java 面试题 java两年经验面试都会问什么问题

java\u9762\u8bd5\u9898\uff1a\u5982\u4f55\u89e3\u51b3\u5185\u5b58\u6ea2\u51fa

\u3000\u3000\u7b2c\u4e00\u5bf9\u6240\u6709\u7684\u4ee3\u7801\u5305\u62ec\u9875\u9762\u4e2d\u7684java\u4ee3\u7801\u90fd\u8fdb\u884c\u4e00\u904d\u5f7b\u5e95\u7684\u56de\u987e\u68c0\u67e5\uff0c
1.\u5bf9\u90a3\u4e9b\u9759\u6001(static)\u7684\u5bf9\u8c61\u8981\u7279\u522b\u7559\u795e\uff0c\u7279\u522b\u662f\u7c7b\u578b\u4e3aMap,List,Set\u7684\uff0c\u9759\u6001\u7684\u53d8\u91cf\u4f1a\u4e00\u76f4\u9a7b\u5b58\u5728\u5185\u5b58\u4e2d\uff0c\u751f\u547d\u5468\u671f\u6bd4\u8f83\u957f\uff0c\u4e0d\u4f1a\u88ab\u5783\u573e\u5668\u56de\u6536\u3002
2\uff0e\u5bf9\u4e8e\u4ee3\u7801\uff0c\u8981\u5ba1\u67e5\u662f\u5426\u751f\u6210\u4e86\u5927\u91cf\u7684\u5197\u4f59\u7684\u5bf9\u8c61\uff0c\u8fd8\u6709\u4e00\u4e9b\u903b\u8f91\u4e1a\u52a1\u5904\u7406\u7684\u7c7b\uff0c
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3.Java\u4e2d\u7684\u5185\u5b58\u6ea2\u51fa\u5927\u90fd\u662f\u56e0\u4e3a\u6808\u4e2d\u7684\u53d8\u91cf\u592a\u591a\u4e86\u3002\u5176\u5b9e\u5185\u5b58\u6709\u7684\u662f\u3002\u5efa\u8bae\u4e0d\u7528\u7684\u5c3d\u91cf\u8bbe\u6210null\u4ee5\u4fbf\u56de\u6536\uff0c\u591a\u7528\u5c40\u90e8\u53d8\u91cf\uff0c\u5c11\u7528\u6210\u5458\u53d8\u91cf\u3002

1\uff09\uff0c\u53d8\u91cf\u6240\u5305\u542b\u7684\u5bf9\u8c61\u4f53\u79ef\u8f83\u5927\uff0c\u5360\u7528\u5185\u5b58\u8f83\u591a\u3002
2\uff09\uff0c\u53d8\u91cf\u6240\u5305\u542b\u7684\u5bf9\u8c61\u751f\u547d\u5468\u671f\u8f83\u957f\u3002
3\uff09\uff0c\u53d8\u91cf\u6240\u5305\u542b\u7684\u5bf9\u8c61\u6570\u636e\u7a33\u5b9a\u3002
4\uff09\uff0c\u8be5\u7c7b\u7684\u5bf9\u8c61\u5b9e\u4f8b\u6709\u5bf9\u8be5\u53d8\u91cf\u6240\u5305\u542b\u7684\u5bf9\u8c61\u7684\u5171\u4eab\u9700\u6c42\u3002
4\uff0e\u5728\u6211\u7684\u7a0b\u5e8f\u4e2d\u5bf9\u9759\u6001\u53d8\u91cf\u7684\u4f18\u5316\u540e\uff0c\u4f7f\u7a0b\u5e8f\u5360\u7528\u5185\u5b58\u91cf\u81f3\u5c11\u63d0\u5347\u4e865k-10k\u3002\u6240\u4ee5\u4e5f\u4e0d\u5bb9\u5ffd\u89c6\u3002

\u7b2c\u4e8c\u8fd8\u6709\u5c31\u662fString\u7c7b\u76f8\u5173\u7684\u4e1c\u897f\uff1a
1\uff0e\u5b57\u7b26\u4e32\u7d2f\u52a0\u7684\u65f6\u5019\u4e00\u5b9a\u8981\u7528StringBuffer\u7684append\u65b9\u6cd5\uff0c\u4e0d\u8981\u4f7f\u7528+\u64cd\u4f5c\u7b26\u8fde\u63a5\u4e24\u4e2a\u5b57\u7b26\u4e32\u3002\u5dee\u522b\u5f88\u5927\u3002\u800c\u4e14\u5728\u5faa\u73af\u6216\u67d0\u4e9b\u91cd\u590d\u6267\u884c\u7684\u52a8\u4f5c\u4e2d\u4e0d\u8981\u53bb\u521b\u5efaString\u5bf9\u8c61\uff0c\u56e0\u4e3aString\u5bf9\u8c61\u662f\u8981\u7528StringBuffer\u5bf9\u8c61\u6765\u5904\u7406\u7684\uff0c\u4e00\u4e2aString\u5bf9\u8c61\u5e94\u8be5\u662f\u4ea7\u751f\u4e86 3\u4e2a\u5bf9\u8c61\uff08\u5927\u6982\u662f\u8fd9\u6837\uff1a\uff09\uff09\u3002
2\uff0e\u5b57\u7b26\u4e32length()\u65b9\u6cd5\u6765\u53d6\u5f97\u5b57\u7b26\u4e32\u957f\u5ea6\u7684\u65f6\u5019\u4e0d\u8981\u628alength\u653e\u5230\u5faa\u73af\u4e2d\uff0c\u53ef\u4ee5\u5728\u5faa\u73af\u5916\u9762\u5bf9\u5176\u53d6\u503c\u3002(\u5305\u62ecvector\u7684size\u65b9\u6cd5)\u3002\u7279\u522b\u662f\u5faa\u73af\u6b21\u6570\u591a\u7684\u65f6\u5019\uff0c\u5c3d\u91cf\u628alength\u653e\u5230\u5faa\u73af\u5916\u9762\u3002
int size = xmlVector.size();
for (int i = 2; i < size; i++) {
...
}
3 .\u5199\u4ee3\u7801\u7684\u65f6\u5019\u5904\u7406\u5185\u5b58\u6ea2\u51fa
try{
//do sth
....
}catch (outofmemoryerror e){//\u53ef\u4ee5\u7528\u4e00\u4e2a\u5171\u901a\u51fd\u6570\u6765\u6267\u884c.
system.out.print (\u201cno memory! \u201d);
system.gc();
//do sth again
....
}
\u3000\u30004.\u5bf9\u4e8e\u9891\u7e41\u7533\u8bf7\u5185\u5b58\u548c\u91ca\u653e\u5185\u5b58\u7684\u64cd\u4f5c,\u8fd8\u662f\u81ea\u5df1\u63a7\u5236\u4e00\u4e0b\u6bd4\u8f83\u597d,\u4f46\u662fSystem.gc()\u7684\u65b9\u6cd5\u4e0d\u4e00\u5b9a\u9002\u7528\uff0c\u6700\u597d\u4f7f\u7528finallize\u5f3a\u5236\u6267\u884c\u6216\u8005\u5199\u81ea\u5df1\u7684finallize\u65b9\u6cd5\u3002 Java \u4e2d\u5e76\u4e0d\u4fdd\u8bc1\u6bcf\u6b21\u8c03\u7528\u8be5\u65b9\u6cd5\u5c31\u4e00\u5b9a\u80fd\u591f\u542f\u52a8\u5783\u573e\u6536\u96c6\uff0c\u5b83\u53ea\u4e0d\u8fc7\u4f1a\u5411JVM\u53d1\u51fa\u8fd9\u6837\u4e00\u4e2a\u7533\u8bf7\uff0c\u5230\u5e95\u662f\u5426\u771f\u6b63\u6267\u884c\u5783\u573e\u6536\u96c6\uff0c\u4e00\u5207\u90fd\u662f\u4e2a\u672a\u77e5\u6570\u3002

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2.\u6bd5\u4e1a\u4e8e\u4e00\u4e2a\u975e985/211\uff0c\u52c9\u5f3a\u4e0a\u4e00\u672c\u7684\u9ad8\u6821\u3002\u5206\u6790\uff1a\u8fd9\u4e2a\u76f8\u5bf9\u5f71\u54cd\u8f83\u5c0f\uff0c\u56e0\u4e3a\u6709\u5de5\u4f5c\u7ecf\u9a8c\u540e\uff0c\u516c\u53f8\u5bf9\u5b66\u6821\u7684\u8981\u6c42\u5c31\u6ca1\u90a3\u4e48\u9ad8\u4e86\uff0c\u53ea\u8981\u662f\u672c\u79d1\u5c31\u57fa\u672c\u6ca1\u95ee\u9898\uff0c\u4f46\u662f\u8fd8\u662f\u6709\u4e2a\u522b\u53fc\u6bdb\u516c\u53f8\u53ea\u8981985/211\u3002
3.\u524d\u4e00\u5bb6\u516c\u53f8\u662f\u4f20\u7edf\u7535\u4fe1\u884c\u4e1a\uff0c\u52a0\u5165\u9879\u76ee\u7ec4\u65f6\uff0c\u9879\u76ee\u5df2\u7ecf\u4e0a\u7ebf\u6709\u6bb5\u65f6\u95f4\u4e86\uff0c\u6211\u4eec\u7684\u4efb\u52a1\u5c31\u662f\u6709\u9700\u6c42\u5c31\u5f00\u53d1\uff0c\u6709bug\u5c31\u4f18\u5316\uff0c\u5176\u4ed6\u65f6\u95f4\u5c31\u804a\u9a9a\uff0c\u5404\u5e72\u5404\u7684\uff0c\u5de5\u4f5c\u4e00\u5e74\u591a\u8ddf\u5728\u517b\u8001\u4e00\u6837\uff0c\u7528\u4e00\u53e5\u8bdd\u8bf4\u5c31\u662f\u7f16\u7a0b5\u5206\u949f\uff0c\u626f\u6de12\u5c0f\u65f6\uff0c\u9879\u76ee\u7ecf\u9a8c\u4e25\u91cd\u4e0d\u8db3\uff0c\u6ca1\u5f00\u53d1\u8fc7\u5f88\u96be\u7684\u9700\u6c42\u3002\u5206\u6790\uff1a\u8fd9\u4e00\u70b9\u662f\u6700\u4f24\u7684\uff0c\u516c\u53f8\u62db\u6709\u7ecf\u9a8c\u7684\u5c31\u60f3\u770b\u4f60\u90fd\u5e72\u4e86\u4e9b\u4ec0\u4e48\u725b\u6279\u7684\u4e1c\u897f\uff0c\u7ed3\u679c\u4f60\u544a\u8bc9\u9762\u8bd5\u5b98\u6211\u5199\u7684\u9700\u6c42\u90fd\u662f\u5783\u573e\u3002
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1.\u5927\u5b66\u65f6\u62ff\u8fc7\u6bd4\u8f83\u591a\u7684\u5956\uff0c\u6bcf\u5e74\u90fd\u662f\u6821\u7ea7\u4f18\u79c0\u5b66\u751f\uff0c\u6bd5\u4e1a\u65f6\u662f\u5e02\u7ea7\u4f18\u79c0\u6bd5\u4e1a\u751f\uff0c\u62ff\u8fc7\u7701\u7ea7ACM\u4e8c\u7b49\u5956\u7b49\u3002\u5206\u6790\uff1a\u5927\u5b66\u7684\u8363\u8a89\u5bf9\u4e00\u4e2a\u6709\u5de5\u4f5c\u7ecf\u9a8c\u7684\u4eba\u6765\u8bf4\uff0c\u516c\u53f8\u4e0d\u4e00\u5b9a\u4f1a\u770b\u91cd\uff0c\u4f46\u662f\u53ef\u80fd\u4f1a\u5bf9\u9762\u8bd5\u5b98\u4ea7\u751f\u5fae\u5999\u7684\u5f71\u54cd\uff0c\u7279\u522b\u662fACM\u5956\uff0c\u6211\u78b0\u5230\u8fc7\u6709\u7684\u9762\u8bd5\u5b98\u4e5f\u662f\u641e\u8fc7ACM\u7684\uff0c\u6709\u5171\u540c\u7684\u8bdd\u9898\u804a\u8d77\u6765\u603b\u662f\u6bd4\u8f83\u5bb9\u6613\u7684\uff0c\u4f46\u662f\u4e5f\u8981\u6ce8\u610f\u4e0d\u80fd\u628a\u8fd9\u4e00\u680f\u7bc7\u5e45\u5199\u7684\u8fc7\u4e8e\u591a\uff0c\u53ea\u80fd\u5f53\u4f5c\u70b9\u7f00\u7528\uff0c\u6211\u5f53\u65f6\u662f\u653e\u5728\u7b80\u5386\u6700\u540e\u4e00\u680f\uff0c\u7b80\u8981\u7684\u5199\u4e86\u6700\u4e3b\u8981\u7684\u51e0\u4e2a\u5956\u3002
2.\u826f\u597d\u7684\u6c9f\u901a\u4ea4\u6d41\u80fd\u529b\u3002\u5206\u6790\uff1a\u8fd9\u4e2a\u80fd\u529b\u4e0d\u4f1a\u662f\u5173\u952e\u6027\u7684\uff0c\u4f46\u662f\u53ef\u4ee5\u52a0\u5206\u3002
3.\u8f83\u5f3a\u7684\u5b66\u4e60\u80fd\u529b\u548c\u903b\u8f91\u601d\u7ef4\u80fd\u529b\u3002\u5206\u6790\uff1a\u6709\u4e9b\u516c\u53f8\u548c\u9762\u8bd5\u5b98\u8fd8\u662f\u6bd4\u8f83\u770b\u91cd\u4e00\u4e2a\u4eba\u7684\u5b66\u4e60\u80fd\u529b\u7684\uff0c\u7ecf\u9a8c\u4ee3\u8868\u7740\u4f60\u73b0\u5728\u5728\u4ec0\u4e48\u7ea7\u522b\uff0c\u800c\u5b66\u4e60\u80fd\u529b\u5219\u4ee3\u8868\u7740\u4f60\u5c06\u6765\u80fd\u5230\u8fbe\u4ec0\u4e48\u7ea7\u522b\u3002
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1.\u770b\u9762\u8bd5\u9898
\u6b63\u5e38\u4eba\u7b2c\u4e00\u6b65\u80af\u5b9a\u90fd\u4f1a\u770b\u9762\u8bd5\u9898\uff0c\u6211\u4e5f\u4e0d\u4f8b\u5916\uff0c\u5728\u770b\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u53d1\u73b0\u6709\u4e9b\u6587\u7ae0\u5199\u7684\u4e0d\u9519\uff0c\u5bf9\u6211\u5e2e\u52a9\u4e0d\u5c0f\u503c\u5f97\u63a8\u8350\uff0c\u5982\u4e0b\uff1a
Java\u9762\u8bd5\u9898\u5168\u96c6\uff08\u4e0a\uff09\u5f88\u591a\u57fa\u7840\u7684\u4e1c\u897f\uff0c\u5efa\u8bae\u5148\u770b\u3002
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2.\u6df1\u5165\u5b66\u4e60
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zhangshixi\u7684Core java\u7cfb\u5217
3.\u719f\u6089\u9879\u76ee
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4.\u505a\u9762\u8bd5\u9898
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5.\u5b66\u4e60\u8bb0\u5f55
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\u6295\u7b80\u5386\u3001\u7ea6\u9762\u8bd5\u73af\u8282
1.\u5728\u54ea\u4e9b\u7f51\u7ad9\u6295\uff1f
\u62c9\u52fe\u7f51\u3001BOSS\u76f4\u8058\u3001\u730e\u8058\u7f51\u3002
2.\u662f\u5426\u8be5\u6d77\u6295\uff1f
\u6295\u7b80\u5386\u5206\u4e3a\u4e24\u4e2a\u60c5\u51b5\u3002
1\uff09\u6ca1\u6709\u793e\u62db\u9762\u8bd5\u7ecf\u9a8c\uff1a\u5efa\u8bae\u91c7\u53d6\u6d77\u6295\u7684\u65b9\u5f0f\uff0c\u53ea\u8981\u804c\u4f4d\u8981\u6c42\u8ddf\u81ea\u5df1\u6bd4\u8f83\u5339\u914d\u90fd\u53ef\u4ee5\u6295\uff0c\u7d2f\u8ba1\u9762\u8bd5\u7ecf\u9a8c\u3002\u8fd9\u4e2a\u73af\u8282\u53ef\u4ee5\u628a\u6295\u7b80\u5386\u7684\u7f51\u7ad9\u589e\u52a0\u4e24\u5bb6\uff1a\u667a\u8054\u548c\u65e0\u5fe7\u3002
2\uff09\u81ea\u8ba4\u4e3a\u793e\u62db\u9762\u8bd5\u7ecf\u9a8c\u5df2\u7ecf\u8db3\u591f\uff1a\u6295\u90a3\u4e9b\u804c\u4f4d\u5339\u914d\u3001\u516c\u53f8\u6ee1\u610f\u7684\u804c\u4f4d\u3002\u516c\u53f8\u8bc4\u4ef7\u53ef\u4ee5\u53bb\u770b\u51c6\u7f51\u3001\u767e\u5ea6\u3001\u77e5\u4e4e\u7b49\u67e5\u8be2\u3002
3.\u4e00\u5929\u7ea6\u51e0\u5bb6\u9762\u8bd5\u5408\u9002\uff1f
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4.\u6295\u7b80\u5386\u7ecf\u5e38\u6ca1\u4e0b\u6587\uff1f
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5.\u662f\u5426\u8be5\u88f8\u8f9e\uff1f
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6.\u6ce8\u610f\u4e8b\u9879
1\uff09\u9762\u8bd5\u524d\u4e00\u5929\u628a\u8def\u7ebf\u548c\u65f6\u95f4\u7b97\u597d\uff0c\u6700\u597d\u522b\u8fdf\u5230\u3002
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1.\u7b14\u8bd5\u5e38\u89c1\u7684\u95ee\u9898\uff1f
\u9762\u8bd5\u5e38\u89c1\u7684\u95ee\u9898\u4e0a\u9762\u7ed9\u7684\u9762\u8bd5\u9898\u94fe\u63a5\u57fa\u672c\u90fd\u6709\u3002\u6211\u53ea\u63d0\u51e0\u70b9\uff1a1\uff09\u5199SQL\uff1a\u5199SQL\u5f88\u5e38\u8003\u5bdfgroup by\u3001\u5185\u8fde\u63a5\u548c\u5916\u8fde\u63a5\u30022\uff09\u624b\u5199\u4ee3\u7801\uff1a\u624b\u5199\u4ee3\u7801\u4e00\u822c\u8003\u5355\u4f8b\u3001\u6392\u5e8f\u3001\u7ebf\u7a0b\u3001\u6d88\u8d39\u8005\u751f\u4ea7\u8005\u3002\u6211\u5efa\u8bae\u6392\u5e8f\u7b97\u6cd5\u9664\u4e86\u5192\u6ce1\u6392\u5e8f\uff0c\u6700\u597d\u8fd8\u80fd\u624b\u5199\u4e00\u79cd\u5176\u4ed6\u7684\u6392\u5e8f\u4ee3\u7801\u3002\u8bd5\u60f3\uff1a\u5982\u679c\u4e00\u822c\u9762\u8bd5\u8005\u90fd\u5199\u7684\u5192\u6ce1\u6392\u5e8f\uff0c\u800c\u4f60\u5199\u7684\u662f\u5feb\u901f\u6392\u5e8f/\u5806\u6392\u5e8f\uff0c\u80af\u5b9a\u80fd\u7ed9\u9762\u8bd5\u5b98\u7559\u4e0b\u4e0d\u9519\u7684\u5370\u8c61\u3002
2.\u9762\u8bd5\u6d41\u7a0b\uff1f
1\uff09\u8ba9\u4f60\u81ea\u6211\u4ecb\u7ecd
2\uff09\u95eeJava\u57fa\u7840\u77e5\u8bc6
3\uff09\u95ee\u9879\u76ee
4\uff09\u60c5\u666f\u95ee\u9898\uff0c\u4f8b\u5982\uff1a\u4f60\u7684\u4e00\u4e2a\u529f\u80fd\u4e0a\u4e86\u751f\u4ea7\u73af\u5883\u540e\uff0c\u670d\u52a1\u5668\u538b\u529b\u9aa4\u589e\uff0c\u8be5\u600e\u4e48\u6392\u67e5\u3002
5\uff09\u4f60\u6709\u4ec0\u4e48\u60f3\u95ee\u9762\u8bd5\u5b98\u7684
3.\u9762\u8bd5\u5e38\u95ee\u7684\u77e5\u8bc6\u70b9\uff1f
1\uff09\u96c6\u5408\u76f8\u5173\u95ee\u9898\uff08\u5fc5\u95ee\uff09\uff1a
HashMap\u3001LinkedHashMap\u3001ConcurrentHashMap\u3001ArrayList\u3001LinkedList\u7684\u5e95\u5c42\u5b9e\u73b0\u3002
HashMap\u548cHashtable\u7684\u533a\u522b\u3002
ArrayList\u3001LinkedList\u3001Vector\u7684\u533a\u522b\u3002
HashMap\u548cConcurrentHashMap\u7684\u533a\u522b\u3002
HashMap\u548cLinkedHashMap\u7684\u533a\u522b\u3002
HashMap\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u5417\u3002
ConcurrentHashMap\u662f\u600e\u4e48\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u3002
2\uff09\u7ebf\u7a0b\u76f8\u5173\u95ee\u9898\uff08\u5fc5\u95ee\uff09\uff1a
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\u4ec0\u4e48\u662f\u7ebf\u7a0b\u5b89\u5168\u3002
Runnable\u63a5\u53e3\u548cCallable\u63a5\u53e3\u7684\u533a\u522b\u3002
wait\u65b9\u6cd5\u548csleep\u65b9\u6cd5\u7684\u533a\u522b\u3002
synchronized\u3001Lock\u3001ReentrantLock\u3001ReadWriteLock\u3002
\u4ecb\u7ecd\u4e0bCAS(\u65e0\u9501\u6280\u672f)\u3002
\u4ec0\u4e48\u662fThreadLocal\u3002
\u521b\u5efa\u7ebf\u7a0b\u6c60\u76844\u79cd\u65b9\u5f0f\u3002
ThreadPoolExecutor\u7684\u5185\u90e8\u5de5\u4f5c\u539f\u7406\u3002
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3\uff09JVM\u76f8\u5173\u95ee\u9898\uff1a
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4\uff09\u8bbe\u8ba1\u6a21\u5f0f\u76f8\u5173\u95ee\u9898\uff08\u5fc5\u95ee\uff09\uff1a
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5\uff09\u6570\u636e\u5e93\u76f8\u5173\u95ee\u9898\uff0c\u9488\u5bf9Mysql\uff08\u5fc5\u95ee\uff09\uff1a
\u7ed9\u9898\u76ee\u8ba9\u4f60\u624b\u5199SQL\u3002
\u6709\u6ca1\u6709SQL\u4f18\u5316\u7ecf\u9a8c\u3002
Mysql\u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784\u3002
SQL\u600e\u4e48\u8fdb\u884c\u4f18\u5316\u3002
SQL\u5173\u952e\u5b57\u7684\u6267\u884c\u987a\u5e8f\u3002
\u6709\u54ea\u51e0\u79cd\u7d22\u5f15\u3002
\u4ec0\u4e48\u65f6\u5019\u8be5\uff08\u4e0d\u8be5\uff09\u5efa\u7d22\u5f15\u3002
Explain\u5305\u542b\u54ea\u4e9b\u5217\u3002
Explain\u7684Type\u5217\u6709\u54ea\u51e0\u79cd\u503c\u3002
6\uff09\u6846\u67b6\u76f8\u5173\u95ee\u9898\uff1a
Hibernate\u548cMybatis\u7684\u533a\u522b\u3002
Spring MVC\u548cStruts2\u7684\u533a\u522b\u3002
Spring\u7528\u4e86\u54ea\u4e9b\u8bbe\u8ba1\u6a21\u5f0f\u3002
Spring\u4e2dAOP\u4e3b\u8981\u7528\u6765\u505a\u4ec0\u4e48\u3002
Spring\u6ce8\u5165bean\u7684\u65b9\u5f0f\u3002
\u4ec0\u4e48\u662fIOC\uff0c\u4ec0\u4e48\u662f\u4f9d\u8d56\u6ce8\u5165\u3002
Spring\u662f\u5355\u4f8b\u8fd8\u662f\u591a\u4f8b\uff0c\u600e\u4e48\u4fee\u6539\u3002
Spring\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u548c\u4f20\u64ad\u6027\u3002
\u4ecb\u7ecd\u4e0bMybatis/Hibernate\u7684\u7f13\u5b58\u673a\u5236\u3002
Mybatis\u7684mapper\u6587\u4ef6\u4e2d#\u548c$\u7684\u533a\u522b\u3002
Mybatis\u7684mapper\u6587\u4ef6\u4e2dresultType\u548cresultMap\u7684\u533a\u522b\u3002
Mybatis\u4e2dDAO\u5c42\u63a5\u53e3\u6ca1\u6709\u5199\u5b9e\u73b0\u7c7b\uff0cMapper\u4e2d\u7684\u65b9\u6cd5\u548cDAO\u63a5\u53e3\u65b9\u6cd5\u662f\u600e\u4e48\u7ed1\u5b9a\u5230\u4e00\u8d77\u7684\uff0c\u5176\u5185\u90e8\u662f\u600e\u4e48\u5b9e\u73b0\u7684\u3002
7\uff09\u5176\u4ed6\u9047\u5230\u95ee\u9898\uff1a
\u4ecb\u7ecd\u4e0b\u6808\u548c\u961f\u5217\u3002
IO\u548cNIO\u7684\u533a\u522b\u3002
\u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u7684\u533a\u522b\u3002
int\u548cInteger\u7684\u81ea\u52a8\u62c6\u7bb1/\u88c5\u7bb1\u76f8\u5173\u95ee\u9898\u3002
\u5e38\u91cf\u6c60\u76f8\u5173\u95ee\u9898\u3002
==\u548cequals\u7684\u533a\u522b\u3002
\u91cd\u8f7d\u548c\u91cd\u5199\u7684\u533a\u522b\u3002
String\u548cStringBuilder\u3001StringBuffer\u7684\u533a\u522b\u3002
\u9759\u6001\u53d8\u91cf\u3001\u5b9e\u4f8b\u53d8\u91cf\u3001\u5c40\u90e8\u53d8\u91cf\u7ebf\u7a0b\u5b89\u5168\u5417\uff0c\u4e3a\u4ec0\u4e48\u3002
try\u3001catch\u3001finally\u90fd\u6709return\u8bed\u53e5\u65f6\u6267\u884c\u54ea\u4e2a\u3002
\u4ecb\u7ecd\u4e0bB\u6811\u3001\u4e8c\u53c9\u6811\u3002
ajax\u76844\u4e2a\u5b57\u6bcd\u5206\u522b\u662f\u4ec0\u4e48\u610f\u601d\u3002
xml\u5168\u79f0\u662f\u4ec0\u4e48\u3002
\u5206\u5e03\u5f0f\u9501\u7684\u5b9e\u73b0\u3002
\u5206\u5e03\u5f0fsession\u5b58\u50a8\u89e3\u51b3\u65b9\u6848\u3002
\u5e38\u7528\u7684linux\u547d\u4ee4\u3002
\u4e00\u4e9b\u7ecf\u9a8c\uff1a
1.\u5148\u6295\u4e00\u4e9b\u666e\u901a\u516c\u53f8\uff0c\u7b49\u9762\u51fa\u4e86\u5fc3\u5f97\u518d\u53bb\u6295\u7406\u60f3\u7684\u516c\u53f8\u3002
2.\u4e0d\u719f\u6089\u7684\u6280\u672f\u4e0d\u8981\u4e3b\u52a8\u63d0\u3002
3.\u5bf9\u4e8e\u90a3\u79cd\u5b9e\u4e60\u671f6\u4e2a\u6708\u8fd8\u62538\u6298\u7684\u516c\u53f8\uff0c\u9664\u975e\u4f60\u6ca1\u6709\u5176\u4ed6\u9009\u62e9\u4e86\uff0c\u5426\u5219\u4e0d\u8981\u53bb\u3002
4.\u5c0f\u516c\u53f8\u559c\u6b22\u5728\u85aa\u6c34\u4e0a\u538b\u4f60\uff0c\u5f00\u7684\u65f6\u5019\u9002\u5f53\u63d0\u9ad8\u3002
5.\u4e0d\u8981\u53bb\u53c2\u52a0\u62db\u8058\u4f1a\uff0c\u7eaf\u7cb9\u662f\u6d6a\u8d39\u65f6\u95f4\u3002
6.\u628a\u9762\u8bd5\u5f53\u4f5c\u4e00\u6b21\u6280\u672f\u7684\u4ea4\u6d41\uff0c\u4e0d\u8981\u592a\u5728\u610f\u662f\u5426\u80fd\u88ab\u5f55\u53d6\u3002
7.\u516c\u53f8\u4e00\u822c\u9762\u5b8c\u5c31\u51b3\u5b9a\u662f\u5426\u5f55\u53d6\u4e86\uff0c\u8ba9\u4f60\u56de\u53bb\u7b49\u6d88\u606f\u8fd9\u79cd\u60c5\u51b5\u4e00\u822c\u6ca1\u620f\uff0c\u65e0\u8bba\u4f60\u81ea\u5df1\u89c9\u5f97\u9762\u7684\u6709\u591a\u597d\u3002
8.\u5c3d\u91cf\u5c11\u901a\u8fc7\u7535\u8bdd\u9762\u8bd5\uff0c\u6548\u679c\u4e0d\u597d\u3002
9.\u5728\u9762\u8bd5\u7684\u65e5\u5b50\u91cc\uff0c\u8981\u4fdd\u6301\u6bcf\u5929\u5b66\u4e60\uff0c\u65e0\u8bba\u662f\u5b66\u4e60\u65b0\u4e1c\u897f\u8fd8\u662f\u590d\u4e60\u65e7\u4e1c\u897f\u3002
10.\u62ff\u5230offer\u4e86\uff0c\u95ee\u95ee\u81ea\u5df1\u8fd9\u4e2a\u516c\u53f8\u8ba9\u81ea\u5df1100%\u6ee1\u610f\u4e86\u5417\uff0c\u5982\u679c\u4e0d\u662f\uff0c\u8bf7\u7ee7\u7eed\u52aa\u529b\u627e\u66f4\u597d\u7684\u3002
11.\u901a\u8fc7\u9762\u8bd5\u5b98\u53ef\u4ee5\u5927\u6982\u5224\u65ad\u8fd9\u5bb6\u516c\u53f8\u7684\u60c5\u51b5\u3002
12.\u62c9\u52fe\u6295\u7684\u7b80\u5386\u5f88\u591a\u4f1a\u88ab\u7b5b\u6389\uff0c\u4f46\u662f\u62c9\u52fe\u8fd8\u662f\u9762\u8bd5\u673a\u4f1a\u7684\u6700\u4e3b\u8981\u6765\u6e90\u3002
13.\u7406\u60f3\u7684\u516c\u53f8\u53ef\u4ee5\u591a\u6295\u51e0\u6b21\uff0c\u6211\u6709\u597d\u51e0\u6b21\u90fd\u662f\u7b2c\u4e00\u6b21\u6295\u88ab\u7b5b\u6389\uff0c\u591a\u6295\u51e0\u6b21\u5c31\u8fc7\u7684\u7ecf\u9a8c\u3002
14.\u95ee\u5230\u81ea\u5df1\u6709\u6df1\u5165\u7814\u7a76\u8fc7\u7684\u77e5\u8bc6\uff0c\u6293\u4f4f\u673a\u4f1a\u597d\u597d\u8868\u73b0\uff0c\u4e0d\u8981\u8f7b\u6613\u653e\u8fc7\u3002

字符串反转
public String reset(String message)
{
StringBuffer buffer=new StringBuffer();
for (int i = message.length()-1; i >=0 ; i--) {
buffer.append(message.substring(i, i+1));
}
return buffer.toString();
}

/*
* message 字符串
*oldchar 要被替换的字符
* newChar 用来替换的字符
* */
public String test(String message,String oldchar,String newChar)
{
if(message.indexOf(oldchar)!=-1)
{
message=message.replace(oldchar, newChar);
}
return message;
}

1 递归
2 string类有对应函数

这是第一题的 第二题我怎么看都没看懂 。。
public class inversion {
public static void main(String[] args) {
String str = new java.util.Scanner(System.in).nextLine();
System.out.println(inversion.inversion(str));
}
public static String inversion(String str) {
char[] ch = str.toCharArray();
int size = ch.length;
char[] ch2 = new char[size];
for(int i=0,j=size-1;i<size;i++,j--) {
ch2[j] = ch[i];
}
return new String(ch2);
}
}

public String test(String str){
int l=str.length();
Char[] c=str.toCharArray();
for(int i=l-1;i>=0;i--){
System.out.println(c[l-1]);
}
}

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