\u7b2c\u4e00\uff0c\u8c08\u8c08final, finally, finalize\u7684\u533a\u522b\u3002
\n\u7b2c\u4e8c\uff0cAnonymous Inner Class (\u533f\u540d\u5185\u90e8\u7c7b) \u662f\u5426\u53ef\u4ee5extends(\u7ee7\u627f)\u5176\u5b83\u7c7b\uff0c\u662f\u5426\u53ef\u4ee5implements(\u5b9e\u73b0)interface(\u63a5\u53e3)?
\n\u7b2c\u4e09\uff0cStatic Nested Class \u548c Inner Class\u7684\u4e0d\u540c\uff0c\u8bf4\u5f97\u8d8a\u591a\u8d8a\u597d(\u9762\u8bd5\u9898\u6709\u7684\u5f88\u7b3c\u7edf)\u3002
\n\u7b2c\u56db\uff0c&\u548c&&\u7684\u533a\u522b\u3002
\n\u7b2c\u4e94\uff0cHashMap\u548cHashtable\u7684\u533a\u522b\u3002
\n\u7b2c\u516d\uff0cCollection \u548c Collections\u7684\u533a\u522b\u3002
\n\u7b2c\u4e03\uff0c\u4ec0\u4e48\u65f6\u5019\u7528assert\u3002
\n\u7b2c\u516b\uff0cGC\u662f\u4ec0\u4e48? \u4e3a\u4ec0\u4e48\u8981\u6709GC?
\n\u7b2c\u4e5d\uff0cString s = new String(“xyz”);\u521b\u5efa\u4e86\u51e0\u4e2aString Object?
\n\u7b2c\u5341\uff0cMath.round(11.5)\u7b49\u65bc\u591a\u5c11? Math.round(-11.5)\u7b49\u65bc\u591a\u5c11?
\n\u7b2c\u5341\u4e00\uff0cshort s1 = 1; s1 = s1 + 1;\u6709\u4ec0\u4e48\u9519? short s1 = 1; s1 += 1;\u6709\u4ec0\u4e48\u9519?
\n\u7b2c\u5341\u4e8c\uff0csleep() \u548c wait() \u6709\u4ec0\u4e48\u533a\u522b?
\n\u7b2c\u5341\u4e09\uff0cJava\u6709\u6ca1\u6709goto?
\n\u7b2c\u5341\u56db\uff0c\u6570\u7ec4\u6709\u6ca1\u6709length()\u8fd9\u4e2a\u65b9\u6cd5? String\u6709\u6ca1\u6709length()\u8fd9\u4e2a\u65b9\u6cd5?
\n\u7b2c\u5341\u4e94\uff0cOverload\u548cOverride\u7684\u533a\u522b\u3002Overloaded\u7684\u65b9\u6cd5\u662f\u5426\u53ef\u4ee5\u6539\u53d8\u8fd4\u56de\u503c\u7684\u7c7b\u578b?
\n\u7b2c\u5341\u516d\uff0cSet\u91cc\u7684\u5143\u7d20\u662f\u4e0d\u80fd\u91cd\u590d\u7684\uff0c\u90a3\u4e48\u7528\u4ec0\u4e48\u65b9\u6cd5\u6765\u533a\u5206\u91cd\u590d\u4e0e\u5426\u5462? \u662f\u7528==\u8fd8\u662fequals()? \u5b83\u4eec\u6709\u4f55\u533a\u522b?
\n\u7b2c\u5341\u4e03\uff0c\u7ed9\u6211\u4e00\u4e2a\u4f60\u6700\u5e38\u89c1\u5230\u7684runtime exception\u3002
\n\u7b2c\u5341\u516b\uff0cerror\u548cexception\u6709\u4ec0\u4e48\u533a\u522b?
\n\u7b2c\u5341\u4e5d\uff0cList, Set, Map\u662f\u5426\u7ee7\u627f\u81eaCollection\u63a5\u53e3?
\n\u7b2c\u4e8c\u5341\uff0cabstract class\u548cinterface\u6709\u4ec0\u4e48\u533a\u522b?
\n\u7b2c\u4e8c\u5341\u4e00\uff0cabstract\u7684method\u662f\u5426\u53ef\u540c\u65f6\u662fstatic,\u662f\u5426\u53ef\u540c\u65f6\u662fnative\uff0c\u662f\u5426\u53ef\u540c\u65f6\u662fsynchronized?
\n\u7b2c\u4e8c\u5341\u4e8c\uff0c\u63a5\u53e3\u662f\u5426\u53ef\u7ee7\u627f\u63a5\u53e3? \u62bd\u8c61\u7c7b\u662f\u5426\u53ef\u5b9e\u73b0(implements)\u63a5\u53e3? \u62bd\u8c61\u7c7b\u662f\u5426\u53ef\u7ee7\u627f\u5b9e\u4f53\u7c7b(concrete class)?
\n\u7b2c\u4e8c\u5341\u4e09\uff0c\u542f\u52a8\u4e00\u4e2a\u7ebf\u7a0b\u662f\u7528run()\u8fd8\u662fstart()?
\n\u7b2c\u4e8c\u5341\u56db\uff0c\u6784\u9020\u5668Constructor\u662f\u5426\u53ef\u88aboverride?
\n\u7b2c\u4e8c\u5341\u4e94\uff0c\u662f\u5426\u53ef\u4ee5\u7ee7\u627fString\u7c7b?
\n\u7b2c\u4e8c\u5341\u516d\uff0c\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u8fdb\u5165\u4e00\u4e2a\u5bf9\u8c61\u7684\u4e00\u4e2asynchronized\u65b9\u6cd5\u540e\uff0c\u5176\u5b83\u7ebf\u7a0b\u662f\u5426\u53ef\u8fdb\u5165\u6b64\u5bf9\u8c61\u7684\u5176\u5b83\u65b9\u6cd5?
\n\u7b2c\u4e8c\u5341\u4e03\uff0ctry {}\u91cc\u6709\u4e00\u4e2areturn\u8bed\u53e5\uff0c\u90a3\u4e48\u7d27\u8ddf\u5728\u8fd9\u4e2atry\u540e\u7684finally {}\u91cc\u7684code\u4f1a\u4e0d\u4f1a\u88ab\u6267\u884c\uff0c\u4ec0\u4e48\u65f6\u5019\u88ab\u6267\u884c\uff0c\u5728return\u524d\u8fd8\u662f\u540e?
\n\u7b2c\u4e8c\u5341\u516b\uff0c\u7f16\u7a0b\u9898: \u7528\u6700\u6709\u6548\u7387\u7684\u65b9\u6cd5\u7b97\u51fa2\u4e58\u4ee58\u7b49\u65bc\u51e0?
\n\u7b2c\u4e8c\u5341\u4e5d\uff0c\u4e24\u4e2a\u5bf9\u8c61\u503c\u76f8\u540c(x.equals(y) == true)\uff0c\u4f46\u5374\u53ef\u6709\u4e0d\u540c\u7684hash code\uff0c\u8fd9\u53e5\u8bdd\u5bf9\u4e0d\u5bf9?
\n\u7b2c\u4e09\u5341\uff0c\u5f53\u4e00\u4e2a\u5bf9\u8c61\u88ab\u5f53\u4f5c\u53c2\u6570\u4f20\u9012\u5230\u4e00\u4e2a\u65b9\u6cd5\u540e\uff0c\u6b64\u65b9\u6cd5\u53ef\u6539\u53d8\u8fd9\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u5e76\u53ef\u8fd4\u56de\u53d8\u5316\u540e\u7684\u7ed3\u679c\uff0c\u90a3\u4e48\u8fd9\u91cc\u5230\u5e95\u662f\u503c\u4f20\u9012\u8fd8\u662f\u5f15\u7528\u4f20\u9012?
\n\u7b2c\u4e09\u5341\u4e00\uff0cswtich\u662f\u5426\u80fd\u4f5c\u7528\u5728byte\u4e0a\uff0c\u662f\u5426\u80fd\u4f5c\u7528\u5728long\u4e0a\uff0c\u662f\u5426\u80fd\u4f5c\u7528\u5728String\u4e0a?
\n\u7b2c\u4e09\u5341\u4e8c\uff0c\u7f16\u7a0b\u9898: \u5199\u4e00\u4e2aSingleton\u51fa\u6765\u3002
\n\u4ee5\u4e0b\u662f\u7b54\u6848
\n\u7b2c\u4e00\uff0c\u8c08\u8c08final, finally, finalize\u7684\u533a\u522b\u3002
\nfinal\u2014\u4fee\u9970\u7b26\uff08\u5173\u952e\u5b57\uff09\u5982\u679c\u4e00\u4e2a\u7c7b\u88ab\u58f0\u660e\u4e3afinal\uff0c\u610f\u5473\u7740\u5b83\u4e0d\u80fd\u518d\u6d3e\u751f\u51fa\u65b0\u7684\u5b50\u7c7b\uff0c\u4e0d\u80fd\u4f5c\u4e3a\u7236\u7c7b\u88ab\u7ee7\u627f\u3002\u56e0\u6b64\u4e00\u4e2a\u7c7b\u4e0d\u80fd\u65e2\u88ab\u58f0\u660e\u4e3a abstract\u7684\uff0c\u53c8\u88ab\u58f0\u660e\u4e3afinal\u7684\u3002\u5c06\u53d8\u91cf\u6216\u65b9\u6cd5\u58f0\u660e\u4e3afinal\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u5b83\u4eec\u5728\u4f7f\u7528\u4e2d\u4e0d\u88ab\u6539\u53d8\u3002\u88ab\u58f0\u660e\u4e3afinal\u7684\u53d8\u91cf\u5fc5\u987b\u5728\u58f0\u660e\u65f6\u7ed9\u5b9a\u521d\u503c\uff0c\u800c\u5728\u4ee5\u540e\u7684\u5f15\u7528\u4e2d\u53ea\u80fd\u8bfb\u53d6\uff0c\u4e0d\u53ef\u4fee\u6539\u3002\u88ab\u58f0\u660e\u4e3afinal\u7684\u65b9\u6cd5\u4e5f\u540c\u6837\u53ea\u80fd\u4f7f\u7528\uff0c\u4e0d\u80fd\u91cd\u8f7d
\nfinally\u2014\u518d\u5f02\u5e38\u5904\u7406\u65f6\u63d0\u4f9b finally \u5757\u6765\u6267\u884c\u4efb\u4f55\u6e05\u9664\u64cd\u4f5c\u3002\u5982\u679c\u629b\u51fa\u4e00\u4e2a\u5f02\u5e38\uff0c\u90a3\u4e48\u76f8\u5339\u914d\u7684 catch \u5b50\u53e5\u5c31\u4f1a\u6267\u884c\uff0c\u7136\u540e\u63a7\u5236\u5c31\u4f1a\u8fdb\u5165 finally \u5757\uff08\u5982\u679c\u6709\u7684\u8bdd\uff09\u3002
\nfinalize\u2014\u65b9\u6cd5\u540d\u3002Java \u6280\u672f\u5141\u8bb8\u4f7f\u7528 finalize() \u65b9\u6cd5\u5728\u5783\u573e\u6536\u96c6\u5668\u5c06\u5bf9\u8c61\u4ece\u5185\u5b58\u4e2d\u6e05\u9664\u51fa\u53bb\u4e4b\u524d\u505a\u5fc5\u8981\u7684\u6e05\u7406\u5de5\u4f5c\u3002\u8fd9\u4e2a\u65b9\u6cd5\u662f\u7531\u5783\u573e\u6536\u96c6\u5668\u5728\u786e\u5b9a\u8fd9\u4e2a\u5bf9\u8c61\u6ca1\u6709\u88ab\u5f15\u7528\u65f6\u5bf9\u8fd9\u4e2a\u5bf9\u8c61\u8c03\u7528\u7684\u3002\u5b83\u662f\u5728 Object \u7c7b\u4e2d\u5b9a\u4e49\u7684\uff0c\u56e0\u6b64\u6240\u6709\u7684\u7c7b\u90fd\u7ee7\u627f\u4e86\u5b83\u3002\u5b50\u7c7b\u8986\u76d6 finalize() \u65b9\u6cd5\u4ee5\u6574\u7406\u7cfb\u7edf\u8d44\u6e90\u6216\u8005\u6267\u884c\u5176\u4ed6\u6e05\u7406\u5de5\u4f5c\u3002finalize() \u65b9\u6cd5\u662f\u5728\u5783\u573e\u6536\u96c6\u5668\u5220\u9664\u5bf9\u8c61\u4e4b\u524d\u5bf9\u8fd9\u4e2a\u5bf9\u8c61\u8c03\u7528\u7684\u3002
\n\u7b2c\u4e8c\uff0cAnonymous Inner Class (\u533f\u540d\u5185\u90e8\u7c7b) \u662f\u5426\u53ef\u4ee5extends(\u7ee7\u627f)\u5176\u5b83\u7c7b\uff0c\u662f\u5426\u53ef\u4ee5implements(\u5b9e\u73b0)interface(\u63a5\u53e3)?
\n\u533f\u540d\u7684\u5185\u90e8\u7c7b\u662f\u6ca1\u6709\u540d\u5b57\u7684\u5185\u90e8\u7c7b\u3002\u4e0d\u80fdextends(\u7ee7\u627f) \u5176\u5b83\u7c7b\uff0c\u4f46\u4e00\u4e2a\u5185\u90e8\u7c7b\u53ef\u4ee5\u4f5c\u4e3a\u4e00\u4e2a\u63a5\u53e3\uff0c\u7531\u53e6\u4e00\u4e2a\u5185\u90e8\u7c7b\u5b9e\u73b0\u3002
\n\u7b2c\u4e09\uff0cStatic Nested Class \u548c Inner Class\u7684\u4e0d\u540c\uff0c\u8bf4\u5f97\u8d8a\u591a\u8d8a\u597d(\u9762\u8bd5\u9898\u6709\u7684\u5f88\u7b3c\u7edf)\u3002
\nNested Class \uff08\u4e00\u822c\u662fC++\u7684\u8bf4\u6cd5\uff09\uff0cInner Class (\u4e00\u822c\u662fJAVA\u7684\u8bf4\u6cd5)\u3002Java\u5185\u90e8\u7c7b\u4e0eC++\u5d4c\u5957\u7c7b\u6700\u5927\u7684\u4e0d\u540c\u5c31\u5728\u4e8e\u662f\u5426\u6709\u6307\u5411\u5916\u90e8\u7684\u5f15\u7528\u4e0a\u3002\u5177\u4f53\u53ef\u89c1http: \/\/www.frontfree.net\/articles\/services\/view.asp?id=704&page=1
\n\u6ce8\uff1a \u9759\u6001\u5185\u90e8\u7c7b\uff08Inner Class\uff09\u610f\u5473\u77401\u521b\u5efa\u4e00\u4e2astatic\u5185\u90e8\u7c7b\u7684\u5bf9\u8c61\uff0c\u4e0d\u9700\u8981\u4e00\u4e2a\u5916\u90e8\u7c7b\u5bf9\u8c61\uff0c2\u4e0d\u80fd\u4ece\u4e00\u4e2astatic\u5185\u90e8\u7c7b\u7684\u4e00\u4e2a\u5bf9\u8c61\u8bbf\u95ee\u4e00\u4e2a\u5916\u90e8\u7c7b\u5bf9\u8c61
\n\u7b2c\u56db\uff0c&\u548c&&\u7684\u533a\u522b\u3002
\n&\u662f\u4f4d\u8fd0\u7b97\u7b26\u3002&&\u662f\u5e03\u5c14\u903b\u8f91\u8fd0\u7b97\u7b26\u3002
\n\u7b2c\u4e94\uff0cHashMap\u548cHashtable\u7684\u533a\u522b\u3002
\n\u90fd\u5c5e\u4e8eMap\u63a5\u53e3\u7684\u7c7b\uff0c\u5b9e\u73b0\u4e86\u5c06\u60df\u4e00\u952e\u6620\u5c04\u5230\u7279\u5b9a\u7684\u503c\u4e0a\u3002
\nHashMap \u7c7b\u6ca1\u6709\u5206\u7c7b\u6216\u8005\u6392\u5e8f\u3002\u5b83\u5141\u8bb8\u4e00\u4e2a null \u952e\u548c\u591a\u4e2a null \u503c\u3002
\nHashtable \u7c7b\u4f3c\u4e8e HashMap\uff0c\u4f46\u662f\u4e0d\u5141\u8bb8 null \u952e\u548c null \u503c\u3002\u5b83\u4e5f\u6bd4 HashMap \u6162\uff0c\u56e0\u4e3a\u5b83\u662f\u540c\u6b65\u7684\u3002
\n\u7b2c\u516d\uff0cCollection \u548c Collections\u7684\u533a\u522b\u3002
\nCollections\u662f\u4e2ajava.util\u4e0b\u7684\u7c7b\uff0c\u5b83\u5305\u542b\u6709\u5404\u79cd\u6709\u5173\u96c6\u5408\u64cd\u4f5c\u7684\u9759\u6001\u65b9\u6cd5\u3002
\nCollection\u662f\u4e2ajava.util\u4e0b\u7684\u63a5\u53e3\uff0c\u5b83\u662f\u5404\u79cd\u96c6\u5408\u7ed3\u6784\u7684\u7236\u63a5\u53e3\u3002
\n\u7b2c\u4e03\uff0c\u4ec0\u4e48\u65f6\u5019\u7528assert\u3002
\n\u65ad\u8a00\u662f\u4e00\u4e2a\u5305\u542b\u5e03\u5c14\u8868\u8fbe\u5f0f\u7684\u8bed\u53e5\uff0c\u5728\u6267\u884c\u8fd9\u4e2a\u8bed\u53e5\u65f6\u5047\u5b9a\u8be5\u8868\u8fbe\u5f0f\u4e3a true\u3002\u5982\u679c\u8868\u8fbe\u5f0f\u8ba1\u7b97\u4e3a false\uff0c\u90a3\u4e48\u7cfb\u7edf\u4f1a\u62a5\u544a\u4e00\u4e2a AssertionError\u3002\u5b83\u7528\u4e8e\u8c03\u8bd5\u76ee\u7684\uff1a
\nassert(a > 0); \/\/ throws an AssertionError if a <= 0
\n\u65ad\u8a00\u53ef\u4ee5\u6709\u4e24\u79cd\u5f62\u5f0f\uff1a
\nassert Expression1 ;
\nassert Expression1 : Expression2 ;
\nExpression1 \u5e94\u8be5\u603b\u662f\u4ea7\u751f\u4e00\u4e2a\u5e03\u5c14\u503c\u3002
\nExpression2 \u53ef\u4ee5\u662f\u5f97\u51fa\u4e00\u4e2a\u503c\u7684\u4efb\u610f\u8868\u8fbe\u5f0f\u3002\u8fd9\u4e2a\u503c\u7528\u4e8e\u751f\u6210\u663e\u793a\u66f4\u591a\u8c03\u8bd5\u4fe1\u606f\u7684 String \u6d88\u606f\u3002
\n\u65ad\u8a00\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u662f\u7981\u7528\u7684\u3002\u8981\u5728\u7f16\u8bd1\u65f6\u542f\u7528\u65ad\u8a00\uff0c\u9700\u8981\u4f7f\u7528 source 1.4 \u6807\u8bb0\uff1a
\njavac -source 1.4 Test.java
\n\u8981\u5728\u8fd0\u884c\u65f6\u542f\u7528\u65ad\u8a00\uff0c\u53ef\u4f7f\u7528 -enableassertions \u6216\u8005 -ea \u6807\u8bb0\u3002
\n\u8981\u5728\u8fd0\u884c\u65f6\u9009\u62e9\u7981\u7528\u65ad\u8a00\uff0c\u53ef\u4f7f\u7528 -da \u6216\u8005 -disableassertions \u6807\u8bb0\u3002
\n\u8981\u7cfb\u7edf\u7c7b\u4e2d\u542f\u7528\u65ad\u8a00\uff0c\u53ef\u4f7f\u7528 -esa \u6216\u8005 -dsa \u6807\u8bb0\u3002\u8fd8\u53ef\u4ee5\u5728\u5305\u7684\u57fa\u7840\u4e0a\u542f\u7528\u6216\u8005\u7981\u7528\u65ad\u8a00\u3002
\n\u53ef\u4ee5\u5728\u9884\u8ba1\u6b63\u5e38\u60c5\u51b5\u4e0b\u4e0d\u4f1a\u5230\u8fbe\u7684\u4efb\u4f55\u4f4d\u7f6e\u4e0a\u653e\u7f6e\u65ad\u8a00\u3002\u65ad\u8a00\u53ef\u4ee5\u7528\u4e8e\u9a8c\u8bc1\u4f20\u9012\u7ed9\u79c1\u6709\u65b9\u6cd5\u7684\u53c2\u6570\u3002\u4e0d\u8fc7\uff0c\u65ad\u8a00\u4e0d\u5e94\u8be5\u7528\u4e8e\u9a8c\u8bc1\u4f20\u9012\u7ed9\u516c\u6709\u65b9\u6cd5\u7684\u53c2\u6570\uff0c\u56e0\u4e3a\u4e0d\u7ba1\u662f\u5426\u542f\u7528\u4e86\u65ad\u8a00\uff0c\u516c\u6709\u65b9\u6cd5\u90fd\u5fc5\u987b\u68c0\u67e5\u5176\u53c2\u6570\u3002\u4e0d\u8fc7\uff0c\u65e2\u53ef\u4ee5\u5728\u516c\u6709\u65b9\u6cd5\u4e2d\uff0c\u4e5f\u53ef\u4ee5\u5728\u975e\u516c\u6709\u65b9\u6cd5\u4e2d\u5229\u7528\u65ad\u8a00\u6d4b\u8bd5\u540e\u7f6e\u6761\u4ef6\u3002\u53e6\u5916\uff0c\u65ad\u8a00\u4e0d\u5e94\u8be5\u4ee5\u4efb\u4f55\u65b9\u5f0f\u6539\u53d8\u7a0b\u5e8f\u7684\u72b6\u6001\u3002
\n\u7b2c\u516b\uff0cGC\u662f\u4ec0\u4e48? \u4e3a\u4ec0\u4e48\u8981\u6709GC? (\u57fa\u7840)\u3002
\nGC\u662f\u5783\u573e\u6536\u96c6\u5668\u3002Java \u7a0b\u5e8f\u5458\u4e0d\u7528\u62c5\u5fc3\u5185\u5b58\u7ba1\u7406\uff0c\u56e0\u4e3a\u5783\u573e\u6536\u96c6\u5668\u4f1a\u81ea\u52a8\u8fdb\u884c\u7ba1\u7406\u3002\u8981\u8bf7\u6c42\u5783\u573e\u6536\u96c6\uff0c\u53ef\u4ee5\u8c03\u7528\u4e0b\u9762\u7684\u65b9\u6cd5\u4e4b\u4e00\uff1a
\nSystem.gc()
\nRuntime.getRuntime().gc()
\n\u7b2c\u4e5d\uff0cString s = new String(“xyz”);\u521b\u5efa\u4e86\u51e0\u4e2aString Object?
\n\u4e24\u4e2a\u5bf9\u8c61\uff0c\u4e00\u4e2a\u662f\u201cxyx\u201d,\u4e00\u4e2a\u662f\u6307\u5411\u201cxyx\u201d\u7684\u5f15\u7528\u5bf9\u8c61s\u3002
\n\u7b2c\u5341\uff0cMath.round(11.5)\u7b49\u65bc\u591a\u5c11? Math.round(-11.5)\u7b49\u65bc\u591a\u5c11?
\nMath.round(11.5)\u8fd4\u56de\uff08long\uff0912\uff0cMath.round(-11.5)\u8fd4\u56de\uff08long\uff09-11;
\n\u7b2c\u5341\u4e00\uff0cshort s1 = 1; s1 = s1 + 1;\u6709\u4ec0\u4e48\u9519? short s1 = 1; s1 += 1;\u6709\u4ec0\u4e48\u9519?
\nshort s1 = 1; s1 = s1 + 1;\u6709\u9519\uff0cs1\u662fshort\u578b\uff0cs1+1\u662fint\u578b,\u4e0d\u80fd\u663e\u5f0f\u8f6c\u5316\u4e3ashort\u578b\u3002\u53ef\u4fee\u6539\u4e3as1 =(short)(s1 + 1) \u3002short s1 = 1; s1 += 1\u6b63\u786e\u3002
\n\u7b2c\u5341\u4e8c\uff0csleep() \u548c wait() \u6709\u4ec0\u4e48\u533a\u522b? \u641e\u7ebf\u7a0b\u7684\u6700\u7231
\nsleep()\u65b9\u6cd5\u662f\u4f7f\u7ebf\u7a0b\u505c\u6b62\u4e00\u6bb5\u65f6\u95f4\u7684\u65b9\u6cd5\u3002\u5728sleep \u65f6\u95f4\u95f4\u9694\u671f\u6ee1\u540e\uff0c\u7ebf\u7a0b\u4e0d\u4e00\u5b9a\u7acb\u5373\u6062\u590d\u6267\u884c\u3002\u8fd9\u662f\u56e0\u4e3a\u5728\u90a3\u4e2a\u65f6\u523b\uff0c\u5176\u5b83\u7ebf\u7a0b\u53ef\u80fd\u6b63\u5728\u8fd0\u884c\u800c\u4e14\u6ca1\u6709\u88ab\u8c03\u5ea6\u4e3a\u653e\u5f03\u6267\u884c\uff0c\u9664\u975e(a)\u201c\u9192\u6765\u201d\u7684\u7ebf\u7a0b\u5177\u6709\u66f4\u9ad8\u7684\u4f18\u5148\u7ea7
\n(b)\u6b63\u5728\u8fd0\u884c\u7684\u7ebf\u7a0b\u56e0\u4e3a\u5176\u5b83\u539f\u56e0\u800c\u963b\u585e\u3002
\nwait()\u662f\u7ebf\u7a0b\u4ea4\u4e92\u65f6\uff0c\u5982\u679c\u7ebf\u7a0b\u5bf9\u4e00\u4e2a\u540c\u6b65\u5bf9\u8c61x \u53d1\u51fa\u4e00\u4e2await()\u8c03\u7528\uff0c\u8be5\u7ebf\u7a0b\u4f1a\u6682\u505c\u6267\u884c\uff0c\u88ab\u8c03\u5bf9\u8c61\u8fdb\u5165\u7b49\u5f85\u72b6\u6001\uff0c\u76f4\u5230\u88ab\u5524\u9192\u6216\u7b49\u5f85\u65f6\u95f4\u5230\u3002
\n\u7b2c\u5341\u4e09\uff0cJava\u6709\u6ca1\u6709goto?
\nGoto\u2014java\u4e2d\u7684\u4fdd\u7559\u5b57\uff0c\u73b0\u5728\u6ca1\u6709\u5728java\u4e2d\u4f7f\u7528\u3002
\n\u7b2c\u5341\u56db\uff0c\u6570\u7ec4\u6709\u6ca1\u6709length()\u8fd9\u4e2a\u65b9\u6cd5? String\u6709\u6ca1\u6709length()\u8fd9\u4e2a\u65b9\u6cd5\uff1f
\n\u6570\u7ec4\u6ca1\u6709length()\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u6709length\u7684\u5c5e\u6027\u3002
\nString\u6709\u6709length()\u8fd9\u4e2a\u65b9\u6cd5\u3002
\n\u7b2c\u5341\u4e94\uff0cOverload\u548cOverride\u7684\u533a\u522b\u3002Overloaded\u7684\u65b9\u6cd5\u662f\u5426\u53ef\u4ee5\u6539\u53d8\u8fd4\u56de\u503c\u7684\u7c7b\u578b?
\n\u65b9\u6cd5\u7684\u91cd\u5199Overriding\u548c\u91cd\u8f7dOverloading\u662fJava\u591a\u6001\u6027\u7684\u4e0d\u540c\u8868\u73b0\u3002\u91cd\u5199Overriding\u662f\u7236\u7c7b\u4e0e\u5b50\u7c7b\u4e4b\u95f4\u591a\u6001\u6027\u7684\u4e00\u79cd\u8868\u73b0\uff0c\u91cd\u8f7dOverloading\u662f\u4e00\u4e2a\u7c7b\u4e2d\u591a\u6001\u6027\u7684\u4e00\u79cd\u8868\u73b0\u3002\u5982\u679c\u5728\u5b50\u7c7b\u4e2d\u5b9a\u4e49\u67d0\u65b9\u6cd5\u4e0e\u5176\u7236\u7c7b\u6709\u76f8\u540c\u7684\u540d\u79f0\u548c\u53c2\u6570\uff0c\u6211\u4eec\u8bf4\u8be5\u65b9\u6cd5\u88ab\u91cd\u5199 (Overriding)\u3002\u5b50\u7c7b\u7684\u5bf9\u8c61\u4f7f\u7528\u8fd9\u4e2a\u65b9\u6cd5\u65f6\uff0c\u5c06\u8c03\u7528\u5b50\u7c7b\u4e2d\u7684\u5b9a\u4e49\uff0c\u5bf9\u5b83\u800c\u8a00\uff0c\u7236\u7c7b\u4e2d\u7684\u5b9a\u4e49\u5982\u540c\u88ab\u201c\u5c4f\u853d\u201d\u4e86\u3002\u5982\u679c\u5728\u4e00\u4e2a\u7c7b\u4e2d\u5b9a\u4e49\u4e86\u591a\u4e2a\u540c\u540d\u7684\u65b9\u6cd5\uff0c\u5b83\u4eec\u6216\u6709\u4e0d\u540c\u7684\u53c2\u6570\u4e2a\u6570\u6216\u6709\u4e0d\u540c\u7684\u53c2\u6570\u7c7b\u578b\uff0c\u5219\u79f0\u4e3a\u65b9\u6cd5\u7684\u91cd\u8f7d(Overloading)\u3002Overloaded\u7684\u65b9\u6cd5\u662f\u53ef\u4ee5\u6539\u53d8\u8fd4\u56de\u503c\u7684\u7c7b\u578b\u3002
\n\u7b2c\u5341\u516d\uff0cSet\u91cc\u7684\u5143\u7d20\u662f\u4e0d\u80fd\u91cd\u590d\u7684\uff0c\u90a3\u4e48\u7528\u4ec0\u4e48\u65b9\u6cd5\u6765\u533a\u5206\u91cd\u590d\u4e0e\u5426\u5462? \u662f\u7528==\u8fd8\u662fequals()? \u5b83\u4eec\u6709\u4f55\u533a\u522b?
\nSet\u91cc\u7684\u5143\u7d20\u662f\u4e0d\u80fd\u91cd\u590d\u7684\uff0c\u90a3\u4e48\u7528iterator()\u65b9\u6cd5\u6765\u533a\u5206\u91cd\u590d\u4e0e\u5426\u3002equals()\u662f\u5224\u8bfb\u4e24\u4e2aSet\u662f\u5426\u76f8\u7b49\u3002
\nequals()\u548c==\u65b9\u6cd5\u51b3\u5b9a\u5f15\u7528\u503c\u662f\u5426\u6307\u5411\u540c\u4e00\u5bf9\u8c61equals()\u5728\u7c7b\u4e2d\u88ab\u8986\u76d6\uff0c\u4e3a\u7684\u662f\u5f53\u4e24\u4e2a\u5206\u79bb\u7684\u5bf9\u8c61\u7684\u5185\u5bb9\u548c\u7c7b\u578b\u76f8\u914d\u7684\u8bdd\uff0c\u8fd4\u56de\u771f\u503c\u3002
\n\u7b2c\u5341\u4e03\uff0c\u7ed9\u6211\u4e00\u4e2a\u4f60\u6700\u5e38\u89c1\u5230\u7684runtime exception\u3002
\nArithmeticException, ArrayStoreException, BufferOverflowException, BufferUnderflowException, CannotRedoException, CannotUndoException, ClassCastException, CMMException, ConcurrentModificationException, DOMException, EmptyStackException, IllegalArgumentException, IllegalMonitorStateException, IllegalPathStateException, IllegalStateException,
\nImagingOpException, IndexOutOfBoundsException, MissingResourceException, NegativeArraySizeException, NoSuchElementException, NullPointerException, ProfileDataException, ProviderException, RasterFormatException, SecurityException, SystemException, UndeclaredThrowableException, UnmodifiableSetException, UnsupportedOperationException
\n\u7b2c\u5341\u516b\uff0cerror\u548cexception\u6709\u4ec0\u4e48\u533a\u522b?
\nerror \u8868\u793a\u6062\u590d\u4e0d\u662f\u4e0d\u53ef\u80fd\u4f46\u5f88\u56f0\u96be\u7684\u60c5\u51b5\u4e0b\u7684\u4e00\u79cd\u4e25\u91cd\u95ee\u9898\u3002\u6bd4\u5982\u8bf4\u5185\u5b58\u6ea2\u51fa\u3002\u4e0d\u53ef\u80fd\u6307\u671b\u7a0b\u5e8f\u80fd\u5904\u7406\u8fd9\u6837\u7684\u60c5\u51b5\u3002
\nexception \u8868\u793a\u4e00\u79cd\u8bbe\u8ba1\u6216\u5b9e\u73b0\u95ee\u9898\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5b83\u8868\u793a\u5982\u679c\u7a0b\u5e8f\u8fd0\u884c\u6b63\u5e38\uff0c\u4ece\u4e0d\u4f1a\u53d1\u751f\u7684\u60c5\u51b5\u3002
\n\u7b2c\u5341\u4e5d\uff0cList, Set, Map\u662f\u5426\u7ee7\u627f\u81eaCollection\u63a5\u53e3?
\nList\uff0cSet\u662f
\nMap\u4e0d\u662f
\n\u7b2c\u4e8c\u5341\uff0cabstract class\u548cinterface\u6709\u4ec0\u4e48\u533a\u522b?
\n\u58f0\u660e\u65b9\u6cd5\u7684\u5b58\u5728\u800c\u4e0d\u53bb\u5b9e\u73b0\u5b83\u7684\u7c7b\u88ab\u53eb\u505a\u62bd\u8c61\u7c7b\uff08abstract class\uff09\uff0c\u5b83\u7528\u4e8e\u8981\u521b\u5efa\u4e00\u4e2a\u4f53\u73b0\u67d0\u4e9b\u57fa\u672c\u884c\u4e3a\u7684\u7c7b\uff0c\u5e76\u4e3a\u8be5\u7c7b\u58f0\u660e\u65b9\u6cd5\uff0c\u4f46\u4e0d\u80fd\u5728\u8be5\u7c7b\u4e2d\u5b9e\u73b0\u8be5\u7c7b\u7684\u60c5\u51b5\u3002\u4e0d\u80fd\u521b\u5efaabstract \u7c7b\u7684\u5b9e\u4f8b\u3002\u7136\u800c\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u53d8\u91cf\uff0c\u5176\u7c7b\u578b\u662f\u4e00\u4e2a\u62bd\u8c61\u7c7b\uff0c\u5e76\u8ba9\u5b83\u6307\u5411\u5177\u4f53\u5b50\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\u3002\u4e0d\u80fd\u6709\u62bd\u8c61\u6784\u9020\u51fd\u6570\u6216\u62bd\u8c61\u9759\u6001\u65b9\u6cd5\u3002Abstract \u7c7b\u7684\u5b50\u7c7b\u4e3a\u5b83\u4eec\u7236\u7c7b\u4e2d\u7684\u6240\u6709\u62bd\u8c61\u65b9\u6cd5\u63d0\u4f9b\u5b9e\u73b0\uff0c\u5426\u5219\u5b83\u4eec\u4e5f\u662f\u62bd\u8c61\u7c7b\u4e3a\u3002\u53d6\u800c\u4ee3\u4e4b\uff0c\u5728\u5b50\u7c7b\u4e2d\u5b9e\u73b0\u8be5\u65b9\u6cd5\u3002\u77e5\u9053\u5176\u884c\u4e3a\u7684\u5176\u5b83\u7c7b\u53ef\u4ee5\u5728\u7c7b\u4e2d\u5b9e\u73b0\u8fd9\u4e9b\u65b9\u6cd5\u3002
\n\u63a5\u53e3\uff08interface\uff09\u662f\u62bd\u8c61\u7c7b\u7684\u53d8\u4f53\u3002\u5728\u63a5\u53e3\u4e2d\uff0c\u6240\u6709\u65b9\u6cd5\u90fd\u662f\u62bd\u8c61\u7684\u3002\u591a\u7ee7\u627f\u6027\u53ef\u901a\u8fc7\u5b9e\u73b0\u8fd9\u6837\u7684\u63a5\u53e3\u800c\u83b7\u5f97\u3002\u63a5\u53e3\u4e2d\u7684\u6240\u6709\u65b9\u6cd5\u90fd\u662f\u62bd\u8c61\u7684\uff0c\u6ca1\u6709\u4e00\u4e2a\u6709\u7a0b\u5e8f\u4f53\u3002\u63a5\u53e3\u53ea\u53ef\u4ee5\u5b9a\u4e49static final\u6210\u5458\u53d8\u91cf\u3002\u63a5\u53e3\u7684\u5b9e\u73b0\u4e0e\u5b50\u7c7b\u76f8\u4f3c\uff0c\u9664\u4e86\u8be5\u5b9e\u73b0\u7c7b\u4e0d\u80fd\u4ece\u63a5\u53e3\u5b9a\u4e49\u4e2d\u7ee7\u627f\u884c\u4e3a\u3002\u5f53\u7c7b\u5b9e\u73b0\u7279\u6b8a\u63a5\u53e3\u65f6\uff0c\u5b83\u5b9a\u4e49\uff08\u5373\u5c06\u7a0b\u5e8f\u4f53\u7ed9\u4e88\uff09\u6240\u6709\u8fd9\u79cd\u63a5\u53e3\u7684\u65b9\u6cd5\u3002\u7136\u540e\uff0c\u5b83\u53ef\u4ee5\u5728\u5b9e\u73b0\u4e86\u8be5\u63a5\u53e3\u7684\u7c7b\u7684\u4efb\u4f55\u5bf9\u8c61\u4e0a\u8c03\u7528\u63a5\u53e3\u7684\u65b9\u6cd5\u3002\u7531\u4e8e\u6709\u62bd\u8c61\u7c7b\uff0c\u5b83\u5141\u8bb8\u4f7f\u7528\u63a5\u53e3\u540d\u4f5c\u4e3a\u5f15\u7528\u53d8\u91cf\u7684\u7c7b\u578b\u3002\u901a\u5e38\u7684\u52a8\u6001\u8054\u7f16\u5c06\u751f\u6548\u3002\u5f15\u7528\u53ef\u4ee5\u8f6c\u6362\u5230\u63a5\u53e3\u7c7b\u578b\u6216\u4ece\u63a5\u53e3\u7c7b\u578b\u8f6c\u6362\uff0cinstanceof \u8fd0\u7b97\u7b26\u53ef\u4ee5\u7528\u6765\u51b3\u5b9a\u67d0\u5bf9\u8c61\u7684\u7c7b\u662f\u5426\u5b9e\u73b0\u4e86\u63a5\u53e3\u3002
\n\u7b2c\u4e8c\u5341\u4e00\uff0cabstract\u7684method\u662f\u5426\u53ef\u540c\u65f6\u662fstatic,\u662f\u5426\u53ef\u540c\u65f6\u662fnative\uff0c\u662f\u5426\u53ef\u540c\u65f6\u662fsynchronized?
\n\u90fd\u4e0d\u80fd
\n\u7b2c\u4e8c\u5341\u4e8c\uff0c\u63a5\u53e3\u662f\u5426\u53ef\u7ee7\u627f\u63a5\u53e3? \u62bd\u8c61\u7c7b\u662f\u5426\u53ef\u5b9e\u73b0(implements)\u63a5\u53e3? \u62bd\u8c61\u7c7b\u662f\u5426\u53ef\u7ee7\u627f\u5b9e\u4f53\u7c7b(concrete class)?
\n\u63a5\u53e3\u53ef\u4ee5\u7ee7\u627f\u63a5\u53e3\u3002\u62bd\u8c61\u7c7b\u53ef\u4ee5\u5b9e\u73b0(implements)\u63a5\u53e3\uff0c\u62bd\u8c61\u7c7b\u662f\u5426\u53ef\u7ee7\u627f\u5b9e\u4f53\u7c7b\uff0c\u4f46\u524d\u63d0\u662f\u5b9e\u4f53\u7c7b\u5fc5\u987b\u6709\u660e\u786e\u7684\u6784\u9020\u51fd\u6570\u3002
\n\u7b2c\u4e8c\u5341\u4e09\uff0c\u542f\u52a8\u4e00\u4e2a\u7ebf\u7a0b\u662f\u7528run()\u8fd8\u662fstart()?
\n\u542f\u52a8\u4e00\u4e2a\u7ebf\u7a0b\u662f\u8c03\u7528start()\u65b9\u6cd5\uff0c\u4f7f\u7ebf\u7a0b\u6240\u4ee3\u8868\u7684\u865a\u62df\u5904\u7406\u673a\u5904\u4e8e\u53ef\u8fd0\u884c\u72b6\u6001\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u53ef\u4ee5\u7531JVM\u8c03\u5ea6\u5e76\u6267\u884c\u3002\u8fd9\u5e76\u4e0d\u610f\u5473\u7740\u7ebf\u7a0b\u5c31\u4f1a\u7acb\u5373\u8fd0\u884c\u3002run()\u65b9\u6cd5\u53ef\u4ee5\u4ea7\u751f\u5fc5\u987b\u9000\u51fa\u7684\u6807\u5fd7\u6765\u505c\u6b62\u4e00\u4e2a\u7ebf\u7a0b\u3002
\n\u7b2c\u4e8c\u5341\u56db\uff0c\u6784\u9020\u5668Constructor\u662f\u5426\u53ef\u88aboverride?
\n\u6784\u9020\u5668Constructor\u4e0d\u80fd\u88ab\u7ee7\u627f\uff0c\u56e0\u6b64\u4e0d\u80fd\u91cd\u5199Overriding\uff0c\u4f46\u53ef\u4ee5\u88ab\u91cd\u8f7dOverloading\u3002
\n\u7b2c\u4e8c\u5341\u4e94\uff0c\u662f\u5426\u53ef\u4ee5\u7ee7\u627fString\u7c7b?
\nString\u7c7b\u662ffinal\u7c7b\u6545\u4e0d\u53ef\u4ee5\u7ee7\u627f\u3002
\n\u7b2c\u4e8c\u5341\u516d\uff0c\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u8fdb\u5165\u4e00\u4e2a\u5bf9\u8c61\u7684\u4e00\u4e2asynchronized\u65b9\u6cd5\u540e\uff0c\u5176\u5b83\u7ebf\u7a0b\u662f\u5426\u53ef\u8fdb\u5165\u6b64\u5bf9\u8c61\u7684\u5176\u5b83\u65b9\u6cd5?
\n\u4e0d\u80fd\uff0c\u4e00\u4e2a\u5bf9\u8c61\u7684\u4e00\u4e2asynchronized\u65b9\u6cd5\u53ea\u80fd\u7531\u4e00\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u3002
\n\u7b2c\u4e8c\u5341\u4e03\uff0ctry {}\u91cc\u6709\u4e00\u4e2areturn\u8bed\u53e5\uff0c\u90a3\u4e48\u7d27\u8ddf\u5728\u8fd9\u4e2atry\u540e\u7684finally {}\u91cc\u7684code\u4f1a\u4e0d\u4f1a\u88ab\u6267\u884c\uff0c\u4ec0\u4e48\u65f6\u5019\u88ab\u6267\u884c\uff0c\u5728return\u524d\u8fd8\u662f\u540e?
\n\u4f1a\u6267\u884c\uff0c\u5728return\u524d\u6267\u884c\u3002
\n\u7b2c\u4e8c\u5341\u516b\uff0c\u7f16\u7a0b\u9898: \u7528\u6700\u6709\u6548\u7387\u7684\u65b9\u6cd5\u7b97\u51fa2\u4e58\u4ee58\u7b49\u65bc\u51e0?
\n\u6709C\u80cc\u666f\u7684\u7a0b\u5e8f\u5458\u7279\u522b\u559c\u6b22\u95ee\u8fd9\u79cd\u95ee\u9898\u3002
\n2 << 3
\n\u7b2c\u4e8c\u5341\u4e5d\uff0c\u4e24\u4e2a\u5bf9\u8c61\u503c\u76f8\u540c(x.equals(y) == true)\uff0c\u4f46\u5374\u53ef\u6709\u4e0d\u540c\u7684hash code\uff0c\u8fd9\u53e5\u8bdd\u5bf9\u4e0d\u5bf9?
\n\u4e0d\u5bf9\uff0c\u6709\u76f8\u540c\u7684hash code\u3002
\n\u7b2c\u4e09\u5341\uff0c\u5f53\u4e00\u4e2a\u5bf9\u8c61\u88ab\u5f53\u4f5c\u53c2\u6570\u4f20\u9012\u5230\u4e00\u4e2a\u65b9\u6cd5\u540e\uff0c\u6b64\u65b9\u6cd5\u53ef\u6539\u53d8\u8fd9\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u5e76\u53ef\u8fd4\u56de\u53d8\u5316\u540e\u7684\u7ed3\u679c\uff0c\u90a3\u4e48\u8fd9\u91cc\u5230\u5e95\u662f\u503c\u4f20\u9012\u8fd8\u662f\u5f15\u7528\u4f20\u9012?
\n\u662f\u503c\u4f20\u9012\u3002Java \u7f16\u7a0b\u8bed\u8a00\u53ea\u7531\u503c\u4f20\u9012\u53c2\u6570\u3002\u5f53\u4e00\u4e2a\u5bf9\u8c61\u5b9e\u4f8b\u4f5c\u4e3a\u4e00\u4e2a\u53c2\u6570\u88ab\u4f20\u9012\u5230\u65b9\u6cd5\u4e2d\u65f6\uff0c\u53c2\u6570\u7684\u503c\u5c31\u662f\u5bf9\u8be5\u5bf9\u8c61\u7684\u5f15\u7528\u3002\u5bf9\u8c61\u7684\u5185\u5bb9\u53ef\u4ee5\u5728\u88ab\u8c03\u7528\u7684\u65b9\u6cd5\u4e2d\u6539\u53d8\uff0c\u4f46\u5bf9\u8c61\u7684\u5f15\u7528\u662f\u6c38\u8fdc\u4e0d\u4f1a\u6539\u53d8\u7684\u3002
\n\u7b2c\u4e09\u5341\u4e00\uff0cswtich\u662f\u5426\u80fd\u4f5c\u7528\u5728byte\u4e0a\uff0c\u662f\u5426\u80fd\u4f5c\u7528\u5728long\u4e0a\uff0c\u662f\u5426\u80fd\u4f5c\u7528\u5728String\u4e0a?
\nswitch\uff08expr1\uff09\u4e2d\uff0cexpr1\u662f\u4e00\u4e2a\u6574\u6570\u8868\u8fbe\u5f0f\u3002\u56e0\u6b64\u4f20\u9012\u7ed9 switch \u548c case \u8bed\u53e5\u7684\u53c2\u6570\u5e94\u8be5\u662f int\u3001 short\u3001 char \u6216\u8005 byte\u3002long,string \u90fd\u4e0d\u80fd\u4f5c\u7528\u4e8eswtich\u3002
\n\u7b2c\u4e09\u5341\u4e8c\uff0c\u7f16\u7a0b\u9898: \u5199\u4e00\u4e2aSingleton\u51fa\u6765\u3002
\nSingleton\u6a21\u5f0f\u4e3b\u8981\u4f5c\u7528\u662f\u4fdd\u8bc1\u5728Java\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u4e00\u4e2a\u7c7bClass\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b\u5b58\u5728\u3002
\n\u4e00\u822cSingleton\u6a21\u5f0f\u901a\u5e38\u6709\u51e0\u79cd\u79cd\u5f62\u5f0f:
\n\u7b2c\u4e00\u79cd\u5f62\u5f0f: \u5b9a\u4e49\u4e00\u4e2a\u7c7b\uff0c\u5b83\u7684\u6784\u9020\u51fd\u6570\u4e3aprivate\u7684\uff0c\u5b83\u6709\u4e00\u4e2astatic\u7684private\u7684\u8be5\u7c7b\u53d8\u91cf\uff0c\u5728\u7c7b\u521d\u59cb\u5316\u65f6\u5b9e\u4f8b\u8bdd\uff0c\u901a\u8fc7\u4e00\u4e2apublic\u7684getInstance\u65b9\u6cd5\u83b7\u53d6\u5bf9\u5b83\u7684\u5f15\u7528,\u7ee7\u800c\u8c03\u7528\u5176\u4e2d\u7684\u65b9\u6cd5\u3002
\npublic class Singleton {
\nprivate Singleton(){}
\n\/\/\u5728\u81ea\u5df1\u5185\u90e8\u5b9a\u4e49\u81ea\u5df1\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u662f\u4e0d\u662f\u5f88\u5947\u602a\uff1f
\n\/\/\u6ce8\u610f\u8fd9\u662fprivate \u53ea\u4f9b\u5185\u90e8\u8c03\u7528
\nprivate static Singleton instance = new Singleton();
\n\/\/\u8fd9\u91cc\u63d0\u4f9b\u4e86\u4e00\u4e2a\u4f9b\u5916\u90e8\u8bbf\u95ee\u672cclass\u7684\u9759\u6001\u65b9\u6cd5\uff0c\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee
\npublic static Singleton getInstance() {
\nreturn instance;
\n}
\n}
\n\u7b2c\u4e8c\u79cd\u5f62\u5f0f:
\npublic class Singleton {
\nprivate static Singleton instance = null;
\npublic static synchronized Singleton getInstance() {
\n\/\/\u8fd9\u4e2a\u65b9\u6cd5\u6bd4\u4e0a\u9762\u6709\u6240\u6539\u8fdb\uff0c\u4e0d\u7528\u6bcf\u6b21\u90fd\u8fdb\u884c\u751f\u6210\u5bf9\u8c61\uff0c\u53ea\u662f\u7b2c\u4e00\u6b21
\n\/\/\u4f7f\u7528\u65f6\u751f\u6210\u5b9e\u4f8b\uff0c\u63d0\u9ad8\u4e86\u6548\u7387\uff01
\nif (instance==null)
\ninstance\uff1dnew Singleton();
\nreturn instance; \u3000\u3000}
\n}
\n\u5176\u4ed6\u5f62\u5f0f:
\n\u5b9a\u4e49\u4e00\u4e2a\u7c7b\uff0c\u5b83\u7684\u6784\u9020\u51fd\u6570\u4e3aprivate\u7684\uff0c\u6240\u6709\u65b9\u6cd5\u4e3astatic\u7684\u3002
\n\u4e00\u822c\u8ba4\u4e3a\u7b2c\u4e00\u79cd\u5f62\u5f0f\u8981\u66f4\u52a0\u5b89\u5168\u4e9b
\n\u7b2c\u4e09\u5341\u4e09 Hashtable\u548cHashMap
\nHashtable\u7ee7\u627f\u81eaDictionary\u7c7b\uff0c\u800cHashMap\u662fJava1.2\u5f15\u8fdb\u7684Map interface\u7684\u4e00\u4e2a\u5b9e\u73b0
\nHashMap\u5141\u8bb8\u5c06null\u4f5c\u4e3a\u4e00\u4e2aentry\u7684key\u6216\u8005value\uff0c\u800cHashtable\u4e0d\u5141\u8bb8
\n\u8fd8\u6709\u5c31\u662f\uff0cHashMap\u628aHashtable\u7684contains\u65b9\u6cd5\u53bb\u6389\u4e86\uff0c\u6539\u6210containsvalue\u548ccontainsKey\u3002\u56e0\u4e3acontains\u65b9\u6cd5\u5bb9\u6613\u8ba9\u4eba\u5f15\u8d77\u8bef\u89e3\u3002
\n\u6700\u5927\u7684\u4e0d\u540c\u662f\uff0cHashtable\u7684\u65b9\u6cd5\u662fSynchronize\u7684\uff0c\u800cHashMap\u4e0d\u662f\uff0c\u5728
\n\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95eeHashtable\u65f6\uff0c\u4e0d\u9700\u8981\u81ea\u5df1\u4e3a\u5b83\u7684\u65b9\u6cd5\u5b9e\u73b0\u540c\u6b65\uff0c\u800cHashMap
\n\u5c31\u5fc5\u987b\u4e3a\u4e4b\u63d0\u4f9b\u5916\u540c\u6b65\u3002
\nHashtable\u548cHashMap\u91c7\u7528\u7684hash\/rehash\u7b97\u6cd5\u90fd\u5927\u6982\u4e00\u6837\uff0c\u6240\u4ee5\u6027\u80fd\u4e0d\u4f1a\u6709\u5f88\u5927\u7684\u5dee\u5f02\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u7b2c\u4e00\uff0c\u8c08\u8c08final, fina...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[379,512,326],"class_list":["post-193","post","type-post","status-publish","format-standard","hentry","category-2","tag-java","tag-512","tag-326"],"_links":{"self":[{"href":"https:\/\/out.cat\/index.php?rest_route=\/wp\/v2\/posts\/193","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/out.cat\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/out.cat\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/out.cat\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/out.cat\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=193"}],"version-history":[{"count":0,"href":"https:\/\/out.cat\/index.php?rest_route=\/wp\/v2\/posts\/193\/revisions"}],"wp:attachment":[{"href":"https:\/\/out.cat\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=193"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/out.cat\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=193"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/out.cat\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}