2d\u63d0\u4f9b\u4e86\u65b9\u6cd5 interrupt\uff08\uff09
\njoin\uff1a
\n\u5f53A\u7ebf\u7a0b\u6267\u884c\u5230\u4e86B\u7ebf\u7a0b\u7684join\u65b9\u6cd5\u65f6\uff0cA\u5c31\u4f1a\u7b49\u5f85\uff0c\u7b49B\u7ebf\u7a0b\u6267\u884c\u5b8c\uff0cA\u624d\u4f1a\u6267\u884cjoin\u53ef\u4ee5\u7528\u6765\u4e34\u65f6\u52a0\u5165\u7ebf\u7a0b\u6267\u884c
\n 
\n <\/p>\n
String\u7c7b<\/strong><\/h1>\n
String\u7c7b\u7528\u4e8e\u63cf\u8ff0\u5b57\u7b26\u4e32\u4e8b\u7269
\n\u90a3\u4e48\u4ed6\u5c31\u63d0\u4f9b\u4e86\u591a\u4e2a\u65b9\u6cd5\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u64cd\u4f5c
\n\u5e38\u89c1\u7684\u64cd\u4f5c\u6709\u90a3\u4e9b\uff1f
\n\u201cabcd\u201d
\n1.\u83b7\u53d6
\n1.1 \u5b57\u7b26\u4e32\u4e2d\u5305\u542b\u7684\u5b57\u7b26\u6570\uff0c\u4e5f\u5c31\u662f\u5b57\u7b26\u4e32\u7684\u957f\u5ea6
\nint length()\uff1b\u83b7\u53d6\u957f\u5ea6
\n1.2 \u6839\u636e\u4f4d\u7f6e\u83b7\u53d6\u4f4d\u7f6e\u4e0a\u7684\u67d0\u4e2a\u5b57\u7b26
\nchar charAt(int index)\uff1b
\n1.3 \u6839\u636e\u5b57\u7b26\u83b7\u53d6\u8be5\u5b57\u7b26\u5728\u5b57\u7b26\u4e32\u4e2d\u7684\u4f4d\u7f6e
\nint indexOf(int ch)\uff1b\u8fd4\u56de\u7684\u662fch\u5728\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e
\nint indexOf(int ch,int fronIndex\uff09\uff1b\u4ecefromIndex\u4f4d\u7f6e\u5f00\u59cb\uff0c\u83b7\u53d6ch\u5728\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e
\nint indexOf(String str)\uff1b\u8fd4\u56de\u7684\u662fstr\u5728\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e
\nint indexOf(String str,int fronIndex\uff09\uff1b\u4ecefromIndex\u4f4d\u7f6e\u5f00\u59cb\uff0c\u83b7\u53d6str\u5728\u4e32\u4e2d\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d
\n2.\u5224\u65ad
\n2.1 \u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u5305\u542b\u4e00\u4e2a\u5b50\u4e32
\nboolean contains(str)\uff1b\u7279\u6b8a\u4e4b\u5904\uff1aindexof(str)\uff1a\u53ef\u4ee5\u7d22\u5f15str\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002\u5982\u679c\u8fd4\u56de-1
\n\u8bf4\u660estr\u4e0d\u5728\u5b57\u7b26\u4e32\u4e2d\u6240\u4ee5\uff0c\u4e5f\u53ef\u4ee5\u7528\u4e8e\u5bf9\u6307\u5b9a\u5224\u65ad\u662f\u5426\u5305\u542b
\nif(str.indexOf(“aa”)!=-1)\u800c\u4e14\u8be5\u65b9\u6cd5\u65e2\u53ef\u4ee5\u5224\u65ad\uff0c\u8fd8\u53ef\u4ee5\u83b7\u53d6\u51fa\u73b0\u7684\u4f4d\u7f6e
\n2.2 \u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u6709\u5185\u5bb9
\nboolean isEmpty()\uff1b\u539f\u7406\u5c31\u662f\u5224\u65ad\u662f\u5426\u4e3a0
\n2.3 \u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u662f\u4ee5\u6307\u5b9a\u5185\u5bb9\u5f00\u5934
\nboolean startWith(srt)\uff1b
\n2.4 \u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u662f\u4ee5\u6307\u5b9a\u5185\u5bb9\u7ed3\u5c3e
\nboolean endWith(srt)\uff1b
\n2.5 \u5224\u65ad\u5b57\u7b26\u4e32\u5185\u5bb9\u662f\u5426\u76f8\u540c\uff0c\u590d\u5199\u4e86Object\u7c7b\u4e2d\u7684equals\u65b9\u6cd5
\nboolean equals(str);
\n2.6 \u5224\u65ad\u5185\u7528\u662f\u5426\u76f8\u540c\uff0c\u5ffd\u7565\u5927\u5c0f\u5199
\nboolean equalsIgnoreCase(\uff09\uff1b.
\n3.\u8f6c\u6362
\n3.1 \u5c06\u5b57\u7b26\u6570\u7ec4\u8f6c\u6210\u5b57\u7b26\u4e32
\n\u6784\u9020\u51fd\u6570\uff1aString(char[])
\nString(char[],offset,count)\u5c06\u5b57\u7b26\u6570\u7ec4\u4e2d\u7684\u4e00\u90e8\u5206\u8f6c\u6210\u5b57\u7b26\u4e32
\n\u9759\u6001\u65b9\u6cd5\uff1astatic String copyValueOf(char[])
\nstatic String copyValueOf(char[],data,int offset,count)
\nstatic String valueOf(char[])
\n3.2 \u5c06\u5b57\u7b26\u4e32\u8f6c\u6210\u5b57\u7b26\u6570
\nchar[] toCharArrey()\uff1b
\n3.3 \u5c06\u5b57\u8282\u6570\u7ec4\u8f6c\u6210\u5b57\u7b26\u4e32
\nString(byte[])
\nString(byte[],offset,count)\u5c06\u5b57\u7b26\u6570\u7ec4\u4e2d\u7684\u4e00\u90e8\u5206\u8f6c\u6210\u5b57\u7b26\u4e32
\n3.4 \u5c06\u5b57\u7b26\u4e32\u8f6c\u6210\u5b57\u8282\u6570\u7ec4
\nbyte[] getByts();
\n3.5 \u5c06\u57fa\u672c\u6570\u636e\u7c7b\u578b\u8f6c\u6210\u5b57\u7b26\u4e32
\nstatic String valueOf(int)
\nstatic String valueOf(double)
\n3+”” =\u00a0 String.valusOf(3)
\n\u7279\u6b8a\uff1a\u5b57\u7b26\u4e32\u548c\u5b57\u8282\u6570\u7ec4\u5728\u8f6c\u6362\u8fc7\u7a0b\u4e2d\uff0c\u662f\u53ef\u4ee5\u6307\u5b9a\u7f16\u7801\u8868\u7684\u3002
\n4.\u66ff\u6362
\nString replace\uff08oldchar,newchar\uff09\uff1b\/\/\u5982\u679c\u8981\u66ff\u6362\u7684\u5b57\u7b26\u4e0d\u5b58\u5728\uff0c\u8fd4\u56de\u7684\u8fd8\u662f\u539f\u4e32
\n5.\u5207\u5272
\nString[] split(regex\uff09\uff1b
\n6.\u5b50\u4e32
\n\u83b7\u53d6\u5b57\u7b26\u4e32\u4e2d\u7684\u4e00\u90e8\u5206
\nString substring(begin)\uff1b\/\/\u4ece\u6307\u5b9a\u4f4d\u7f6e\u5230\u7ed3\u5c3e
\nString substring(begin,end)\uff1b\/\/\u4ece\u6307\u5b9a\u4f4d\u7f6e\u5230\u6307\u5b9a\u4f4d\u7f6e-1
\n7.\u8f6c\u6362 \u53bb\u9664\u7a7a\u683c \u6bd4\u8f83
\n7.1 \u5c06\u5b57\u7b26\u4e32\u8f6c\u6210\u5927\u5199\u6216\u5c0f\u5199
\nString toUpperCase()
\nString toLowerCase()
\n7.2 \u5c06\u5b57\u7b26\u4e32\u4e24\u7aef\u7684\u591a\u4e2a\u7a7a\u683c\u53bb\u9664
\nString trim()
\n7.3 \u5bf9\u4e24\u4e2a\u5b57\u7b26\u4e32\u8fdb\u884c\u81ea\u7136\u987a\u5e8f\u7684\u6bd4\u8f83
\nint compareTo(string)
\n 
\n <\/p>\n
StringBuffer<\/strong><\/h1>\n
\u662f\u4e00\u4e2a\u5bb9\u5668
\n\u7279\u70b9\uff1a\u800c\u4e14\u957f\u5ea6\u662f\u53ef\u53d8\u5316\u7684\u53ef\u4ee5\u76f4\u63a5\u64cd\u4f5c\u591a\u4e2a\u6570\u636e\u7c7b\u578b\u6700\u7ec8\u4f1a\u7528\u8fc7toString\u65b9\u6cd5\u53d8\u6210\u5b57\u7b26\u4e32
\nC create\u00a0 U update R\u00a0 read D delete
\n1.\u5b58\u50a8
\nStringBuffer append\uff08\uff09\uff1b\u5c06\u6307\u5b9a\u6570\u636e\u4f5c\u4e3a\u53c2\u6570\u6dfb\u52a0\u5230\u5df2\u6709\u6570\u636e\u7684\u7ed3\u5c3e\u5904
\nStringBuffer insert(index,\u6570\u636e\uff09\uff1b\u53ef\u4ee5\u5c06\u6570\u636e\u63d2\u5165\u5230\u6307\u5b9aindex\u4f4d\u7f6e
\n2.\u5220\u9664
\nStringBuffer delete(start\uff0cend)\uff1b\u5220\u9664\u7f13\u51b2\u533a\u4e2d\u7684\u6570\u636e\uff0c\u5305\u542bstart\u4e0d\u5305\u542bend
\nStringBuffer deleteCharAt(index\uff09\uff1b\u5220\u9664\u6307\u5b9a\u4f4d\u7f6e\u7684\u5b57\u7b26
\n3.\u83b7\u53d6
\nchar charAt(int index);
\nchar indexOf(String str);
\nint lastIndexOf(String str)
\nint length()
\nString substring(int start,int end)
\n4.\u4fee\u6539
\nStringBuffer replace(start,end,string)
\nvoid setCharAt(int index,char ch)
\n5.\u53cd\u8f6c
\nStringBuffer reverse();
\n6.\u5c06\u7f13\u51b2\u533a\u4e2d\u7684\u6307\u5b9a\u6570\u636e\u5b58\u50a8\u5230\u6307\u5b9a\u6570\u7ec4\u4e2d
\nvoid getChars(int srcBegin,int srcEnd,char[] dst,int dstBegin)\uff08src\u6e90 dst \u76ee\u7684\uff09
\n\u5728JDK1.5\u7248\u672c\u4e4b\u540e\u51fa\u73b0\u4e86StringBuilder
\nStringBuffer\u662f\u7ebf\u7a0b\u540c\u6b65
\nStringBuilder\u662f\u7ebf\u7a0b\u4e0d\u540c\u6b65
\nJDK\u5347\u7ea7\u7684\u4e09\u4e2a\u56e0\u7d20\uff1a
\n1.\u63d0\u9ad8\u6548\u7387
\n2.\u7b80\u5316\u4e66\u5199
\n3.\u63d0\u9ad8\u5b89\u5168\u6027
\n\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5bf9\u8c61\u5305\u88c5\u7c7b<\/p>\n
\u7c7b\u578b     \u5bf9\u8c61\nbyte\u3000\u3000 Byte\nshort\u3000\u3000Short\nint\u3000\u3000  Integer\nlong\u3000\u3000 Long\nboolean\u3000Boolean\nfloat\u3000\u3000Float\ndouble\u3000 Double\nchar  \u3000 Character<\/pre>\n
\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5305\u88c5\u7c7b\u7684\u6700\u5e38\u7528\u4f5c\u7528
\n\u5c31\u662f\u7528\u4e8e\u57fa\u672c\u6570\u636e\u7c7b\u578b\u548c\u5b57\u7b26\u4e32\u7c7b\u578b\u4e4b\u95f4\u7684\u8f6c\u6362
\n\u57fa\u672c\u6570\u636e\u7c7b\u578b\u8f6c\u6210\u5b57\u7b26\u4e32
\n\u57fa\u672c\u6570\u636e\u7c7b\u578b+\u201c\u201d
\n\u57fa\u672c\u6570\u636e\u7c7b\u578b.toString\uff08\u57fa\u672c\u6570\u636e\u7c7b\u578b\u503c\uff09\uff1b
\n\u5b57\u7b26\u4e32\u8f6c\u6210\u57fa\u672c\u6570\u636e\u7c7b\u578b
\n\u9759\u6001\u65b9\u6cd5
\nparseInt\uff08String str\uff09
\nxxx a = Xxx.parseXxx(String);
\n\u975e\u9759\u6001\u65b9\u6cd5
\nInteger i =new Integer(“123”)l;
\nint num = i.intValue();
\n\u5341\u8fdb\u5236\u8f6c\u6210\u5176\u4ed6\u8fdb\u5236
\ntoBinaryString() \u00a0\u00a0 \u00a0 2
\ntoHexString() \u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a016
\ntoOctalString()\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a08
\n\u5176\u4ed6\u8fdb\u5236\u8f6c\u6210\u5341\u8fdb\u5236
\nparseInt(string,radix)<\/p>\n
\u96c6\u5408\u6846\u67b6<\/strong><\/h1>\n
\u4e3a\u4ec0\u4e48\u4f1a\u51fa\u73b0\u8fd9\u4e48\u591a\u7684\u5bb9\u5668\u5462\uff1f
\n\u56e0\u4e3a\u6bcf\u4e00\u4e2a\u5bb9\u5668\u5bf9\u6570\u636e\u7684\u5b58\u50a8\u65b9\u5f0f\u90fd\u6709\u4e0d\u540c\uff0c\u8fd9\u4e2a\u5b58\u50a8\u65b9\u5f0f\u6211\u4eec\u79f0\u4e4b\u4e3a\uff1a\u6570\u636e\u7ed3\u6784
\nadd\u65b9\u6cd5\u7684\u53c2\u6570\u7c7b\u578b\u662fObject\u3002\u4ee5\u4fbf\u4e8e\u63a5\u6536\u4efb\u610f\u7c7b\u578b\u7684\u5bf9\u8c61
\n\u96c6\u5408\u4e2d\u5b58\u50a8\u7684\u90fd\u662f\u5bf9\u8c61\u7684\u5f15\u7528\uff08\u5730\u5740\uff09
\n\u4ec0\u4e48\u662f\u8fed\u4ee3\u5668\u5462
\n\u5176\u5b9e\u5c31\u662f\u96c6\u5408\u7684\u53d6\u51fa\u5143\u7d20\u7684\u65b9\u5f0f
\n\u5c31\u628a\u53d6\u51fa\u65b9\u5f0f\u5b9a\u4e49\u5728\u96c6\u5408\u7684\u5185\u90e8\u8fd9\u6837\u53d6\u51fa\u65b9\u5f0f
\n\u5c31\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u96c6\u5408\u5185\u5bb9\u7684\u5143\u7d20
\n\u90a3\u4e48\u53d6\u51fa\u65b9\u5f0f\u5c31\u88ab\u5b9a\u4e49\u6210\u4e86\u5185\u90e8\u7c7b
\n\u800c\u6bcf\u4e00\u4e2a\u5bb9\u5668\u7684\u6570\u636e\u7ed3\u6784\u4e0d\u540c
\n\u6240\u4ee5\u53d6\u51fa\u7684\u52a8\u4f5c\u7ec6\u8282\u4e5f\u4e0d\u4e00\u6837\uff0c\u4f46\u662f\u90fd\u6709\u5171\u6027\u5185\u5bb9\uff0c\u5224\u65ad\u548c\u53d6\u51fa\uff0c\u90a3\u4e48\u53ef\u4ee5\u5c06\u5199\u5171\u6027\u62bd\u53d6
\n\u90a3\u4e48\u8fd9\u4e9b\u5185\u90e8\u7c7b\u90fd\u7b26\u5408\u4e00\u4e2a\u89c4\u5219\uff0c\u5c31\u662fIterator
\n\u5982\u4f55\u83b7\u53d6\u96c6\u5408\u7684\u53d6\u51fa\u5bf9\u8c61\u5462\uff1f
\n\u901a\u8fc7\u4e00\u4e2a\u5bf9\u5916\u63d0\u4f9b\u7684\u65b9\u6cd5 iterator\uff08\uff09\uff1b
\nCollection<\/p>\n
    |--List \u5143\u7d20\u6709\u5e8f\u800c\u4e14\u53ef\u4ee5\u91cd\u590d \u56e0\u4e3a\u8be5\u96c6\u5408\u4f53\u7cfb\u6709\u7d22\u5f15\n        |---ArreyList    \u5e95\u5c42\u7684\u6570\u636e\u7ed3\u6784\u4f7f\u7528\u7684\u662f\u6570\u7ec4\u7ed3\u6784 \u7ebf\u7a0b\u4e0d\u540c\u6b65\n        |---LinkedList    \u5e95\u5c42\u4f7f\u7528\u7684\u662f\u94fe\u8868\u6570\u636e\u7ed3\u6784\n        |---Vector    \u5e95\u5c42\u662f\u6570\u7ec4\u6570\u636e\u7ed3\u6784  \u7ebf\u7a0b\u540c\u6b65  \u88abArreyList\u66ff\u4ee3\n    |--Set  \u5143\u7d20\u662f\u65e0\u5e8f\u7684\u4e0d\u53ef\u4ee5\u91cd\u590d \u56e0\u4e3a\u6ca1\u6709\u7d22\u5f15<\/pre>\n
 <\/p>\n
List\uff1a<\/h4>\n
\u7279\u6709\u65b9\u6cd5\uff1a\u51e1\u662f\u53ef\u4ee5\u64cd\u4f5c\u89d2\u6807\u7684\u65b9\u6cd5\u90fd\u662f\u8be5\u4f53\u7cfb\u7279\u6709\u7684\u65b9\u6cd5
\n\u589e\uff1a
\nadd\uff08index\uff0celement\uff09
\naddAll\uff08index\uff0cCollection\uff09
\n\u5220\uff1a
\nremove\uff08index\uff09
\n\u6539\uff1a
\nset\uff08index\uff0celement\uff09
\n\u67e5\uff1a
\nget\uff08index\uff09
\nsubList\uff08from\uff0cto\uff09
\nlistIterator\uff08\uff09
\nList\u96c6\u5408\u7279\u6709\u7684\u8fed\u4ee3\u5668\uff1aListIterator\u662fIterator\u7684\u5b50\u63a5\u53e3
\n\u5728\u8fed\u4ee3\u65f6\uff0c\u4e0d\u53ef\u4ee5\u901a\u8fc7\u96c6\u5408\u5bf9\u8c61\u7684\u65b9\u6cd5\u64cd\u4f5c\u96c6\u5408\u4e2d\u7684\u5143\u7d20\uff0c\u56e0\u4e3a\u4f1a\u53d1\u751f\u5e76\u53d1\u4fee\u6539\u5f02\u5e38ConcurrentModificationException\u6240\u4ee5\u5728\u8fed\u4ee3\u65f6\uff0c\u53ea\u80fd\u7528\u8fed\u4ee3\u5668\u7684\u65b9\u6cd5\u64cd\u4f5c\u5143\u7d20\uff0c\u53ef\u662fIterator\u65b9\u6cd5\u662f\u6709\u9650\u7684\u53ea\u80fd\u5bf9\u5143\u7d20\u8fdb\u884c\u5224\u65ad\u53d6\u51fa\u5220\u9664\u7684\u64cd\u4f5c\uff0c\u5982\u9700\u8981\u5176\u4ed6\u7684\u64cd\u4f5c\u5982\u6dfb\u52a0\u4fee\u6539\u7b49\uff0c\u5c31\u9700\u8981\u4f7f\u7528\u5176\u5b50\u63a5\u53e3ListIterator\u63a5\u53e3\uff0c\u8be5\u63a5\u53e3\u53ea\u80fd\u901a\u8fc7List\u96c6\u5408\u7684ListIterator\u6765\u83b7\u53d6
\n\u679a\u4e3e\u5c31\u662fVector\u7279\u6709\u7684\u53d6\u51fa\u65b9\u5f0f\uff08\u8fed\u4ee3\u5668 \u5faa\u73afget\uff09
\n\u53d1\u73b0\u679a\u4e3e\u548c\u8fed\u4ee3\u5668\u5f88\u50cf
\n\u5176\u5b9e\u679a\u4e3e\u548c\u8fed\u4ee3\u662f\u4e00\u6837\u7684\uff0c\u56e0\u4e3a\u679a\u4e3e\u7684\u540d\u79f0\u4ee5\u53ca\u65b9\u6cd5\u7684\u540d\u79f0\u90fd\u8fc7\u957f\uff0c\u6240\u4ee5\u88ab\u8fed\u4ee3\u5668\u53d6\u4ee3
\nLinkedList\u7279\u6709\u65b9\u6cd5\uff1a
\naddFirst()
\naddLast()
\n\u83b7\u53d6\u5143\u7d20\u4f46\u4e0d\u5220\u9664\u5143\u7d20
\ngetFirst()
\ngetLast()
\n\u83b7\u53d6\u5143\u7d20\u4f46\u662f\u5143\u7d20\u88ab\u5220\u9664
\nremoveFirst()
\nremoveLast()
\n\u5982\u679c\u96c6\u5408\u4e2d\u6ca1\u6709\u5143\u7d20\uff0c\u4f1a\u51fa\u73b0NoSuchElementException\u5f02\u5e38
\n\u5728JDK1.6\u4e2d\u51fa\u73b0\u4e86\u66ff\u4ee3\u65b9\u6cd5
\nofferFirst\uff08\uff09
\nofferLast\uff08\uff09
\npeekFirst\uff08\uff09
\npeekLast\uff08\uff09
\npollFirst\uff08\uff09
\npollLast\uff08\uff09
\n\u5982\u679c\u96c6\u5408\u4e2d\u6ca1\u6709\u5143\u7d20\uff0c\u4f1a\u8fd4\u56denull
\nList\u96c6\u5408\u5224\u65ad\u5143\u7d20\u662f\u5426\u76f8\u540c\uff0c\u4f9d\u636e\u7684\u662f\u5143\u7d20\u7684equals\u65b9\u6cd5<\/p>\n
Set:<\/h4>\n
\u65e0\u5e8f\uff1a\u5b58\u5165\u548c\u53d6\u51fa\u7684\u987a\u5e8f\u4e0d\u4e00\u5b9a\u4e00\u81f4
\nSet\u529f\u80fd\u548cCollection\u662f\u4e00\u81f4\u7684<\/p>\n
    |--Set\n        |---HashSet    \u4f4e\u5c42\u6570\u636e\u7ed3\u6784\u662f\u54c8\u5e0c\u8868<\/pre>\n
HashCode\u662f\u5982\u4f55\u4fdd\u8bc1\u5143\u7d20\u7684\u552f\u4e00\u6027\u7684\u5462\uff1f
\n\u662f\u901a\u8fc7\u5143\u7d20\u7684\u4e24\u4e2a\u65b9\u6cd5 hashCode\u548cequals\u6765\u5b8c\u6210\u7684\uff0c\u5982\u679c\u5143\u7d20\u7684hashCode\u503c\u76f8\u540c\u624d\u4f1a\u5224\u65adequals\u662f\u5426\u4e3atrue\uff0c\u5982\u679c\u5143\u7d20\u7684hashCode\u503c\u4e0d\u540c\uff0c\u90a3\u4e48\u4e0d\u4f1a\u8c03\u7528equals
\n\u6ce8\u610f\uff1a\u5bf9\u4e8e\u5224\u65ad\u5143\u7d20\u662f\u5426\u5b58\u5728\u4ee5\u53ca\u5220\u9664\u7b49\u64cd\u4f5c\uff0c\u4f9d\u8d56\u7684\u65b9\u6cd5\u662f\uff0c\u5143\u7d20\u7684hashCode\u548cequals\u65b9\u6cd5
\n|—TreeSet\u00a0\u00a0 \u00a0\u53ef\u4ee5\u5bf9Set\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u8fdb\u884c\u6392\u5e8f
\n\u6392\u5e8f\u65f6\uff1a\u5f53\u4e3b\u8981\u6761\u4ef6\u76f8\u540c\u65f6\uff0c\u4e00\u5b9a\u8981\u5224\u65ad\u4e00\u4e0b\u6b21\u8981\u6761\u4ef6
\n\u4f4e\u5c42\u6570\u636e\u7ed3\u6784\u662f\u4e8c\u53c9\u6811
\n\u4fdd\u8bc1\u6570\u636e\u552f\u4e00\u6027\u7684\u4f9d\u636e\u662f compareTo\u65b9\u6cd5\u7684return 0\uff1b
\nTreeSet\u6392\u5e8f\u7684\u7b2c\u4e00\u79cd\u65b9\u5f0f\uff1a
\n\u8ba9\u5143\u7d20\u81ea\u8eab\u5177\u5907\u6bd4\u8f83\u6027\uff0c\u5143\u7d20\u9700\u8981\u5b9e\u73b0Comparable\u65b9\u6cd5\uff0c\u8986\u76d6compareTo\u65b9\u6cd5\uff0c\u8fd9\u79cd\u65b9\u6cd5\u4e5f\u6210\u4e3a\u5143\u7d20\u7684\u81ea\u7136\u987a\u5e8f\uff0c\u6216\u53eb\u505a\u9ed8\u8ba4\u6392\u5e8f
\nTreeSet\u6392\u5e8f\u7684\u7b2c\u4e8c\u79cd\u65b9\u5f0f\uff1a
\n\u5f53\u5143\u7d20\u81ea\u8eab\u4e0d\u5177\u5907\u6bd4\u8f83\u6027\u6216\u8005\u5177\u5907\u7684\u6bd4\u8f83\u6027\u4e0d\u662f\u6240\u9700\u8981\u7684\uff0c\u8fd9\u65f6\u5019\u9700\u8981\u8ba9\u96c6\u5408\u81ea\u8eab\u5177\u5907\u6bd4\u8f83\u6027
\n\u5728\u96c6\u5408\u521d\u59cb\u5316\u65f6\uff0c\u5c31\u6709\u4e86\u6bd4\u8f83\u65b9\u5f0f
\n\u5f53\u4e24\u79cd\u6392\u5e8f\u90fd\u5b58\u5728\u65f6\uff0c\u4ee5\u6bd4\u8f83\u5668\u4e3a\u4e3b
\n\u6bd4\u8f83\u5668\uff1a\u5b9a\u4e49\u4e00\u4e2a\u7c7b\u5b9e\u73b0Comparator\u63a5\u53e3\u8986\u76d6compare\u65b9\u6cd5<\/p>\n
\u6cdb\u578b<\/strong><\/h1>\n
\u6cdb\u578b\uff1aJDK1.5\u7248\u672c\u4ee5\u540e\u51fa\u73b0\u7684\u65b0\u7279\u6027\uff0c\u7528\u4e8e\u89e3\u51b3\u5b89\u5168\u95ee\u9898\uff0c\u662f\u4e00\u4e2a\u5b89\u5168\u673a\u5236
\n\u597d\u5904\uff1a
\n1.\u5c06\u8fd0\u884c\u65f6\u671f\u51fa\u73b0\u7684\u95ee\u9898ClassCastException\u8f6c\u79fb\u5230\u4e86\u7f16\u8bd1\u65f6\u671f\uff0c\u65b9\u4fbf\u4e86\u7a0b\u5e8f\u5458\u89e3\u51b3\u95ee\u9898\uff0c\u8ba9\u8fd0\u884c\u65f6\u671f\u95ee\u9898\u51cf\u5c11\uff0c\u5b89\u5168\u3002
\n2.\u907f\u514d\u4e86\u5f3a\u5236\u8f6c\u6362\u7684\u9ebb\u70e6\u3002
\n\u6cdb\u578b\u683c\u5f0f\uff1a\u901a\u8fc7<>\u5728\u5b9a\u4e49\u8981\u64cd\u4f5c\u7684\u5f15\u7528\u6570\u636e\u7c7b\u578b
\n\u5728\u4f7f\u7528java\u63d0\u4f9b\u7684\u5bf9\u8c61\u65f6\uff0c\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\u6cdb\u578b\u5462\uff1f
\n\u901a\u5e38\u5728\u96c6\u5408\u6846\u67b6\u4e2d\u5f88\u5e38\u89c1
\n\u53ea\u8981\u89c1\u5230<>\u5c31\u8981\u5b9a\u4e49\u6cdb\u578b
\n\u5176\u5b9e<>\u5c31\u662f\u7528\u6765\u63a5\u6536\u7c7b\u578b\u7684
\n\u5f53\u4f7f\u7528\u96c6\u5408\u65f6\uff0c\u5c06\u96c6\u5408\u4e2d\u8981\u5b58\u50a8\u7684\u6570\u636e\u7c7b\u578b\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u5230<>\u4e2d\u5373\u53ef
\n\u4ec0\u4e48\u65f6\u5019\u5b9a\u4e49\u6cdb\u578b\u7c7b\uff1f
\n\u5f53\u7c7b\u4e2d\u8981\u64cd\u4f5c\u7684\u5f15\u7528\u6570\u636e\u7c7b\u578b\u4e0d\u786e\u5b9a\u7684\u65f6\u5019\u3002\u65e9\u671f\u5b9a\u4e49Object\u6765\u5b8c\u6210\u6269\u5c55\uff0c\u73b0\u5728\u5b9a\u4e49\u6cdb\u578b\u6765\u5b8c\u6210\u6269\u5c55\u3002
\n\u6cdb\u578b\u7c7b\u5b9a\u4e49\u7684\u6cdb\u578b\uff0c\u5728\u6574\u4e2a\u7c7b\u4e2d\u6709\u6548\uff0c\u5982\u679c\u88ab\u65b9\u6cd5\u4f7f\u7528
\n\u90a3\u4e48\u6cdb\u578b\u7c7b\u7684\u5bf9\u8c61\u660e\u786e\u8981\u64cd\u4f5c\u7684\u5177\u4f53\u7c7b\u578b\u540e\uff0c\u6240\u6709\u8981\u64cd\u4f5c\u7684\u7c7b\u578b\u5c31\u5df2\u7ecf\u56fa\u5b9a\u4e86\uff0c\u4e3a\u4e86\u8ba9\u4e0d\u540c\u65b9\u6cd5\u53ef\u4ee5\u64cd\u4f5c\u4e0d\u540c\u7c7b\u578b\uff0c\u800c\u4e14\u7c7b\u578b\u8fd8\u4e0d\u786e\u5b9a\uff0c\u90a3\u4e48\u53ef\u4ee5\u5c06\u6cdb\u578b\u5b9a\u4e49\u5728\u65b9\u6cd5\u4e0a
\n\u9759\u6001\u65b9\u6cd5\u4e0d\u53ef\u4ee5\u8bbf\u95ee\u7c7b\u4e0a\u5b9a\u4e49\u7684\u6cdb\u578b\uff0c\u5982\u679c\u9759\u6001\u65b9\u6cd5\u64cd\u4f5c\u7684\u5f15\u7528\u6570\u636e\u7c7b\u578b\u4e0d\u786e\u5b9a\uff0c\u53ef\u4ee5\u5c06\u6cdb\u578b\u5b9a\u4e49\u5728\u65b9\u6cd5\u4e0a
\n\uff1f \u901a\u914d\u7b26\u3002\u4e5f\u53ef\u4ee5\u7406\u89e3\u4e3a\u5360\u4f4d\u7b26
\n\u6cdb\u578b\u7684\u9650\u5b9a\uff1a<\/p>\n
1.<? extands E> \u53ef\u4ee5\u63a5\u6536E\u7c7b\u578b\u6216\u8005E\u7684\u5b50\u7c7b\u578b\uff0c\u4e0a\u9650\u9650\u5b9a\n2.<? super E> \u53ef\u4ee5\u63a5\u6536E\u7c7b\u578b\u6216\u8005E\u7684\u7236\u7c7b\uff0c\u4e0b\u9650\u9650\u5b9a<\/pre>\n
<\/h1>\n
Map<\/strong><\/h1>\n
Map\u96c6\u5408\uff1a\u8be5\u96c6\u5408\u5b58\u50a8\u952e\u503c\u5bf9\uff0c\u4e00\u5bf9\u4e00\u5f80\u91cc\u5b58\uff0c\u800c\u4e14\u8981\u4fdd\u8bc1\u952e\u7684\u552f\u4e00\u6027
\n1.\u6dfb\u52a0
\nput(K key,V value)
\nputAll(Map,m)
\n2.\u5220\u9664
\nclear()
\nremove(Object key)
\n3.\u5224\u65ad
\ncontainsKey(Object key)
\ncontainsValue(Object value)
\nisEmpty()
\n4.\u83b7\u53d6
\nvalue get(Object key)
\nsize()
\nvalues()
\nentrySet()
\nkeySet()
\nMap<\/p>\n
  |--Hashtable    \u5e95\u5c42\u662f\u54c8\u5e0c\u8868\u6570\u636e\u7ed3\u6784\uff0c\u4e0d\u53ef\u4ee5\u5b58\u5165null\u952enull\u503c \u8be5\u96c6\u5408\u662f\u7ebf\u7a0b\u540c\u6b65\u7684\n  |--HashMap      \u5e95\u5c42\u662f\u54c8\u5e0c\u8868\u6570\u636e\u7ed3\u6784\uff0c\u5141\u8bb8\u4f7f\u7528null\u952enull\u503c  \u8be5\u96c6\u5408\u662f\u7ebf\u7a0b\u4e0d\u540c\u6b65\u7684\n  |--TreeMap      \u5e95\u5c42\u662f\u4e8c\u53c9\u6811\u6570\u636e\u7ed3\u6784\uff0c\u7ebf\u7a0b\u4e0d\u540c\u6b65\u3002\u53ef\u4ee5\u7528\u4e8e\u7ed9Map\u96c6\u5408\u4e2d\u7684\u952e\u8fdb\u884c\u6392\u5e8f\u548cSet\u5f88\u50cf\uff0c\u5176\u5b9eSet\u96c6\u5408\u4f4e\u5c42\u5c31\u662f\u4f7f\u7528\u7684Map\u96c6\u5408<\/pre>\n
 
\n\u53ef\u4ee5\u901a\u8fc7get\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u6765\u5224\u65ad\u4e00\u4e2a\u952e\u662f\u5426\u5b58\u5728\uff0c\u901a\u8fc7\u8fd4\u56denull\u6765\u5224\u65ad\u6dfb\u52a0\u5143\u7d20\u5982\u679c\u51fa\u73b0\u76f8\u540c\u7684\u952e\uff0c\u90a3\u4e48\u540e\u6dfb\u52a0\u7684\u503c\u4f1a\u8986\u76d6\u539f\u6709\u7684\u952e\u5bf9\u5e94\u7684\u503c\uff0c\u5e76put\u65b9\u6cd5\u4f1a\u8fd4\u56de\u88ab\u8986\u76d6\u7684\u503c
\nmap\u96c6\u5408\u7684\u4e24\u79cd\u53d6\u51fa\u65b9\u5f0f\uff1a
\n1.keySet\uff08\uff09\u00a0\u00a0 \u00a0\u5c06map\u4e2d\u6240\u6709\u7684\u952e\u5b58\u5165\u5230set\u96c6\u5408\uff0c\u56e0\u4e3aset\u96c6\u5408\u5177\u5907\u8fed\u4ee3\u5668\uff0c\u6240\u4ee5\u53ef\u4ee5\u901a\u8fc7\u8fed\u4ee3\u65b9\u5f0f\u53d6\u51fa\u6240\u6709\u7684\u952e\uff0c\u7136\u540e\u6839\u636eget\u65b9\u6cd5\uff0c\u83b7\u53d6\u6bcf\u4e00\u4e2a\u952e\u7684\u5bf9\u5e94\u503c
\nMap\u96c6\u5408\u7684\u53d6\u51fa\u539f\u7406\uff1a
\n\u5c06map\u96c6\u5408\u8f6c\u6362\u6210Set\u96c6\u5408\uff0c\u518d\u7528\u8fed\u4ee3\u5668\u53d6\u51fa
\n2.<Map.Entry<k,v>>\u3000entrySet\uff08\uff09\u5c06map\u96c6\u5408\u4e2d\u7684\u6620\u5c04\u5173\u7cfb\u5b58\u5165\u5230\u4e86set\u96c6\u5408\u4e2d\uff0c\u800c\u8fd9\u4e2a\u5173\u7cfb\u7684\u6570\u636e\u7c7b\u578b\u5c31\u662fMap.Entry
\nMap.Entry \u5176\u5b9eEntry\u4e5f\u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5b83\u662fMap\u63a5\u53e3\u4e2d\u7684\u4e00\u4e2a\u5185\u90e8\u63a5\u53e3<\/p>\n
interface Map{\n  public static interface Entry{\n    public abstract Object getKey();\n    public abstract Object getValue();\n  }\n}<\/pre>\n
 
\nmap\u6269\u5c55\u77e5\u8bc6\uff1a
\nmap\u96c6\u5408\u88ab\u4f7f\u7528\u662f\u56e0\u4e3a\u5177\u5907\u6620\u5c04\u5173\u7cfb
\n 
\n <\/p>\n
\u96c6\u5408\u6846\u67b6\u5de5\u5177\u7c7b<\/strong><\/h1>\n
Arrays
\nasList:\u5c06\u6570\u7ec4\u53d8\u6210\u96c6\u5408
\n\u628a\u6570\u7ec4\u53d8\u6210list\u96c6\u5408\u7684\u597d\u5904\u662f\u4ec0\u4e48
\n\u53ef\u4ee5\u4f7f\u7528\u96c6\u5408\u7684\u601d\u60f3\u548c\u65b9\u6cd5\u6765\u64cd\u4f5c\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff0c\u5c06\u6570\u7ec4\u53d8\u6210\u96c6\u5408\u00a0 \u4e0d\u53ef\u4ee5\u4f7f\u7528\u96c6\u5408\u7684\u589e\u5220\u65b9\u6cd5\uff0c\u56e0\u4e3a\u6570\u7ec4\u7684\u957f\u5ea6\u662f\u56fa\u5b9a\u7684\uff0c\u5982\u679c\u589e\u5220\u4e86\uff0c\u90a3\u4e48\u4f1a\u53d1\u751fUnsupportedOperationException
\n\u96c6\u5408\u53d8\u6570\u7ec4
\nCollection\u63a5\u53e3\u4e2d\u7684toArray\u65b9\u6cd5
\n\u6307\u5b9a\u7c7b\u578b\u7684\u6570\u7ec4\u5230\u5e95\u8981\u5b9a\u4e49\u591a\u957f\u5462
\n\u5f53\u6307\u5b9a\u7c7b\u578b\u7684\u6570\u7ec4\u957f\u5ea6\u5c0f\u4e8e\u4e86\u96c6\u5408\u7684size\uff0c\u90a3\u4e48\u8be5\u65b9\u6cd5\u5185\u90e8\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\u957f\u5ea6\u4e3a\u96c6\u5408\u7684size
\n\u5f53\u6307\u5b9a\u7c7b\u578b\u7684\u6570\u7ec4\u957f\u5ea6\u5927\u4e8e\u4e86\u96c6\u5408\u7684size\uff0c\u5c31\u4e0d\u4f1a\u65b0\u521b\u5efa\u6570\u7ec4\uff0c\u800c\u662f\u4f7f\u7528\u4f20\u9012\u8fdb\u6765\u7684\u6570\u7ec4\u6240\u4ee5\u521b\u5efa\u4e00\u4e2a\u521a\u521a\u597d\u7684\u6570\u7ec4\u6700\u4f18
\n\u4e3a\u4ec0\u4e48\u8981\u96c6\u5408\u53d8\u6570\u7ec4
\n\u4e3a\u4e86\u9650\u5b9a\u5bf9\u5143\u7d20\u7684\u64cd\u4f5c\uff0c\u4e0d\u9700\u8981\u8fdb\u884c\u589e\u5220\u4e86\u3002
\n\u9ad8\u7ea7for\u5faa\u73af
\n\u683c\u5f0f\uff1a<\/p>\n
for(\u6570\u636e\u7c7b\u578b \u53d8\u91cf\u540d\uff1a\u88ab\u904d\u5386\u7684\u96c6\u5408\uff08Collection\uff09\u6216\u8005\u6570\u7ec4\uff09{\n}<\/pre>\n
 
\n\u5bf9\u96c6\u5408\u8fdb\u884c\u904d\u5386
\n\u53ea\u80fd\u83b7\u53d6\u5143\u7d20\uff0c\u4f46\u662f\u4e0d\u80fd\u5bf9\u96c6\u5408\u8fdb\u884c\u64cd\u4f5c
\n\u8fed\u4ee3\u5668\uff1a
\n\u9664\u4e86\u904d\u5386\u8fd8\u53ef\u4ee5\u8fdb\u884cremove\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u7684\u52a8\u4f5c\uff0c\u5982\u679c\u4f7f\u7528ListIterator\uff0c\u8fd8\u53ef\u4ee5\u5728\u904d\u5386\u8fc7\u7a0b\u4e2d\u5bf9\u96c6\u5408\u8fdb\u884c\u589e\u5220\u6539\u67e5\u7684\u52a8\u4f5c
\n\u4f20\u7edf\u7684for\u548c\u9ad8\u7ea7\u7684for\u6709\u4ec0\u4e48\u533a\u522b
\n\u9ad8\u7ea7for\u6709\u5c40\u9650\u6027\uff0c\u5fc5\u987b\u6709\u88ab\u904d\u5386\u7684\u76ee\u6807\u3002
\n\u5efa\u8bae\u5728\u904d\u5386\u6570\u7ec4\u7684\u65f6\u5019\uff0c\u8fd8\u662f\u5e0c\u671b\u4f7f\u7528\u4f20\u7edffor\uff0c\u56e0\u4e3a\u4f20\u7edffor\u53ef\u4ee5\u5b9a\u4e49\u89d2\u6807
\n\u53ef\u53d8\u53c2\u6570
\n\u5176\u5b9e\u5c31\u662f\u6570\u7ec4\u53c2\u6570\u7684\u7b80\u5199\u5f62\u5f0f\uff0c\u4e0d\u7528\u6bcf\u4e00\u6b21\u90fd\u624b\u52a8\u7684\u5efa\u7acb\u6570\u7ec4\u5bf9\u8c61\uff0c\u53ea\u8981\u5c06\u8981\u64cd\u4f5c\u7684\u5143\u7d20\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u5373\u53ef\uff0c\u9690\u5f0f\u5c06\u8fd9\u4e9b\u53c2\u6570\u5c01\u88c5\u6210\u4e86\u6570\u7ec4
\n\u5728\u4f7f\u7528\u65b9\u6cd5\u7684\u53ef\u53d8\u53c2\u6570\u65f6\uff1a
\n\u6ce8\u610f\uff1a
\n\u53ef\u53d8\u53c2\u6570\u4e00\u5b9a\u8981\u5b9a\u4e49\u5728\u53c2\u6570\u5217\u8868\u7684\u6700\u540e\u9762
\n\u5f53\u7c7b\u540d\u91cd\u540d\u65f6\uff0c\u9700\u8981\u6307\u5b9a\u5177\u4f53\u7684\u5305\u540d
\n\u5f53\u65b9\u6cd5\u91cd\u540d\u65f6\uff0c\u6307\u5b9a\u5177\u5907\u6240\u5c5e\u7684\u5bf9\u8c61\u6216\u8005\u7c7b
\nSystem<\/strong>
\nSystem\u7c7b\u4e2d\u7684\u65b9\u6cd5\u548c\u5c5e\u6027\u90fd\u662f\u9759\u6001\u7684
\nout\u4ee3\u8868\u6807\u51c6\u8f93\u51fa\uff0c\u9ed8\u8ba4\u662f\u63a7\u5236\u53f0dos
\nin\u662f\u6807\u51c6\u8f93\u5165\uff0c\u9ed8\u8ba4\u952e\u76d8
\n\u63cf\u8ff0\u7cfb\u7edf\u7684\u4e00\u4e9b\u4fe1\u606f\uff1a
\n\u83b7\u53d6\u7cfb\u7edf\u5c5e\u6027\u4fe1\u606f\uff1agetProperties
\n\u56e0\u4e3aProperties\u662fhashtable\u7684\u5b50\u7c7b\uff0c\u4e5f\u5c31\u662fmap\u96c6\u5408\u91cd\u7684\u5b50\u7c7b\u5bf9\u8c61
\n\u53ef\u4ee5\u901a\u8fc7map\u7684\u65b9\u6cd5\u53d6\u51fa\u8be5\u96c6\u5408\u4e2d\u7684\u5143\u7d20
\n\u8be5\u96c6\u5408\u4e2d\u5b58\u50a8\u7684\u90fd\u662f\u5b57\u7b26\u4e32\uff0c\u6ca1\u6709\u6cdb\u578b\u5b9a\u4e49
\n\u5982\u4f55\u5728\u7cfb\u7edf\u4e2d\u81ea\u5b9a\u4e49\u7cfb\u7edf\u4fe1\u606f\u5462\uff1f<\/p>\n
System.setProperty(\"mykey\",\"myValue\");<\/pre>\n
\u83b7\u53d6\u6240\u6709\u5c5e\u6027\u4fe1\u606f<\/p>\n
for(Object obj:prop.keySet()){\n    String value = (String)prop.get(obj);\n    System.out.println(obj+\": \"+value);\n}<\/pre>\n
 
\n\u83b7\u53d6\u6307\u5b9a\u5c5e\u6027\u4fe1\u606f<\/p>\n
String osName = System.getProperty(\"os.name\");\nSystem.out.println(\"os name ;\"+osName);<\/pre>\n
 
\n <\/p>\n
Runtime\u5bf9\u8c61<\/strong><\/h1>\n
\u8be5\u7c7b\u4e2d\u5e76\u6ca1\u6709\u63d0\u4f9b\u6784\u9020\u51fd\u6570
\n\u8bf4\u660e\u4e0d\u53ef\u4ee5new\u5bf9\u8c61\uff0c\u90a3\u4e48\u4f1a\u76f4\u63a5\u60f3\u5230\u8be5\u7c7b\u4e2d\u7684\u65b9\u6cd5\u90fd\u662f\u9759\u6001\u7684\uff0c\u53d1\u73b0\u8be5\u7c7b\u4e2d\u8fd8\u6709\u975e\u9759\u6001\u65b9\u6cd5\uff0c\u8bf4\u660e\u8be5\u7c7b\u80af\u5b9a\u4f1a\u63d0\u4f9b\u4e86\u65b9\u6cd5\u83b7\u53d6\u672c\u7c7b\u5bf9\u8c61\uff0c\u800c\u4e14\u8be5\u65b9\u6cd5\u662f\u9759\u6001\u7684\uff0c\u5e76\u8fd4\u56de\u503c\u7c7b\u578b\u662f\u672c\u7c7b\u7c7b\u578b
\n\u7531\u8fd9\u4e2a\u7279\u70b9\u53ef\u4ee5\u770b\u51fa\u8be5\u7c7b\u4f7f\u7528\u4e86\u5355\u4f8b\u8bbe\u8ba1\u6a21\u5f0f\u5b8c\u6210\uff0c\u4fdd\u8bc1\u4e86\u5bf9\u8c61\u7684\u552f\u4e00\u6027
\n\u8be5\u65b9\u6cd5\u662f static Runtime getRuntime\uff08\uff09
\nMath<\/strong>
\nceil\u00a0\u00a0 \u00a0\u8fd4\u56de\u5927\u4e8e\u6307\u5b9a\u6570\u636e\u7684\u6700\u5c0f\u6574\u6570
\nfloor\u00a0\u00a0 \u00a0\u8fd4\u56de\u5c0f\u4e8e\u6307\u5b9a\u6570\u636e\u7684\u6700\u5927\u6574\u6570
\nround \u00a0\u00a0 \u00a0\u8fd4\u56de\u6307\u5b9a\u6570\u636e\u56db\u820d\u4e94\u5165\u7684\u503c
\nIO\u6d41<\/strong>
\n\u5b57\u7b26\u6d41\u548c\u5b57\u8282\u6d41
\n\u5b57\u8282\u6d41\u7684\u4e24\u4e2a\u57fa\u7c7b\uff1a
\nInputStream\u00a0\u00a0 \u00a0OutputStream
\n\u5b57\u7b26\u6d41\u7684\u4e24\u4e2a\u57fa\u7c7b\uff1a
\nReader\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0Writer
\n\u5148\u5b66\u4e60\u4e00\u4e0b\u5b57\u7b26\u6d41\u7684\u7279\u70b9
\n\u65e2\u7136IO\u6d41\u662f\u7528\u6765\u64cd\u4f5c\u6570\u636e\u7684\uff0c\u90a3\u4e48\u6570\u636e\u7684\u6700\u5e38\u89c1\u4f53\u73b0\u5f62\u5f0f\u662f\uff1a\u6587\u4ef6
\n\u90a3\u4e48\u5148\u4ee5\u64cd\u4f5c\u6587\u4ef6\u4e3a\u4e3b\u6765\u6f14\u793a
\n\u9700\u6c42\uff1a\u5728\u786c\u76d8\u4e0a\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\uff0c\u5e76\u5199\u5165\u6570\u636e
\n\u627e\u5230\u4e00\u4e2a\u4e13\u95e8\u7528\u4e8e\u64cd\u4f5c\u6587\u4ef6\u7684Writer\u5b50\u7c7b\u5bf9\u8c61\uff0cfileWriter\u3002\u540e\u7f00\u540d\u662f\u7236\u7c7b\u540d\uff0c\u524d\u7f00\u540d\u662f\u8be5\u6d41\u5bf9\u8c61\u7684\u529f\u80fd
\n1.\u521b\u5efa\u4e00\u4e2afileWriter\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u4e00\u88ab\u521d\u59cb\u5316\uff0c\u5c31\u5fc5\u987b\u8981\u660e\u786e\u88ab\u64cd\u4f5c\u7684\u6587\u4ef6
\n2.\u8c03\u7528write\u65b9\u6cd5\uff0c\u5c06\u6570\u636e\u5199\u5165\u6d41\u4e2d
\n3.\u8c03\u7528flush\u65b9\u6cd5 \u5237\u65b0\u6d41\u5bf9\u8c61\u4e2d\u7684\u7f13\u51b2\u4e2d\u7684\u6570\u636e
\n4.\u8c03\u7528close\u65b9\u6cd5\uff0c\u5173\u95ed\u6d41\u8d44\u6e90\uff0c\u4f46\u662f\u5173\u95ed\u4e4b\u524d\u4f1a\u5237\u65b0\u4e00\u6b21\u5185\u90e8\u7684\u7f13\u51b2\u4e2d\u7684\u6570\u636e
\n\u548cflush\u7684\u533a\u522b\uff1a
\n\u8c03\u7528flush\u5237\u65b0\u540e\uff0c\u6d41\u53ef\u4ee5\u7ee7\u7eed\u4f7f\u7528\uff0c\u4f46\u662fclose\u540e\uff0c\u6d41\u5c06\u4f1a\u5173\u95ed
\nIO\u5f02\u5e38\u7684\u5904\u7406\u65b9\u5f0f\uff1a<\/p>\n
FileWriter fw =null;\/\/!!!!!!!!!!!!!!!!!!\ntry {\n    fw = new FileWriter(\"Demo.txt\");\n    fw.write(\"abcdefg\");\n}catch (IOException e){\n    System.out.println(e.toString());\n}finally {\n    try {\n    if(fw!=null)\/\/!!!!!!!!!!!!!!!!!!!!!!!!\n        fw.close();\n} catch (IOException e) {\n    System.out.println(e.toString());\n  }\n}<\/pre>\n
 
\n <\/p>\n
\u7f13\u51b2\u533a<\/strong><\/h1>\n
\u7f13\u51b2\u533a\u7684\u51fa\u73b0\u662f\u4e3a\u4e86\u63d0\u9ad8\u6d41\u7684\u64cd\u4f5c\u6548\u7387\u800c\u51fa\u73b0\u7684
\n\u6240\u4ee5\u5728\u521b\u5efa\u7f13\u51b2\u533a\u4e4b\u524d\uff0c\u5fc5\u987b\u8981\u5148\u6709\u6d41\u5bf9\u8c61
\n\u5b57\u7b26\u6d41\u7f13\u51b2\u533a\uff1a
\n\u8be5\u7f13\u51b2\u533a\u63d0\u4f9b\u4e86\u4e00\u4e2a\u4e00\u6b21\u8bfb\u4e00\u884c\u7684\u65b9\u6cd5 readLine\uff0c\u65b9\u4fbf\u4e0e\u5bf9\u6587\u672c\u7684\u6570\u636e\u83b7\u53d6\uff0c\u5f53\u8fd4\u56denull\u65f6\uff0c\u8868\u793a\u8bfb\u5230\u6587\u4ef6\u672b\u5c3e
\nreadLine\u65b9\u6cd5\u8fd4\u56de\u7684\u65f6\u5019\u81f3\u8fd4\u56de\u56de\u8f66\u7b26\u4e4b\u524d\u7684\u5185\u5bb9\uff0c\u5e76\u4e0d\u8fd4\u56de\u56de\u8f66\u7b26
\nreadLine\u65b9\u6cd5\u7684\u539f\u7406
\n\u65e0\u8bba\u662f\u8bfb\u4e00\u884c\uff0c\u6216\u8005\u8bfb\u53d6\u591a\u5c11\u4e2a\u5b57\u7b26\uff0c\u5176\u5b9e\u6700\u7ec8\u90fd\u662f\u5728\u786c\u76d8\u4e0a\u4e00\u4e2a\u4e00\u4e2a\u83b7\u53d6\uff0c\u6240\u4ee5\u6700\u7ec8\u4f7f\u7528\u7684\u8fd8\u662fread\u65b9\u6cd5\u4e00\u6b21\u8bfb\u4e00\u4e2a\u7684\u65b9\u6cd5\u3002
\n\u88c5\u9970\u8bbe\u8ba1\u6a21\u5f0f\uff1a
\n\u5f53\u60f3\u8981\u5bf9\u5df2\u6709\u7684\u5bf9\u8c61\u8fdb\u884c\u529f\u80fd\u589e\u5f3a\u65f6\uff0c
\n\u53ef\u4ee5\u5b9a\u4e49\u7c7b\uff0c\u5c06\u5df2\u6709\u5bf9\u8c61\u4f20\u5165\uff0c\u57fa\u4e8e\u5df2\u6709\u5bf9\u8c61\u529f\u80fd\uff0c\u5e76\u63d0\u4f9b\u52a0\u5f3a\u529f\u80fd\uff0c\u90a3\u4e48\u81ea\u5b9a\u4e49\u7684\u8be5\u7c7b\u6210\u4e3a\u88c5\u9970\u7c7b\u3002
\n\u88c5\u9970\u7c7b\u901a\u5e38\u4f1a\u901a\u8fc7\u6784\u9020\u65b9\u6cd5\u63a5\u6536\u88ab\u88c5\u9970\u7684\u5bf9\u8c61
\n\u5e76\u57fa\u4e8e\u88ab\u88c5\u9970\u7684\u5bf9\u8c61\u7684\u529f\u80fd\u63d0\u4f9b\u66f4\u5f3a\u7684\u529f\u80fd
\nMyReader\/\/\u4e13\u95e8\u7528\u4e8e\u8bfb\u53d6\u6570\u636e\u7684\u7c7b<\/p>\n
|---MyTextReader\n  |---MyBufferTextReader\n|---MyMediaReader\n  |---MyBufferMediaReader\n|---MyDataReader\n  |---MyBufferDataReader<\/pre>\n
\u88c5\u9970\u6bd4\u7ee7\u627f\u66f4\u7075\u6d3b\uff0c\u907f\u514d\u4e86\u7ee7\u627f\u4f53\u7cfb\u81c3\u80bf
\n\u800c\u4e14\u964d\u4f4e\u4e86\u7c7b\u4e0e\u7c7b\u4e4b\u95f4\u7684\u5173\u7cfb\u3002
\n\u88c5\u9970\u7c7b\uff1a\u56e0\u4e3a\u589e\u5f3a\u5df2\u6709\u5bf9\u8c61\uff0c\u5177\u5907\u7684\u529f\u80fd\u548c\u5df2\u6709\u5bf9\u8c61\u662f\u76f8\u540c\u7684\uff0c\u53ea\u4e0d\u8fc7\u63d0\u4f9b\u4e86\u66f4\u5f3a\u7684\u529f\u80fd\u6240\u4ee5\u88c5\u9970\u7c7b\u548c\u88ab\u88c5\u9970\u7c7b\u90fd\u5c5e\u4e8e\u4e00\u4e2a\u4f53\u7cfb\u4e2d\u7684
\n\u60f3\u8981\u64cd\u4f5c\u56fe\u7247\u6570\u636e\uff0c\u8fd9\u65f6\u5019\u5c31\u8981\u7528\u5230\u5b57\u8282\u6d41
\n\u590d\u5236\u4e00\u4e2a\u56fe\u7247
\n\u601d\u8def\uff1a
\n1.\u7528\u5b57\u8282\u8bfb\u53d6\u6d41\u5bf9\u8c61\u548c\u56fe\u7247\u5173\u8054
\n2.\u7528\u5b57\u8282\u5199\u5165\u6d41\u5bf9\u8c61\u521b\u5efa\u4e00\u4e2a\u56fe\u7247\u6587\u4ef6\uff0c\u7528\u4e8e\u5b58\u50a8\u83b7\u5f97\u5230\u7684\u56fe\u7247\u6570\u636e
\n3.\u901a\u8fc7\u5faa\u73af\u8bfb\u5199\uff0c\u5b8c\u6210\u6570\u636e\u7684\u5b58\u50a8
\n4.\u5173\u95ed\u8d44\u6e90
\n\u901a\u8fc7\u952e\u76d8\u5f55\u5165\u4e00\u884c\u6570\u636e\u5175\u6253\u5370\u5176\u5927\u5199\uff0c\u53d1\u73b0\u5176\u5b9e\u5c31\u662f\u8bfb\u4e00\u884c\u6570\u636e\u7684\u539f\u7406\uff0c\u4e5f\u5c31\u662freadLine\u65b9\u6cd5\uff0c\u80fd\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528readLine\u65b9\u6cd5\u6765\u5b8c\u6210\u952e\u76d8\u5f55\u5165\u7684\u4e00\u884c\u6570\u636e\u7684\u8bfb\u53d6\u5462
\nreadLine\u65b9\u6cd5\u662fBufferedReader\u7c7b\u4e2d\u7684\u65b9\u6cd5
\n\u800c\u952e\u76d8\u5f55\u5165\u7684read\u65b9\u6cd5\u662f\u5b57\u8282\u6d41\u7684InputSream\u7684\u65b9\u6cd5
\n\u90a3\u4e48\u80fd\u4e0d\u80fd\u5c06\u5b57\u8282\u6d41\u8f6c\u6210\u5b57\u7b26\u6d41\u518d\u4f7f\u7528\u5b57\u7b26\u6d41\u7f13\u51b2\u533a\u7684readLine\u65b9\u6cd5\u5462\uff1f<\/p>\n
BufferedWriter bfw = new BufferedWriter(newOutputStreamWriter(System.out));\/\/\uff08System.in\uff09<\/pre>\n
 
\n\u6d41\u64cd\u4f5c\u7684\u57fa\u672c\u89c4\u5f8b\uff1a
\n\u6700\u75db\u82e6\u7684\u5c31\u662f\u6d41\u5bf9\u8c61\u6709\u5f88\u591a\uff0c\u4e0d\u77e5\u9053\u8be5\u7528\u54ea\u4e00\u4e2a
\n\u901a\u8fc7\u4e09\u4e2a\u660e\u786e\u6765\u5b8c\u6210\uff1a
\n1.\u660e\u786e\u6e90\u548c\u76ee\u7684
\n\u6e90\uff1a\u8f93\u5165\u6d41 InputStream\u00a0\u00a0 \u00a0Reader
\n\u76ee\u7684\uff1a\u8f93\u51fa\u6d41\u00a0\u00a0 \u00a0OutputStream\u00a0\u00a0 \u00a0Writer
\n2.\u660e\u786e\u64cd\u4f5c\u7684\u6570\u636e\u662f\u5426\u4e3a\u7eaf\u6587\u672c
\n\u662f\uff1a\u5b57\u7b26\u6d41
\n\u4e0d\u662f\uff1a\u5b57\u8282\u6d41
\n3.\u5f53\u4f53\u7cfb\u660e\u786e\u540e\u518d\u660e\u786e\u8981\u4f7f\u7528\u54ea\u4e2a\u5177\u4f53\u7684\u5bf9\u8c61
\n\u901a\u8fc7\u8bbe\u5907\u6765\u8fdb\u884c\u533a\u5206\uff1a
\n\u6e90\u8bbe\u5907\uff1a\u5185\u5b58 \u786c\u76d8 \u952e\u76d8
\n\u76ee\u7684\u8bbe\u5907\uff1a\u5185\u5b58 \u786c\u76d8 \u63a7\u5236\u53f0
\nlog4j
\n 
\n <\/p>\n
File\u7c7b<\/strong><\/h1>\n
File\u7c7b\u5e38\u89c1\u65b9\u6cd5
\n1.\u521b\u5efa
\nboolean createNewFile\uff08\uff09\uff1b\u5728\u6307\u5b9a\u4f4d\u7f6e\u521b\u5efa\u6587\u4ef6\uff0c\u5982\u679c\u8be5\u6587\u4ef6\u5df2\u7ecf\u5b58\u5728\u5219\u4e0d\u521b\u5efa\uff0c\u8fd4\u56defalse\u548c\u8f93\u51fa\u6d41\u4e0d\u4e00\u6837\uff0c\u8f93\u51fa\u6d41\u5bf9\u8c61\u4e00\u5efa\u7acb\u5c31\u4f1a\u521b\u5efa\u6587\u4ef6\uff0c\u800c\u4e14\u6587\u4ef6\u5b58\u5728\u5219\u4f1a\u8986\u76d6
\nstatic File createTempFile\uff08\uff09\uff1b\u00a0 \u521b\u5efa\u4e34\u65f6\u6587\u4ef6.temp
\nboolean mkdir\uff08\uff09\uff1b\u521b\u5efa\u6587\u4ef6\u5939
\nboolean mkdirs\uff08\uff09\uff1b\u521b\u5efa\u591a\u7ea7\u6587\u4ef6\u5939
\n2.\u5220\u9664
\nboolean delete();\u5220\u9664\u5931\u8d25\u8fd4\u56defalse
\nvoid deleteOnExit();\u5728\u865a\u62df\u673a\u9000\u51fa\u7684\u65f6\u5019\u5220\u9664\u6587\u4ef6
\n3.\u5224\u65ad
\nboolean canExecute()\uff1b\u5224\u65ad\u662f\u5426\u662f\u53ef\u6267\u884c\u6587\u4ef6
\nboolean canRead()\uff1b
\nboolean canWrite()\uff1b
\nboolean exist\uff08\uff09\uff1b\u6587\u4ef6\u662f\u5426\u5b58\u5728
\nboolean isFile()\uff1b\u5224\u65ad\u662f\u5426\u4e3a\u6587\u4ef6
\nboolean isDirectory()\uff1b\u5224\u65ad\u662f\u5426\u4e3a\u76ee\u5f55
\nboolean isHidden()\uff1b\u5224\u65ad\u662f\u5426\u4e3a\u9690\u85cf\u6587\u4ef6
\n4.\u83b7\u53d6\u4fe1\u606f
\ngetName\uff08\uff09\uff1b\u83b7\u53d6\u540d\u79f0
\ngetPath\uff08\uff09\uff1b\u83b7\u53d6\u8def\u5f84
\ngetParent\uff08\uff09\uff1b\u83b7\u53d6\u7236\u76ee\u5f55\u00a0 \/\/\u8fd4\u56de\u7edd\u8def\u5f84\u7684\u7236\u76ee\u5f55\uff0c\u5982\u679c\u83b7\u53d6\u7684\u662f\u76f8\u5bf9\u8def\u5f84\uff0c\u8fd4\u56denull
\nlastModifid\uff08\uff09\uff1b\u83b7\u53d6\u6587\u4ef6\u6700\u540e\u4fee\u6539\u65f6\u95f4
\nlength\uff08\uff09\uff1b\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f
\n\u5728windows\u4e2d\uff0c\u5220\u9664\u76ee\u5f55\u662f\u4ece\u6700\u91cc\u9762\u5f80\u5916\u5220\u9664\u7684\u3002
\n\u65e2\u7136\u662f\u4ece\u91cc\u5f80\u5916\u5220\u9664\uff0c\u5c31\u9700\u8981\u7528\u5230\u9012\u5f52
\npropertoes \u662fhashTable\u7684\u5b50\u7c7b
\n\u4e5f\u5c31\u662f\u8bf4\u4ed6\u5177\u5907map\u96c6\u5408\u7684\u7279\u70b9\uff0c\u800c\u662f\u5b83\u91cc\u9762\u5b58\u50a8\u7684\u952e\u503c\u5bf9\u90fd\u662f\u5b57\u7b26\u4e32\uff0c\u662f\u96c6\u5408\u4e2d\u548cIO\u6280\u672f\u76f8\u7ed3\u5408\u7684\u5bb9\u5668
\n\u8be5\u5bf9\u8c61\u7684\u7279\u70b9\u53ef\u4ee5\u7528\u4e8e\u952e\u503c\u5bf9\u5f62\u5f0f\u7684\u914d\u7f6e\u6587\u4ef6\u90a3\u4e48\u52a0\u8f7d\u6570\u636e\u65f6\uff0c\u9700\u8981\u6570\u636e\u6709\u56fa\u5b9a\u683c\u5f0f\uff0c\u901a\u5e38 \u952e=\u503c
\ndom4j
\n\u6253\u5370\u6d41\uff1a
\n\u8be5\u6d41\u63d0\u4f9b\u4e86\u6253\u5370\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5c06\u5404\u79cd\u6570\u636e\u7c7b\u578b\u7684\u6570\u636e\u90fd\u539f\u6837\u6253\u5370<\/p>\n
\u5b57\u8282\u8f93\u51fa\u6d41<\/h5>\n
PrintStream
\n\u6784\u9020\u51fd\u6570\u53ef\u4ee5\u63a5\u6536\u7684\u53c2\u6570\u7c7b\u578b
\n1.file\u5bf9\u8c61 file
\n2.\u5b57\u7b26\u4e32\u8def\u5f84 String
\n3.\u5b57\u8282\u8f93\u51fa\u6d41 OutputStream<\/p>\n
\u5b57\u7b26\u8f93\u51fa\u6d41<\/h5>\n
PrintWriter
\n\u6784\u9020\u51fd\u6570\u53ef\u4ee5\u63a5\u6536\u7684\u53c2\u6570\u7c7b\u578b
\n1.file\u5bf9\u8c61 file
\n2.\u5b57\u7b26\u4e32\u8def\u5f84 String
\n3.\u5b57\u8282\u8f93\u51fa\u6d41 OutputStream
\n4.\u5b57\u7b26\u8f93\u51fa\u6d41 Writer
\nRandomAccessFile
\n\u8be5\u7c7b\u4e0d\u662fIO\u4f53\u7cfb\u4e2d\u5b50\u7c7b
\n\u800c\u662f\u76f4\u63a5\u7ee7\u627f\u81eaObject
\n\u4f46\u662f\uff0c\u4ed6\u662fIO\u5305\u4e2d\u7684\u6210\u5458\uff0c\u56e0\u4e3a\u4ed6\u5177\u5907\u8bfb\u5199\u529f\u80fd\uff0c\u5185\u90e8\u5c01\u88c5\u4e86\uff0c\u4e00\u4e2a\u6570\u7ec4\uff0c\u800c\u4e14\u901a\u8fc7\u6307\u9488\u5bf9\u6570\u7ec4\u8fdb\u884c\u64cd\u4f5c\uff0c\u53ef\u4ee5\u901a\u8fc7GetFilePointer\u83b7\u53d6\u6307\u9488\u4f4d\u7f6e\uff0c\u540c\u65f6\u53ef\u4ee5\u901a\u8fc7seek\u6539\u53d8\u6307\u9488\u7684\u4f4d\u7f6e
\n\u5176\u5b9e\u5b8c\u6210\u8bfb\u5199\u7684\u539f\u7406\u5c31\u662f\u5185\u90e8\u5c01\u88c5\u4e86\u5b57\u8282\u8f93\u5165\u6d41\u548c\u8f93\u51fa\u6d41
\n\u901a\u8fc7\u6784\u9020\u51fd\u6570\u53ef\u4ee5\u770b\u51fa\uff0c\u8be5\u7c7b\u53ea\u80fd\u64cd\u4f5c\u6587\u4ef6
\n\u800c\u4e14\u64cd\u4f5c\u6587\u4ef6\u8fd8\u6709\u6a21\u5f0f \u53ea\u8bfbr \u8bfb\u5199rw
\n\u5982\u679c\u6a21\u5f0f\u4e3a\u53ea\u8bfb\uff0c\u4e0d\u4f1a\u521b\u5efa\u6587\u4ef6\uff0c\u4f1a\u53bb\u8bfb\u53d6\u4e00\u4e2a\u5df2\u5b58\u5728\u7684\u6587\u4ef6
\n\u5982\u679c\u8be5\u6587\u4ef6\u4e0d\u5b58\u5728\uff0c\u5219\u4f1a\u51fa\u73b0\u5f02\u5e38
\n\u5982\u679c\u6a21\u5f0f\u4e3a\u8bfb\u5199\uff0c\u90a3\u4e48\u8981\u64cd\u4f5c\u7684\u6587\u4ef6\u4e0d\u5b58\u5728\uff0c\u4f1a\u81ea\u52a8\u521b\u5efa
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\n\u89e3\u7801\uff1a\u5b57\u8282\u6570\u7ec4\u53d8\u6210\u5b57\u7b26\u4e32
\n 
\n <\/p>\n
GUI\u56fe\u5f62\u7528\u6237\u754c\u9762<\/strong><\/h1>\n
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\n <\/p>\n
\u7f51\u7edc\u7f16\u7a0b<\/strong><\/h1>\n
\u6982\u8ff0:\uff08\u4e09\u8981\u7d20 IP \u7aef\u53e3 \u534f\u8bae\uff09
\n1.\u627e\u5230\u5bf9\u65b9IP
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\n 
\n <\/p>\n
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