\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u4e0d\u540c：ArrayList\u4f7f\u7528\u6570\u7ec4\u5b9e\u73b0，\u901a\u8fc7\u7d22\u5f15\u8fdb\u884c\u5feb\u901f\u8bbf\u95ee\u5143\u7d20\u3002LinkedList\u4f7f\u7528\u94fe\u8868\u5b9e\u73b0，\u901a\u8fc7\u8282\u70b9\u4e4b\u95f4\u7684\u6307\u9488\u8fdb\u884c\u5143\u7d20\u7684\u8bbf\u95ee\u548c\u64cd\u4f5c\u3002<\/p>\n<\/li>\n
\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u7684\u6548\u7387\u4e0d\u540c：ArrayList\u5728\u5c3e\u90e8\u7684\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u6548\u7387\u8f83\u9ad8，\u4f46\u5728\u4e2d\u95f4\u6216\u5f00\u5934\u7684\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u6548\u7387\u8f83\u4f4e，\u9700\u8981\u79fb\u52a8\u5143\u7d20\u3002LinkedList\u5728\u4efb\u610f\u4f4d\u7f6e\u7684\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u6548\u7387\u90fd\u6bd4\u8f83\u9ad8，\u56e0\u4e3a\u53ea\u9700\u8981\u8c03\u6574\u8282\u70b9\u4e4b\u95f4\u7684\u6307\u9488\u3002<\/p>\n<\/li>\n
\u968f\u673a\u8bbf\u95ee\u7684\u6548\u7387\u4e0d\u540c：ArrayList\u652f\u6301\u901a\u8fc7\u7d22\u5f15\u8fdb\u884c\u5feb\u901f\u968f\u673a\u8bbf\u95ee，\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(1)\u3002LinkedList\u9700\u8981\u4ece\u5934\u6216\u5c3e\u5f00\u59cb\u904d\u5386\u94fe\u8868，\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(n)\u3002<\/p>\n<\/li>\n
\u7a7a\u95f4\u5360\u7528：ArrayList\u5728\u521b\u5efa\u65f6\u9700\u8981\u5206\u914d\u4e00\u6bb5\u8fde\u7eed\u7684\u5185\u5b58\u7a7a\u95f4，\u56e0\u6b64\u4f1a\u5360\u7528\u8f83\u5927\u7684\u7a7a\u95f4\u3002LinkedList\u6bcf\u4e2a\u8282\u70b9\u53ea\u9700\u8981\u5b58\u50a8\u5143\u7d20\u548c\u6307\u9488，\u56e0\u6b64\u76f8\u5bf9\u8f83\u5c0f\u3002<\/p>\n<\/li>\n
\u4f7f\u7528\u573a\u666f：ArrayList\u9002\u7528\u4e8e\u9891\u7e41\u968f\u673a\u8bbf\u95ee\u548c\u5c3e\u90e8\u7684\u63d2\u5165\u5220\u9664\u64cd\u4f5c，\u800cLinkedList\u9002\u7528\u4e8e\u9891\u7e41\u7684\u4e2d\u95f4\u63d2\u5165\u5220\u9664\u64cd\u4f5c\u548c\u4e0d\u9700\u8981\u968f\u673a\u8bbf\u95ee\u7684\u573a\u666f\u3002<\/p>\n<\/li>\n
\u7ebf\u7a0b\u5b89\u5168：\u8fd9\u4e24\u4e2a\u96c6\u5408\u90fd\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684，Vector\u662f\u7ebf\u7a0b\u5b89\u5168\u7684<\/p>\n<\/li>\n<\/ul>\n
2. HashMap hash\u51b2\u7a81\u662f\u600e\u4e48\u89e3\u51b3\u7684？<\/h4>\n
\u5728 JDK 1.7 \u7248\u672c\u4e4b\u524d， HashMap \u6570\u636e\u7ed3\u6784\u662f\u6570\u7ec4\u548c\u94fe\u8868，HashMap\u901a\u8fc7\u54c8\u5e0c\u7b97\u6cd5\u5c06\u5143\u7d20\u7684\u952e（Key）\u6620\u5c04\u5230\u6570\u7ec4\u4e2d\u7684\u69fd\u4f4d（Bucket）\u3002<\/p>\n
\u5982\u679c\u591a\u4e2a\u952e\u6620\u5c04\u5230\u540c\u4e00\u4e2a\u69fd\u4f4d，\u5b83\u4eec\u4f1a\u4ee5\u94fe\u8868\u7684\u5f62\u5f0f\u5b58\u50a8\u5728\u540c\u4e00\u4e2a\u69fd\u4f4d\u4e0a，\u56e0\u4e3a\u94fe\u8868\u7684\u67e5\u8be2\u65f6\u95f4\u662fO(n)，\u6240\u4ee5\u51b2\u7a81\u5f88\u4e25\u91cd，\u4e00\u4e2a\u7d22\u5f15\u4e0a\u7684\u94fe\u8868\u975e\u5e38\u957f，\u6548\u7387\u5c31\u5f88\u4f4e\u4e86\u3002<\/p>\n
![\"\u56fe\u7247\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815100951-689f076f3dfe5.jpg\")
<\/p>\n
\u6240\u4ee5\u5728\u00a0JDK 1.8\u00a0\u7248\u672c\u7684\u65f6\u5019\u505a\u4e86\u4f18\u5316，\u5f53\u4e00\u4e2a\u94fe\u8868\u7684\u957f\u5ea6\u8d85\u8fc78\u7684\u65f6\u5019\u5c31\u8f6c\u6362\u6570\u636e\u7ed3\u6784，\u4e0d\u518d\u4f7f\u7528\u94fe\u8868\u5b58\u50a8，\u800c\u662f\u4f7f\u7528\u7ea2\u9ed1\u6811，\u67e5\u627e\u65f6\u4f7f\u7528\u7ea2\u9ed1\u6811，\u65f6\u95f4\u590d\u6742\u5ea6O（log n），\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd，\u4f46\u662f\u5728\u6570\u91cf\u8f83\u5c11\u65f6，\u5373\u6570\u91cf\u5c0f\u4e8e6\u65f6，\u4f1a\u5c06\u7ea2\u9ed1\u6811\u8f6c\u6362\u56de\u94fe\u8868\u3002<\/p>\n<\/p>\n
![\"\u56fe\u7247\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815100951-689f076fba315.jpg\")
<\/p>\n
3. HashMap \u6269\u5bb9\u673a\u5236\u662f\u600e\u6837\u7684？<\/h4>\n
hashMap\u9ed8\u8ba4\u7684\u8d1f\u8f7d\u56e0\u5b50\u662f0.75，\u5373\u5982\u679chashmap\u4e2d\u7684\u5143\u7d20\u4e2a\u6570\u8d85\u8fc7\u4e86\u603b\u5bb9\u91cf75%，\u5219\u4f1a\u89e6\u53d1\u6269\u5bb9，\u6269\u5bb9\u5206\u4e3a\u4e24\u4e2a\u6b65\u9aa4：<\/p>\n
- \n
- \n
\u7b2c1\u6b65\u662f\u5bf9\u54c8\u5e0c\u8868\u957f\u5ea6\u7684\u6269\u5c55（2\u500d）<\/p>\n<\/li>\n
- \n
\u7b2c2\u6b65\u662f\u5c06\u65e7\u54c8\u5e0c\u8868\u4e2d\u7684\u6570\u636e\u653e\u5230\u65b0\u7684\u54c8\u5e0c\u8868\u4e2d\u3002<\/p>\n<\/li>\n<\/ul>\n
\u56e0\u4e3a\u6211\u4eec\u4f7f\u7528\u7684\u662f2\u6b21\u5e42\u7684\u6269\u5c55(\u6307\u957f\u5ea6\u6269\u4e3a\u539f\u67652\u500d)，\u6240\u4ee5，\u5143\u7d20\u7684\u4f4d\u7f6e\u8981\u4e48\u662f\u5728\u539f\u4f4d\u7f6e，\u8981\u4e48\u662f\u5728\u539f\u4f4d\u7f6e\u518d\u79fb\u52a82\u6b21\u5e42\u7684\u4f4d\u7f6e\u3002<\/p>\n
\u5982\u6211\u4eec\u4ece16\u6269\u5c55\u4e3a32\u65f6，\u5177\u4f53\u7684\u53d8\u5316\u5982\u4e0b\u6240\u793a：<\/p>\n<\/p>\n
![\"\u56fe\u7247\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815100952-689f077039d62.jpg\")
<\/p>\n\u56e0\u6b64\u5143\u7d20\u5728\u91cd\u65b0\u8ba1\u7b97hash\u4e4b\u540e，\u56e0\u4e3an\u53d8\u4e3a2\u500d，\u90a3\u4e48n-1\u7684mask\u8303\u56f4\u5728\u9ad8\u4f4d\u591a1bit(\u7ea2\u8272)，\u56e0\u6b64\u65b0\u7684index\u5c31\u4f1a\u53d1\u751f\u8fd9\u6837\u7684\u53d8\u5316：<\/p>\n<\/p>\n
![\"\u56fe\u7247\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815100952-689f07707cf8f.jpg\")
<\/p>\n\u56e0\u6b64，\u6211\u4eec\u5728\u6269\u5145HashMap\u7684\u65f6\u5019，\u4e0d\u9700\u8981\u91cd\u65b0\u8ba1\u7b97hash，\u53ea\u9700\u8981\u770b\u770b\u539f\u6765\u7684hash\u503c\u65b0\u589e\u7684\u90a3\u4e2abit\u662f1\u8fd8\u662f0\u5c31\u597d\u4e86，\u662f0\u7684\u8bdd\u7d22\u5f15\u6ca1\u53d8，\u662f1\u7684\u8bdd\u7d22\u5f15\u53d8\u6210\u201c\u539f\u7d22\u5f15+oldCap\u201d\u3002\u53ef\u4ee5\u770b\u770b\u4e0b\u56fe\u4e3a16\u6269\u5145\u4e3a32\u7684resize\u793a\u610f\u56fe：<\/p>\n<\/p>\n
![\"\u56fe\u7247\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815100952-689f0770a5f3f.jpg\")
<\/p>\n\u8fd9\u4e2a\u8bbe\u8ba1\u786e\u5b9e\u975e\u5e38\u7684\u5de7\u5999，\u65e2\u7701\u53bb\u4e86\u91cd\u65b0\u8ba1\u7b97hash\u503c\u7684\u65f6\u95f4，\u800c\u4e14\u540c\u65f6，\u7531\u4e8e\u65b0\u589e\u76841bit\u662f0\u8fd8\u662f1\u53ef\u4ee5\u8ba4\u4e3a\u662f\u968f\u673a\u7684，\u56e0\u6b64resize\u7684\u8fc7\u7a0b，\u5747\u5300\u7684\u628a\u4e4b\u524d\u7684\u51b2\u7a81\u7684\u8282\u70b9\u5206\u6563\u5230\u65b0\u7684bucket\u4e86\u3002<\/p>\n
4. HashMap \u548c concurrentHashMap\u7684\u533a\u522b\u662f\u4ec0\u4e48？<\/h4>\n
JDK1.7\u7248\u672c：hashmap\u548cconcurrenthashmap\u7684\u533a\u522b<\/p>\n
- \n
- \n
\u5185\u5b58\u7ed3\u6784：hashmap\u91c7\u7528\u6570\u7ec4 + \u94fe\u8868\u7684\u7ed3\u6784\u3002\u6570\u7ec4\u662f\u00a0HashMap\u00a0\u7684\u4e3b\u4f53，\u94fe\u8868\u5219\u662f\u4e3a\u4e86\u89e3\u51b3\u54c8\u5e0c\u51b2\u7a81\u800c\u5b58\u5728\u3002\u5f53\u4e24\u4e2a\u4e0d\u540c\u7684\u952e\u901a\u8fc7\u54c8\u5e0c\u51fd\u6570\u8ba1\u7b97\u51fa\u76f8\u540c\u7684\u6570\u7ec4\u7d22\u5f15\u65f6，\u5b83\u4eec\u4f1a\u4ee5\u94fe\u8868\u7684\u5f62\u5f0f\u5b58\u50a8\u5728\u8be5\u7d22\u5f15\u4f4d\u7f6e\u3002ConcurrentHashMap\u91c7\u7528\u5206\u6bb5\u9501\u673a\u5236，\u5185\u90e8\u7ed3\u6784\u662f\u4e00\u4e2a\u00a0Segment\u00a0\u6570\u7ec4，\u6bcf\u4e2a\u00a0Segment\u00a0\u7c7b\u4f3c\u4e8e\u4e00\u4e2a\u5c0f\u7684\u00a0HashMap，\u5b83\u4e5f\u6709\u81ea\u5df1\u7684\u6570\u7ec4\u548c\u94fe\u8868\u7ed3\u6784\u3002<\/p>\n<\/li>\n
- \n
\u7ebf\u7a0b\u5b89\u5168\u6027：hashmap\u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684，\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b，\u5982\u679c\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u5bf9\u00a0HashMap\u00a0\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c，\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\u3001\u6b7b\u5faa\u73af\u7b49\u95ee\u9898\u3002ConcurrentHashMap\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002\u6bcf\u4e2a\u00a0Segment\u00a0\u90fd\u6709\u81ea\u5df1\u7684\u9501，\u4e0d\u540c\u7684\u00a0Segment\u00a0\u53ef\u4ee5\u88ab\u4e0d\u540c\u7684\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee，\u56e0\u6b64\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u53ef\u4ee5\u63d0\u9ad8\u5e76\u53d1\u6027\u80fd，\u53ea\u6709\u5f53\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u540c\u4e00\u4e2a\u00a0Segment\u00a0\u65f6，\u624d\u4f1a\u53d1\u751f\u9501\u7ade\u4e89\u3002<\/p>\n<\/li>\n
- \n
\u6027\u80fd：hashmap\u7531\u4e8e\u6ca1\u6709\u9501\u7684\u5f00\u9500，\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\u6027\u80fd\u8f83\u597d\u3002\u4f46\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b，\u4e3a\u4e86\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168，\u9700\u8981\u989d\u5916\u7684\u540c\u6b65\u673a\u5236，\u8fd9\u4f1a\u964d\u4f4e\u6027\u80fd\u3002ConcurrentHashMap\u901a\u8fc7\u5206\u6bb5\u9501\u673a\u5236，\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u53ef\u4ee5\u5b9e\u73b0\u66f4\u9ad8\u7684\u5e76\u53d1\u6027\u80fd，\u4e0d\u540c\u7684\u7ebf\u7a0b\u53ef\u4ee5\u540c\u65f6\u8bbf\u95ee\u4e0d\u540c\u7684\u00a0Segment，\u4ece\u800c\u51cf\u5c11\u4e86\u9501\u7ade\u4e89\u7684\u53ef\u80fd\u6027\u3002<\/p>\n<\/li>\n<\/ul>\n
JDK1.8\u7248\u672c：hashmap\u548cconcurrenthashmap\u7684\u533a\u522b<\/p>\n
- \n
- \n
\u5185\u5b58\u7ed3\u6784：hashmap\u91c7\u7528\u6570\u7ec4 + \u94fe\u8868 + \u7ea2\u9ed1\u6811\u7684\u7ed3\u6784，\u5f53\u94fe\u8868\u957f\u5ea6\u8d85\u8fc7\u4e00\u5b9a\u9608\u503c（\u9ed8\u8ba4\u4e3a 8）\u65f6，\u94fe\u8868\u4f1a\u8f6c\u6362\u4e3a\u7ea2\u9ed1\u6811，\u4ee5\u63d0\u9ad8\u67e5\u627e\u6548\u7387\u3002ConcurrentHashMap\u5f03\u4e86\u5206\u6bb5\u9501\u673a\u5236，\u91c7\u7528 CAS +\u00a0synchronized\u00a0\u6765\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168，\u5185\u90e8\u7ed3\u6784\u540c\u6837\u662f\u6570\u7ec4 + \u94fe\u8868 + \u7ea2\u9ed1\u6811\u3002<\/p>\n<\/li>\n
- \n
\u7ebf\u7a0b\u5b89\u5168\u6027：hashmap\u4ecd\u7136\u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684，\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u7684\u95ee\u9898\u4f9d\u7136\u5b58\u5728\u3002ConcurrentHashMap\u901a\u8fc7 CAS \u548c\u00a0synchronized\u00a0\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u3002\u5728\u63d2\u5165\u5143\u7d20\u65f6，\u9996\u5148\u4f1a\u5c1d\u8bd5\u4f7f\u7528 CAS \u64cd\u4f5c\u66f4\u65b0\u8282\u70b9，\u5982\u679c CAS \u5931\u8d25，\u5219\u4f7f\u7528\u00a0synchronized\u00a0\u9501\u4f4f\u5f53\u524d\u8282\u70b9，\u518d\u8fdb\u884c\u63d2\u5165\u64cd\u4f5c\u3002<\/p>\n<\/li>\n
- \n
\u6027\u80fd：hashmap\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b，\u7531\u4e8e\u7ea2\u9ed1\u6811\u7684\u5f15\u5165，\u5f53\u94fe\u8868\u8f83\u957f\u65f6\u67e5\u627e\u6548\u7387\u4f1a\u6709\u6240\u63d0\u9ad8\u3002ConcurrentHashMap\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b，\u7531\u4e8e\u6452\u5f03\u4e86\u5206\u6bb5\u9501，\u51cf\u5c11\u4e86\u9501\u7684\u7c92\u5ea6，\u8fdb\u4e00\u6b65\u63d0\u9ad8\u4e86\u5e76\u53d1\u6027\u80fd\u3002\u540c\u65f6，\u7ea2\u9ed1\u6811\u7684\u5f15\u5165\u4e5f\u63d0\u9ad8\u4e86\u67e5\u627e\u6548\u7387\u3002<\/p>\n<\/li>\n<\/ul>\n
5. new String（"ab"）\u521b\u5efa\u4e86\u51e0\u4e2a\u5bf9\u8c61？<\/h4>\n
\u4f7f\u7528\u00a0new String("ab")\u00a0\u53ef\u80fd\u521b\u5efa\u00a01 \u4e2a\u6216 2 \u4e2a\u5bf9\u8c61，\u5177\u4f53\u53d6\u51b3\u4e8e\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u7684\u72b6\u6001：<\/p>\n
- \n
- \n
\u5982\u679c\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u6ca1\u6709\u00a0"ab"：\u4f1a\u5148\u5728\u5e38\u91cf\u6c60\u4e2d\u521b\u5efa\u4e00\u4e2a "ab" \u5bf9\u8c61\u3002\u518d\u901a\u8fc7\u00a0new\u00a0\u5173\u952e\u5b57\u5728\u5806\u5185\u5b58\u4e2d\u521b\u5efa\u4e00\u4e2a\u65b0\u7684 String \u5bf9\u8c61（\u8be5\u5bf9\u8c61\u7684\u503c\u4e0e\u5e38\u91cf\u6c60\u4e2d\u7684 "ab" \u76f8\u540c）\u3002\u6b64\u65f6\u603b\u5171\u521b\u5efa\u00a02 \u4e2a\u5bf9\u8c61\u3002<\/p>\n<\/li>\n
- \n
\u5982\u679c\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u5df2\u6709\u00a0"ab"：\u4ec5\u901a\u8fc7\u00a0new\u00a0\u5173\u952e\u5b57\u5728\u5806\u5185\u5b58\u4e2d\u521b\u5efa\u4e00\u4e2a\u65b0\u7684 String \u5bf9\u8c61（\u5f15\u7528\u5e38\u91cf\u6c60\u4e2d\u7684 "ab" \u4f5c\u4e3a\u503c）\u3002\u6b64\u65f6\u603b\u5171\u521b\u5efa\u00a01 \u4e2a\u5bf9\u8c61\u3002<\/p>\n<\/li>\n<\/ul>\n
\u8fd9\u662f\u56e0\u4e3a\u00a0new String("ab")\u00a0\u4f1a\u5f3a\u5236\u5728\u5806\u4e2d\u751f\u6210\u65b0\u5bf9\u8c61，\u800c\u53cc\u5f15\u53f7\u76f4\u63a5\u58f0\u660e\u7684\u5b57\u7b26\u4e32（\u5982 "ab"）\u4f1a\u4f18\u5148\u4f7f\u7528\u5e38\u91cf\u6c60\u4e2d\u7684\u5bf9\u8c61\u4ee5\u5b9e\u73b0\u590d\u7528\u3002<\/p>\n
6. StringBuilder\u548cStringBuffer\u533a\u522b，\u4e3e\u4e2a\u4f7f\u7528\u573a\u666f\u7684\u4f8b\u5b50<\/h4>\n
StringBuilder\u548cStringBuffer\u7684\u533a\u522b\u4e3b\u8981\u662f\u5728\u00a0\u7ebf\u7a0b\u5b89\u5168\u6027\u00a0\u548c\u00a0\u6027\u80fd\u00a0\u4e0a：<\/p>\n
- \n
- \n
**\u7ebf\u7a0b\u5b89\u5168\u6027：StringBuffer\u00a0\u6240\u6709\u65b9\u6cd5\u90fd\u88ab\u00a0synchronized\u00a0\u4fee\u9970，\u662f\u7ebf\u7a0b\u5b89\u5168\u7684，\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u4f7f\u7528\u4e0d\u4f1a\u51fa\u73b0\u6570\u636e\u4e0d\u4e00\u81f4\u95ee\u9898\u3002\u800cStringBuilder\u00a0\u6ca1\u6709\u540c\u6b65\u9501，\u7ebf\u7a0b\u4e0d\u5b89\u5168，\u4f46\u6027\u80fd\u66f4\u597d（\u7701\u53bb\u4e86\u9501\u7ade\u4e89\u7684\u5f00\u9500）\u3002<\/p>\n<\/li>\n
- \n
\u6027\u80fd：\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b，StringBuilder\u00a0\u6027\u80fd\u4f18\u4e8e\u00a0StringBuffer（\u56e0\u4e3a\u907f\u514d\u4e86\u540c\u6b65\u64cd\u4f5c\u7684\u989d\u5916\u6d88\u8017）\u3002<\/p>\n<\/li>\n<\/ul>\n
\u5355\u7ebf\u7a0b\u573a\u666f（\u5982\u666e\u901a\u4e1a\u52a1\u903b\u8f91\u3001\u5b57\u7b26\u4e32\u62fc\u63a5\u5de5\u5177\u7c7b），\u9002\u5408\u7528\u00a0StringBuilder，\u8ffd\u6c42\u66f4\u9ad8\u6027\u80fd：<\/p>\n
\/\/ \u5355\u7ebf\u7a0b\u4e0b\u62fc\u63a5\u65e5\u5fd7\u4fe1\u606f
\npublic\u00a0class\u00a0LogBuilder\u00a0{
\n\u00a0 \u00a0\u00a0public\u00a0static\u00a0String\u00a0buildLog(String level, String message)\u00a0{
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u5355\u7ebf\u7a0b\u73af\u5883，\u7528StringBuilder\u66f4\u9ad8\u6548
\n\u00a0 \u00a0 \u00a0 \u00a0 StringBuilder sb =\u00a0new\u00a0StringBuilder();
\n\u00a0 \u00a0 \u00a0 \u00a0 sb.append("[")
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 .append(level)
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 .append("] ")
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 .append(System.currentTimeMillis())
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 .append(": ")
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 .append(message);
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0sb.toString();
\n\u00a0 \u00a0 }
\n\u00a0 \u00a0\u00a0
\n\u00a0 \u00a0\u00a0public\u00a0static\u00a0void\u00a0main(String[] args)\u00a0{
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u5355\u7ebf\u7a0b\u8c03\u7528，\u65e0\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898
\n\u00a0 \u00a0 \u00a0 \u00a0 String log = buildLog("INFO",\u00a0"\u7cfb\u7edf\u542f\u52a8\u5b8c\u6210");
\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(log);\u00a0\/\/ [INFO] 1620000000000: \u7cfb\u7edf\u542f\u52a8\u5b8c\u6210
\n\u00a0 \u00a0 }
\n}<\/p>\n\u591a\u7ebf\u7a0b\u573a\u666f（\u5982\u591a\u7ebf\u7a0b\u5171\u4eab\u7684\u5b57\u7b26\u4e32\u7f13\u51b2\u533a），\u9002\u5408\u7528\u00a0StringBuffer，\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168：<\/p>\n
\/\/ \u591a\u7ebf\u7a0b\u5171\u4eab\u7684\u5b57\u7b26\u4e32\u7d2f\u52a0\u5668
\npublic\u00a0class\u00a0SharedStringAccumulator\u00a0{
\n\u00a0 \u00a0\u00a0\/\/ \u591a\u7ebf\u7a0b\u5171\u4eab\u8d44\u6e90，\u7528StringBuffer\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168
\n\u00a0 \u00a0\u00a0private\u00a0StringBuffer buffer =\u00a0new\u00a0StringBuffer();
\n\u00a0 \u00a0\u00a0
\n\u00a0 \u00a0\u00a0\/\/ \u591a\u7ebf\u7a0b\u53ef\u80fd\u540c\u65f6\u8c03\u7528\u7684\u65b9\u6cd5
\n\u00a0 \u00a0\u00a0public\u00a0void\u00a0append(String content)\u00a0{
\n\u00a0 \u00a0 \u00a0 \u00a0 buffer.append(content).append("\\\\n");
\n\u00a0 \u00a0 }
\n\u00a0 \u00a0\u00a0
\n\u00a0 \u00a0\u00a0public\u00a0String\u00a0getResult()\u00a0{
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a0buffer.toString();
\n\u00a0 \u00a0 }
\n\u00a0 \u00a0\u00a0
\n\u00a0 \u00a0\u00a0public\u00a0static\u00a0void\u00a0main(String[] args)\u00a0throws\u00a0InterruptedException\u00a0{
\n\u00a0 \u00a0 \u00a0 \u00a0 SharedStringAccumulator accumulator =\u00a0new\u00a0SharedStringAccumulator();
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u542f\u52a8\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8ffd\u52a0\u5185\u5bb9
\n\u00a0 \u00a0 \u00a0 \u00a0 Thread t1 =\u00a0new\u00a0Thread(() -> accumulator.append("\u7ebf\u7a0b1\u7684\u6570\u636e"));
\n\u00a0 \u00a0 \u00a0 \u00a0 Thread t2 =\u00a0new\u00a0Thread(() -> accumulator.append("\u7ebf\u7a0b2\u7684\u6570\u636e"));
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0
\n\u00a0 \u00a0 \u00a0 \u00a0 t1.start();
\n\u00a0 \u00a0 \u00a0 \u00a0 t2.start();
\n\u00a0 \u00a0 \u00a0 \u00a0 t1.join();
\n\u00a0 \u00a0 \u00a0 \u00a0 t2.join();
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0
\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(accumulator.getResult());\u00a0
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u8f93\u51fa（\u987a\u5e8f\u53ef\u80fd\u4e0d\u540c，\u4f46\u5185\u5bb9\u5b8c\u6574\u65e0\u9519\u4e71）：
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u7ebf\u7a0b1\u7684\u6570\u636e
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u7ebf\u7a0b2\u7684\u6570\u636e
\n\u00a0 \u00a0 }
\n}<\/p>\n7. jvm\u5185\u5b58\u533a\u57df\u6709\u54ea\u51e0\u5757，\u5b58\u653e\u4ec0\u4e48\u4e1c\u897f？<\/h4>\n
\u6839\u636e JDK 8 \u89c4\u8303，JVM \u8fd0\u884c\u65f6\u5185\u5b58\u5171\u5206\u4e3a\u865a\u62df\u673a\u6808\u3001\u5806\u3001\u5143\u7a7a\u95f4\u3001\u7a0b\u5e8f\u8ba1\u6570\u5668\u3001\u672c\u5730\u65b9\u6cd5\u6808\u4e94\u4e2a\u90e8\u5206\u3002\u8fd8\u6709\u4e00\u90e8\u5206\u5185\u5b58\u53eb\u76f4\u63a5\u5185\u5b58，\u5c5e\u4e8e\u64cd\u4f5c\u7cfb\u7edf\u7684\u672c\u5730\u5185\u5b58，\u4e5f\u662f\u53ef\u4ee5\u76f4\u63a5\u64cd\u4f5c\u7684\u3002<\/p>\n<\/p>\n
![\"\u56fe\u7247\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815100953-689f0771527fa.jpg\")
<\/p>\nJVM\u7684\u5185\u5b58\u7ed3\u6784\u4e3b\u8981\u5206\u4e3a\u4ee5\u4e0b\u51e0\u4e2a\u90e8\u5206：<\/p>\n
- \n
- \n
\u7a0b\u5e8f\u8ba1\u6570\u5668：\u53ef\u4ee5\u770b\u4f5c\u662f\u5f53\u524d\u7ebf\u7a0b\u6240\u6267\u884c\u7684\u5b57\u8282\u7801\u7684\u884c\u53f7\u6307\u793a\u5668，\u7528\u4e8e\u5b58\u50a8\u5f53\u524d\u7ebf\u7a0b\u6b63\u5728\u6267\u884c\u7684 Java \u65b9\u6cd5\u7684 JVM \u6307\u4ee4\u5730\u5740\u3002\u5982\u679c\u7ebf\u7a0b\u6267\u884c\u7684\u662f Native \u65b9\u6cd5，\u8ba1\u6570\u5668\u503c\u4e3a null\u3002\u662f\u552f\u4e00\u4e00\u4e2a\u5728 Java \u865a\u62df\u673a\u89c4\u8303\u4e2d\u6ca1\u6709\u89c4\u5b9a\u4efb\u4f55 OutOfMemoryError \u60c5\u51b5\u7684\u533a\u57df，\u751f\u547d\u5468\u671f\u4e0e\u7ebf\u7a0b\u76f8\u540c\u3002<\/p>\n<\/li>\n
- \n
Java \u865a\u62df\u673a\u6808：\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u81ea\u5df1\u72ec\u7acb\u7684 Java \u865a\u62df\u673a\u6808，\u751f\u547d\u5468\u671f\u4e0e\u7ebf\u7a0b\u76f8\u540c\u3002\u6bcf\u4e2a\u65b9\u6cd5\u5728\u6267\u884c\u65f6\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u6808\u5e27，\u7528\u4e8e\u5b58\u50a8\u5c40\u90e8\u53d8\u91cf\u8868\u3001\u64cd\u4f5c\u6570\u6808\u3001\u52a8\u6001\u94fe\u63a5\u3001\u65b9\u6cd5\u51fa\u53e3\u7b49\u4fe1\u606f\u3002\u53ef\u80fd\u4f1a\u629b\u51fa StackOverflowError \u548c OutOfMemoryError \u5f02\u5e38\u3002<\/p>\n<\/li>\n
- \n
\u672c\u5730\u65b9\u6cd5\u6808：\u4e0e Java \u865a\u62df\u673a\u6808\u7c7b\u4f3c，\u4e3b\u8981\u4e3a\u865a\u62df\u673a\u4f7f\u7528\u5230\u7684 Native \u65b9\u6cd5\u670d\u52a1，\u5728 HotSpot \u865a\u62df\u673a\u4e2d\u548c Java \u865a\u62df\u673a\u6808\u5408\u4e8c\u4e3a\u4e00\u3002\u672c\u5730\u65b9\u6cd5\u6267\u884c\u65f6\u4e5f\u4f1a\u521b\u5efa\u6808\u5e27，\u540c\u6837\u53ef\u80fd\u51fa\u73b0 StackOverflowError \u548c OutOfMemoryError \u4e24\u79cd\u9519\u8bef\u3002<\/p>\n<\/li>\n
- \n
Java \u5806：\u662f JVM \u4e2d\u6700\u5927\u7684\u4e00\u5757\u5185\u5b58\u533a\u57df，\u88ab\u6240\u6709\u7ebf\u7a0b\u5171\u4eab，\u5728\u865a\u62df\u673a\u542f\u52a8\u65f6\u521b\u5efa，\u7528\u4e8e\u5b58\u653e\u5bf9\u8c61\u5b9e\u4f8b\u3002\u4ece\u5185\u5b58\u56de\u6536\u89d2\u5ea6，\u5806\u88ab\u5212\u5206\u4e3a\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3，\u65b0\u751f\u4ee3\u53c8\u5206\u4e3a Eden \u533a\u548c\u4e24\u4e2a Survivor \u533a（From Survivor \u548c To Survivor）\u3002\u5982\u679c\u5728\u5806\u4e2d\u6ca1\u6709\u5185\u5b58\u5b8c\u6210\u5b9e\u4f8b\u5206\u914d，\u5e76\u4e14\u5806\u4e5f\u65e0\u6cd5\u6269\u5c55\u65f6\u4f1a\u629b\u51fa OutOfMemoryError \u5f02\u5e38\u3002<\/p>\n<\/li>\n
- \n
\u65b9\u6cd5\u533a（\u5143\u7a7a\u95f4）：\u5728 JDK 1.8 \u53ca\u4ee5\u540e\u7684\u7248\u672c\u4e2d，\u65b9\u6cd5\u533a\u88ab\u5143\u7a7a\u95f4\u53d6\u4ee3，\u4f7f\u7528\u672c\u5730\u5185\u5b58\u3002\u7528\u4e8e\u5b58\u50a8\u5df2\u88ab\u865a\u62df\u673a\u52a0\u8f7d\u7684\u7c7b\u4fe1\u606f\u3001\u5e38\u91cf\u3001\u9759\u6001\u53d8\u91cf\u7b49\u6570\u636e\u3002\u867d\u7136\u65b9\u6cd5\u533a\u88ab\u63cf\u8ff0\u4e3a\u5806\u7684\u903b\u8f91\u90e8\u5206，\u4f46\u6709 \u201c\u975e\u5806\u201d \u7684\u522b\u540d\u3002\u65b9\u6cd5\u533a\u53ef\u4ee5\u9009\u62e9\u4e0d\u5b9e\u73b0\u5783\u573e\u6536\u96c6，\u5185\u5b58\u4e0d\u8db3\u65f6\u4f1a\u629b\u51fa OutOfMemoryError \u5f02\u5e38\u3002<\/p>\n<\/li>\n
- \n
\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60：\u662f\u65b9\u6cd5\u533a\u7684\u4e00\u90e8\u5206，\u7528\u4e8e\u5b58\u653e\u7f16\u8bd1\u671f\u751f\u6210\u7684\u5404\u79cd\u5b57\u9762\u91cf\u548c\u7b26\u53f7\u5f15\u7528，\u5177\u6709\u52a8\u6001\u6027，\u8fd0\u884c\u65f6\u4e5f\u53ef\u5c06\u65b0\u7684\u5e38\u91cf\u653e\u5165\u6c60\u4e2d\u3002\u5f53\u65e0\u6cd5\u7533\u8bf7\u5230\u8db3\u591f\u5185\u5b58\u65f6，\u4f1a\u629b\u51fa OutOfMemoryError \u5f02\u5e38\u3002<\/p>\n<\/li>\n
- \n
\u76f4\u63a5\u5185\u5b58：\u4e0d\u5c5e\u4e8e JVM \u8fd0\u884c\u65f6\u6570\u636e\u533a\u7684\u4e00\u90e8\u5206，\u901a\u8fc7 NIO \u7c7b\u5f15\u5165，\u662f\u4e00\u79cd\u5806\u5916\u5185\u5b58，\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8 I\/O \u6027\u80fd\u3002\u76f4\u63a5\u5185\u5b58\u7684\u4f7f\u7528\u53d7\u5230\u672c\u673a\u603b\u5185\u5b58\u7684\u9650\u5236，\u82e5\u5206\u914d\u4e0d\u5f53，\u53ef\u80fd\u5bfc\u81f4 OutOfMemoryError \u5f02\u5e38\u3002<\/p>\n<\/li>\n<\/ul>\n
8. \u5783\u573e\u56de\u6536\u7b97\u6cd5\u6709\u54ea\u4e9b？<\/h4>\n
- \n
- \n
\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5：\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u5206\u4e3a\u201c\u6807\u8bb0\u201d\u548c\u201c\u6e05\u9664\u201d\u4e24\u4e2a\u9636\u6bb5，\u9996\u5148\u901a\u8fc7\u53ef\u8fbe\u6027\u5206\u6790，\u6807\u8bb0\u51fa\u6240\u6709\u9700\u8981\u56de\u6536\u7684\u5bf9\u8c61，\u7136\u540e\u7edf\u4e00\u56de\u6536\u6240\u6709\u88ab\u6807\u8bb0\u7684\u5bf9\u8c61\u3002\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u6709\u4e24\u4e2a\u7f3a\u9677，\u4e00\u4e2a\u662f\u6548\u7387\u95ee\u9898，\u6807\u8bb0\u548c\u6e05\u9664\u7684\u8fc7\u7a0b\u6548\u7387\u90fd\u4e0d\u9ad8，\u53e6\u5916\u4e00\u4e2a\u5c31\u662f，\u6e05\u9664\u7ed3\u675f\u540e\u4f1a\u9020\u6210\u5927\u91cf\u7684\u788e\u7247\u7a7a\u95f4\u3002\u6709\u53ef\u80fd\u4f1a\u9020\u6210\u5728\u7533\u8bf7\u5927\u5757\u5185\u5b58\u7684\u65f6\u5019\u56e0\u4e3a\u6ca1\u6709\u8db3\u591f\u7684\u8fde\u7eed\u7a7a\u95f4\u5bfc\u81f4\u518d\u6b21 GC\u3002<\/p>\n<\/li>\n
- \n
\u590d\u5236\u7b97\u6cd5：\u4e3a\u4e86\u89e3\u51b3\u788e\u7247\u7a7a\u95f4\u7684\u95ee\u9898，\u51fa\u73b0\u4e86\u201c\u590d\u5236\u7b97\u6cd5\u201d\u3002\u590d\u5236\u7b97\u6cd5\u7684\u539f\u7406\u662f，\u5c06\u5185\u5b58\u5206\u6210\u4e24\u5757，\u6bcf\u6b21\u7533\u8bf7\u5185\u5b58\u65f6\u90fd\u4f7f\u7528\u5176\u4e2d\u7684\u4e00\u5757，\u5f53\u5185\u5b58\u4e0d\u591f\u65f6，\u5c06\u8fd9\u4e00\u5757\u5185\u5b58\u4e2d\u6240\u6709\u5b58\u6d3b\u7684\u590d\u5236\u5230\u53e6\u4e00\u5757\u4e0a\u3002\u7136\u540e\u5c06\u7136\u540e\u518d\u628a\u5df2\u4f7f\u7528\u7684\u5185\u5b58\u6574\u4e2a\u6e05\u7406\u6389\u3002\u590d\u5236\u7b97\u6cd5\u89e3\u51b3\u4e86\u7a7a\u95f4\u788e\u7247\u7684\u95ee\u9898\u3002\u4f46\u662f\u4e5f\u5e26\u6765\u4e86\u65b0\u7684\u95ee\u9898\u3002\u56e0\u4e3a\u6bcf\u6b21\u5728\u7533\u8bf7\u5185\u5b58\u65f6，\u90fd\u53ea\u80fd\u4f7f\u7528\u4e00\u534a\u7684\u5185\u5b58\u7a7a\u95f4\u3002\u5185\u5b58\u5229\u7528\u7387\u4e25\u91cd\u4e0d\u8db3\u3002<\/p>\n<\/li>\n
- \n
\u6807\u8bb0-\u6574\u7406\u7b97\u6cd5：\u590d\u5236\u7b97\u6cd5\u5728 GC \u4e4b\u540e\u5b58\u6d3b\u5bf9\u8c61\u8f83\u5c11\u7684\u60c5\u51b5\u4e0b\u6548\u7387\u6bd4\u8f83\u9ad8，\u4f46\u5982\u679c\u5b58\u6d3b\u5bf9\u8c61\u6bd4\u8f83\u591a\u65f6，\u4f1a\u6267\u884c\u8f83\u591a\u7684\u590d\u5236\u64cd\u4f5c，\u6548\u7387\u5c31\u4f1a\u4e0b\u964d\u3002\u800c\u8001\u5e74\u4ee3\u7684\u5bf9\u8c61\u5728 GC \u4e4b\u540e\u7684\u5b58\u6d3b\u7387\u5c31\u6bd4\u8f83\u9ad8，\u6240\u4ee5\u5c31\u6709\u4eba\u63d0\u51fa\u4e86\u201c\u6807\u8bb0-\u6574\u7406\u7b97\u6cd5\u201d\u3002\u6807\u8bb0-\u6574\u7406\u7b97\u6cd5\u7684\u201c\u6807\u8bb0\u201d\u8fc7\u7a0b\u4e0e\u201c\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u201d\u7684\u6807\u8bb0\u8fc7\u7a0b\u4e00\u81f4，\u4f46\u6807\u8bb0\u4e4b\u540e\u4e0d\u4f1a\u76f4\u63a5\u6e05\u7406\u3002\u800c\u662f\u5c06\u6240\u6709\u5b58\u6d3b\u5bf9\u8c61\u90fd\u79fb\u52a8\u5230\u5185\u5b58\u7684\u4e00\u7aef\u3002\u79fb\u52a8\u7ed3\u675f\u540e\u76f4\u63a5\u6e05\u7406\u6389\u5269\u4f59\u90e8\u5206\u3002<\/p>\n<\/li>\n
- \n
\u5206\u4ee3\u56de\u6536\u7b97\u6cd5：\u5206\u4ee3\u6536\u96c6\u662f\u5c06\u5185\u5b58\u5212\u5206\u6210\u4e86\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\u3002\u5206\u914d\u7684\u4f9d\u636e\u662f\u5bf9\u8c61\u7684\u751f\u5b58\u5468\u671f，\u6216\u8005\u8bf4\u7ecf\u5386\u8fc7\u7684 GC \u6b21\u6570\u3002\u5bf9\u8c61\u521b\u5efa\u65f6，\u4e00\u822c\u5728\u65b0\u751f\u4ee3\u7533\u8bf7\u5185\u5b58，\u5f53\u7ecf\u5386\u4e00\u6b21 GC \u4e4b\u540e\u5982\u679c\u5bf9\u8fd8\u5b58\u6d3b，\u90a3\u4e48\u5bf9\u8c61\u7684\u5e74\u9f84 +1\u3002\u5f53\u5e74\u9f84\u8d85\u8fc7\u4e00\u5b9a\u503c(\u9ed8\u8ba4\u662f 15，\u53ef\u4ee5\u901a\u8fc7\u53c2\u6570 -XX:MaxTenuringThreshold \u6765\u8bbe\u5b9a)\u540e，\u5982\u679c\u5bf9\u8c61\u8fd8\u5b58\u6d3b，\u90a3\u4e48\u8be5\u5bf9\u8c61\u4f1a\u8fdb\u5165\u8001\u5e74\u4ee3\u3002<\/p>\n<\/li>\n<\/ul>\n
9. Eden\u533a\u548cSurvivor\u533a\u7684\u533a\u522b\u662f\u4ec0\u4e48？<\/h4>\n
Eden \u533a\u548c Survivor \u533a\u662f JVM \u5806\u5185\u5b58\u4e2d\u5e74\u8f7b\u4ee3\u7684\u4e24\u4e2a\u533a\u57df，\u5b83\u4eec\u7684\u533a\u522b\u5982\u4e0b：<\/p>\n
- \n
- \n
\u5bf9\u8c61\u5206\u914d\u60c5\u51b5：\u51e0\u4e4e\u6240\u6709\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\u90fd\u4f1a\u9996\u5148\u5206\u914d\u5728 Eden \u533a，\u5b83\u662f\u5bf9\u8c61\u521d\u59cb\u5206\u914d\u7684\u4e3b\u8981\u533a\u57df\u3002Survivor \u533a\u7528\u4e8e\u5b58\u653e\u4ece Eden \u533a\u7ecf\u8fc7\u5783\u573e\u56de\u6536\u540e\u5b58\u6d3b\u4e0b\u6765\u7684\u5bf9\u8c61，\u800c\u4e0d\u662f\u76f4\u63a5\u5206\u914d\u65b0\u5bf9\u8c61\u3002<\/p>\n<\/li>\n
- \n
\u5783\u573e\u56de\u6536\u89e6\u53d1\u6761\u4ef6：\u5f53 Eden \u533a\u88ab\u5bf9\u8c61\u586b\u6ee1\u65f6，\u4f1a\u89e6\u53d1\u4e00\u6b21 Minor GC，\u5bf9 Eden \u533a\u8fdb\u884c\u5783\u573e\u56de\u6536，\u6e05\u7406\u6389\u4e0d\u518d\u4f7f\u7528\u7684\u5bf9\u8c61\u3002Survivor \u533a\u6ee1\u4e86\u4e0d\u4f1a\u76f4\u63a5\u5f15\u53d1 GC，\u800c\u662f\u5728\u6bcf\u6b21 Minor GC \u65f6，\u4f1a\u5bf9 Survivor \u533a\u8fdb\u884c\u5904\u7406，\u5c06\u5b58\u6d3b\u7684\u5bf9\u8c61\u590d\u5236\u5230\u53e6\u4e00\u4e2a Survivor \u533a\u6216\u8001\u5e74\u4ee3\u3002<\/p>\n<\/li>\n
- \n
\u5185\u5b58\u7ba1\u7406\u65b9\u5f0f：Eden \u533a\u4e3b\u8981\u91c7\u7528\u590d\u5236\u7b97\u6cd5\u8fdb\u884c\u5783\u573e\u56de\u6536，\u5c06\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u5230 Survivor \u533a，\u7136\u540e\u6e05\u7a7a Eden \u533a\u3002Survivor \u533a\u7684\u4e24\u4e2a\u90e8\u5206（From \u548c To）\u5728\u6bcf\u6b21 Minor GC \u540e\u4f1a\u4e92\u6362\u89d2\u8272，\u5b58\u6d3b\u5bf9\u8c61\u4ece\u5f53\u524d\u7684 From Survivor \u533a\u590d\u5236\u5230 To Survivor \u533a，\u7136\u540e\u6e05\u7a7a\u539f\u6765\u7684 From Survivor \u533a，\u4ee5\u6b64\u6765\u4fdd\u8bc1\u5185\u5b58\u7684\u8fde\u7eed\u6027，\u907f\u514d\u5185\u5b58\u788e\u7247\u3002<\/p>\n<\/li>\n<\/ul>\n
10. \u7ebf\u7a0b\u7684\u521b\u5efa\u65b9\u5f0f\u6709\u51e0\u79cd？<\/h4>\n
\u7ee7\u627fThread\u7c7b<\/p>\n
\u8fd9\u662f\u6700\u76f4\u63a5\u7684\u4e00\u79cd\u65b9\u5f0f，\u7528\u6237\u81ea\u5b9a\u4e49\u7c7b\u7ee7\u627fjava.lang.Thread\u7c7b，\u91cd\u5199\u5176run()\u65b9\u6cd5，run()\u65b9\u6cd5\u4e2d\u5b9a\u4e49\u4e86\u7ebf\u7a0b\u6267\u884c\u7684\u5177\u4f53\u4efb\u52a1\u3002\u521b\u5efa\u8be5\u7c7b\u7684\u5b9e\u4f8b\u540e，\u901a\u8fc7\u8c03\u7528start()\u65b9\u6cd5\u542f\u52a8\u7ebf\u7a0b\u3002<\/p>\n
class\u00a0MyThread\u00a0extends\u00a0Thread\u00a0{
\n\u00a0 \u00a0\u00a0@Override
\n\u00a0 \u00a0\u00a0public\u00a0void\u00a0run()\u00a0{
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u7ebf\u7a0b\u6267\u884c\u7684\u4ee3\u7801
\n\u00a0 \u00a0 }
\n}<\/p>\npublic\u00a0static\u00a0void\u00a0main(String[] args)\u00a0{
\n\u00a0 \u00a0 MyThread t =\u00a0new\u00a0MyThread();
\n\u00a0 \u00a0 t.start();
\n}<\/p>\n\u91c7\u7528\u7ee7\u627fThread\u7c7b\u65b9\u5f0f<\/p>\n
- \n
- \n
\u4f18\u70b9: \u7f16\u5199\u7b80\u5355，\u5982\u679c\u9700\u8981\u8bbf\u95ee\u5f53\u524d\u7ebf\u7a0b，\u65e0\u9700\u4f7f\u7528Thread.currentThread ()\u65b9\u6cd5，\u76f4\u63a5\u4f7f\u7528this，\u5373\u53ef\u83b7\u5f97\u5f53\u524d\u7ebf\u7a0b<\/p>\n<\/li>\n
- \n
\u7f3a\u70b9:\u56e0\u4e3a\u7ebf\u7a0b\u7c7b\u5df2\u7ecf\u7ee7\u627f\u4e86Thread\u7c7b，\u6240\u4ee5\u4e0d\u80fd\u518d\u7ee7\u627f\u5176\u4ed6\u7684\u7236\u7c7b<\/p>\n<\/li>\n<\/ul>\n
\u5b9e\u73b0Runnable\u63a5\u53e3<\/p>\n
\u5982\u679c\u4e00\u4e2a\u7c7b\u5df2\u7ecf\u7ee7\u627f\u4e86\u5176\u4ed6\u7c7b，\u5c31\u4e0d\u80fd\u518d\u7ee7\u627fThread\u7c7b，\u6b64\u65f6\u53ef\u4ee5\u5b9e\u73b0java.lang.Runnable\u63a5\u53e3\u3002\u5b9e\u73b0Runnable\u63a5\u53e3\u9700\u8981\u91cd\u5199run()\u65b9\u6cd5，\u7136\u540e\u5c06\u6b64Runnable\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9Thread\u7c7b\u7684\u6784\u9020\u5668，\u521b\u5efaThread\u5bf9\u8c61\u540e\u8c03\u7528\u5176start()\u65b9\u6cd5\u542f\u52a8\u7ebf\u7a0b\u3002<\/p>\n
class\u00a0MyRunnable\u00a0implements\u00a0Runnable\u00a0{
\n\u00a0 \u00a0\u00a0@Override
\n\u00a0 \u00a0\u00a0public\u00a0void\u00a0run()\u00a0{
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u7ebf\u7a0b\u6267\u884c\u7684\u4ee3\u7801
\n\u00a0 \u00a0 }
\n}<\/p>\npublic\u00a0static\u00a0void\u00a0main(String[] args)\u00a0{
\n\u00a0 \u00a0 Thread t =\u00a0new\u00a0Thread(new\u00a0MyRunnable());
\n\u00a0 \u00a0 t.start();
\n}<\/p>\n\u91c7\u7528\u5b9e\u73b0Runnable\u63a5\u53e3\u65b9\u5f0f：<\/p>\n
- \n
- \n
\u4f18\u70b9：\u7ebf\u7a0b\u7c7b\u53ea\u662f\u5b9e\u73b0\u4e86Runable\u63a5\u53e3，\u8fd8\u53ef\u4ee5\u7ee7\u627f\u5176\u4ed6\u7684\u7c7b\u3002\u5728\u8fd9\u79cd\u65b9\u5f0f\u4e0b，\u53ef\u4ee5\u591a\u4e2a\u7ebf\u7a0b\u5171\u4eab\u540c\u4e00\u4e2a\u76ee\u6807\u5bf9\u8c61，\u6240\u4ee5\u975e\u5e38\u9002\u5408\u591a\u4e2a\u76f8\u540c\u7ebf\u7a0b\u6765\u5904\u7406\u540c\u4e00\u4efd\u8d44\u6e90\u7684\u60c5\u51b5，\u4ece\u800c\u53ef\u4ee5\u5c06CPU\u4ee3\u7801\u548c\u6570\u636e\u5206\u5f00，\u5f62\u6210\u6e05\u6670\u7684\u6a21\u578b，\u8f83\u597d\u5730\u4f53\u73b0\u4e86\u9762\u5411\u5bf9\u8c61\u7684\u601d\u60f3\u3002<\/p>\n<\/li>\n
- \n
\u7f3a\u70b9：\u7f16\u7a0b\u7a0d\u5fae\u590d\u6742，\u5982\u679c\u9700\u8981\u8bbf\u95ee\u5f53\u524d\u7ebf\u7a0b，\u5fc5\u987b\u4f7f\u7528Thread.currentThread()\u65b9\u6cd5\u3002<\/p>\n<\/li>\n<\/ul>\n
- \n
\u5b9e\u73b0Callable\u63a5\u53e3\u4e0eFutureTask<\/p>\n<\/li>\n
java.util.concurrent.Callable\u63a5\u53e3\u7c7b\u4f3c\u4e8eRunnable，\u4f46Callable\u7684call()\u65b9\u6cd5\u53ef\u4ee5\u6709\u8fd4\u56de\u503c\u5e76\u4e14\u53ef\u4ee5\u629b\u51fa\u5f02\u5e38\u3002\u8981\u6267\u884cCallable\u4efb\u52a1，\u9700\u5c06\u5b83\u5305\u88c5\u8fdb\u4e00\u4e2aFutureTask，\u56e0\u4e3aThread\u7c7b\u7684\u6784\u9020\u5668\u53ea\u63a5\u53d7Runnable\u53c2\u6570，\u800cFutureTask\u5b9e\u73b0\u4e86Runnable\u63a5\u53e3\u3002<\/p>\n
class\u00a0MyCallable\u00a0implements\u00a0Callable<Integer>\u00a0{
\n\u00a0 \u00a0\u00a0@Override
\n\u00a0 \u00a0\u00a0public\u00a0Integer\u00a0call()\u00a0throws\u00a0Exception\u00a0{
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u7ebf\u7a0b\u6267\u884c\u7684\u4ee3\u7801，\u8fd9\u91cc\u8fd4\u56de\u4e00\u4e2a\u6574\u578b\u7ed3\u679c
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0return\u00a01;
\n\u00a0 \u00a0 }
\n}<\/p>\npublic\u00a0static\u00a0void\u00a0main(String[] args)\u00a0{
\n\u00a0 \u00a0 MyCallable task =\u00a0new\u00a0MyCallable();
\n\u00a0 \u00a0 FutureTask<Integer> futureTask =\u00a0new\u00a0FutureTask<>(task);
\n\u00a0 \u00a0 Thread t =\u00a0new\u00a0Thread(futureTask);
\n\u00a0 \u00a0 t.start();<\/p>\n\u00a0 \u00a0\u00a0try\u00a0{
\n\u00a0 \u00a0 \u00a0 \u00a0 Integer result = futureTask.get(); \u00a0\/\/ \u83b7\u53d6\u7ebf\u7a0b\u6267\u884c\u7ed3\u679c
\n\u00a0 \u00a0 \u00a0 \u00a0 System.out.println("Result: "\u00a0+ result);
\n\u00a0 \u00a0 }\u00a0catch\u00a0(InterruptedException | ExecutionException e) {
\n\u00a0 \u00a0 \u00a0 \u00a0 e.printStackTrace();
\n\u00a0 \u00a0 }
\n}<\/p>\n\u91c7\u7528\u5b9e\u73b0Callable\u63a5\u53e3\u65b9\u5f0f：<\/p>\n
- \n
- \n
\u7f3a\u70b9：\u7f16\u7a0b\u7a0d\u5fae\u590d\u6742，\u5982\u679c\u9700\u8981\u8bbf\u95ee\u5f53\u524d\u7ebf\u7a0b，\u5fc5\u987b\u8c03\u7528Thread.currentThread()\u65b9\u6cd5\u3002<\/p>\n<\/li>\n
- \n
\u4f18\u70b9：\u7ebf\u7a0b\u53ea\u662f\u5b9e\u73b0Runnable\u6216\u5b9e\u73b0Callable\u63a5\u53e3，\u8fd8\u53ef\u4ee5\u7ee7\u627f\u5176\u4ed6\u7c7b\u3002\u8fd9\u79cd\u65b9\u5f0f\u4e0b，\u591a\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u5171\u4eab\u4e00\u4e2atarget\u5bf9\u8c61，\u975e\u5e38\u9002\u5408\u591a\u7ebf\u7a0b\u5904\u7406\u540c\u4e00\u4efd\u8d44\u6e90\u7684\u60c5\u5f62\u3002<\/p>\n<\/li>\n<\/ul>\n
\u4f7f\u7528\u7ebf\u7a0b\u6c60（Executor\u6846\u67b6）<\/p>\n
\u4eceJava 5\u5f00\u59cb\u5f15\u5165\u7684java.util.concurrent.ExecutorService\u548c\u76f8\u5173\u7c7b\u63d0\u4f9b\u4e86\u7ebf\u7a0b\u6c60\u7684\u652f\u6301，\u8fd9\u662f\u4e00\u79cd\u66f4\u9ad8\u6548\u7684\u7ebf\u7a0b\u7ba1\u7406\u65b9\u5f0f，\u907f\u514d\u4e86\u9891\u7e41\u521b\u5efa\u548c\u9500\u6bc1\u7ebf\u7a0b\u7684\u5f00\u9500\u3002\u53ef\u4ee5\u901a\u8fc7Executors\u7c7b\u7684\u9759\u6001\u65b9\u6cd5\u521b\u5efa\u4e0d\u540c\u7c7b\u578b\u7684\u7ebf\u7a0b\u6c60\u3002<\/p>\n
class\u00a0Task\u00a0implements\u00a0Runnable\u00a0{
\n\u00a0 \u00a0\u00a0@Override
\n\u00a0 \u00a0\u00a0public\u00a0void\u00a0run()\u00a0{
\n\u00a0 \u00a0 \u00a0 \u00a0\u00a0\/\/ \u7ebf\u7a0b\u6267\u884c\u7684\u4ee3\u7801
\n\u00a0 \u00a0 }
\n}<\/p>\npublic\u00a0static\u00a0void\u00a0main(String[] args)\u00a0{
\n\u00a0 \u00a0 ExecutorService executor = Executors.newFixedThreadPool(10); \u00a0\/\/ \u521b\u5efa\u56fa\u5b9a\u5927\u5c0f\u7684\u7ebf\u7a0b\u6c60
\n\u00a0 \u00a0\u00a0for\u00a0(int\u00a0i =\u00a00; i <\u00a0100; i++) {
\n\u00a0 \u00a0 \u00a0 \u00a0 executor.submit(new\u00a0Task()); \u00a0\/\/ \u63d0\u4ea4\u4efb\u52a1\u5230\u7ebf\u7a0b\u6c60\u6267\u884c
\n\u00a0 \u00a0 }
\n\u00a0 \u00a0 executor.shutdown(); \u00a0\/\/ \u5173\u95ed\u7ebf\u7a0b\u6c60
\n}<\/p>\n\u91c7\u7528\u7ebf\u7a0b\u6c60\u65b9\u5f0f：<\/p>\n
- \n
- \n
\u7f3a\u70b9：\u7a0b\u6c60\u589e\u52a0\u4e86\u7a0b\u5e8f\u7684\u590d\u6742\u5ea6，\u7279\u522b\u662f\u5f53\u6d89\u53ca\u7ebf\u7a0b\u6c60\u53c2\u6570\u8c03\u6574\u548c\u6545\u969c\u6392\u67e5\u65f6\u3002\u9519\u8bef\u7684\u914d\u7f6e\u53ef\u80fd\u5bfc\u81f4\u6b7b\u9501\u3001\u8d44\u6e90\u8017\u5c3d\u7b49\u95ee\u9898，\u8fd9\u4e9b\u95ee\u9898\u7684\u8bca\u65ad\u548c\u4fee\u590d\u53ef\u80fd\u8f83\u4e3a\u590d\u6742\u3002<\/p>\n<\/li>\n
- \n
\u4f18\u70b9：\u7ebf\u7a0b\u6c60\u53ef\u4ee5\u91cd\u7528\u9884\u5148\u521b\u5efa\u7684\u7ebf\u7a0b，\u907f\u514d\u4e86\u7ebf\u7a0b\u521b\u5efa\u548c\u9500\u6bc1\u7684\u5f00\u9500，\u663e\u8457\u63d0\u9ad8\u4e86\u7a0b\u5e8f\u7684\u6027\u80fd\u3002\u5bf9\u4e8e\u9700\u8981\u5feb\u901f\u54cd\u5e94\u7684\u5e76\u53d1\u8bf7\u6c42，\u7ebf\u7a0b\u6c60\u53ef\u4ee5\u8fc5\u901f\u63d0\u4f9b\u7ebf\u7a0b\u6765\u5904\u7406\u4efb\u52a1，\u51cf\u5c11\u7b49\u5f85\u65f6\u95f4\u3002\u5e76\u4e14，\u7ebf\u7a0b\u6c60\u80fd\u591f\u6709\u6548\u63a7\u5236\u8fd0\u884c\u7684\u7ebf\u7a0b\u6570\u91cf，\u9632\u6b62\u56e0\u521b\u5efa\u8fc7\u591a\u7ebf\u7a0b\u5bfc\u81f4\u7684\u7cfb\u7edf\u8d44\u6e90\u8017\u5c3d（\u5982\u5185\u5b58\u6ea2\u51fa）\u3002\u901a\u8fc7\u5408\u7406\u914d\u7f6e\u7ebf\u7a0b\u6c60\u5927\u5c0f，\u53ef\u4ee5\u6700\u5927\u5316CPU\u5229\u7528\u7387\u548c\u7cfb\u7edf\u541e\u5410\u91cf\u3002<\/p>\n<\/li>\n<\/ul>\n
11. \u7ebf\u7a0b\u6c60\u7684\u53c2\u6570\u6709\u54ea\u4e9b？<\/h4>\n
\u7ebf\u7a0b\u6c60\u7684\u6784\u9020\u51fd\u6570\u67097\u4e2a\u53c2\u6570：<\/p>\n<\/p>\n
![\"\u56fe\u7247\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815100953-689f0771ca109.jpg\")
<\/p>\n- \n
- \n
corePoolSize：\u7ebf\u7a0b\u6c60\u6838\u5fc3\u7ebf\u7a0b\u6570\u91cf\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b，\u7ebf\u7a0b\u6c60\u4e2d\u7ebf\u7a0b\u7684\u6570\u91cf\u5982\u679c <= corePoolSize，\u90a3\u4e48\u5373\u4f7f\u8fd9\u4e9b\u7ebf\u7a0b\u5904\u4e8e\u7a7a\u95f2\u72b6\u6001，\u90a3\u4e5f\u4e0d\u4f1a\u88ab\u9500\u6bc1\u3002<\/p>\n<\/li>\n
- \n
maximumPoolSize：\u9650\u5236\u4e86\u7ebf\u7a0b\u6c60\u80fd\u521b\u5efa\u7684\u6700\u5927\u7ebf\u7a0b\u603b\u6570（\u5305\u62ec\u6838\u5fc3\u7ebf\u7a0b\u548c\u975e\u6838\u5fc3\u7ebf\u7a0b），\u5f53\u00a0corePoolSize\u00a0\u5df2\u6ee1 \u5e76\u4e14 \u5c1d\u8bd5\u5c06\u65b0\u4efb\u52a1\u52a0\u5165\u963b\u585e\u961f\u5217\u5931\u8d25（\u5373\u961f\u5217\u5df2\u6ee1）\u5e76\u4e14 \u5f53\u524d\u7ebf\u7a0b\u6570 <\u00a0maximumPoolSize，\u5c31\u4f1a\u521b\u5efa\u65b0\u7ebf\u7a0b\u6267\u884c\u6b64\u4efb\u52a1，\u4f46\u662f\u5f53\u00a0corePoolSize\u00a0\u6ee1 \u5e76\u4e14 \u961f\u5217\u6ee1 \u5e76\u4e14 \u7ebf\u7a0b\u6570\u5df2\u8fbe\u00a0maximumPoolSize\u00a0\u5e76\u4e14 \u53c8\u6709\u65b0\u4efb\u52a1\u63d0\u4ea4\u65f6，\u5c31\u4f1a\u89e6\u53d1\u62d2\u7edd\u7b56\u7565\u3002<\/p>\n<\/li>\n
- \n
keepAliveTime：\u5f53\u7ebf\u7a0b\u6c60\u4e2d\u7ebf\u7a0b\u7684\u6570\u91cf\u5927\u4e8ecorePoolSize，\u5e76\u4e14\u67d0\u4e2a\u7ebf\u7a0b\u7684\u7a7a\u95f2\u65f6\u95f4\u8d85\u8fc7\u4e86keepAliveTime，\u90a3\u4e48\u8fd9\u4e2a\u7ebf\u7a0b\u5c31\u4f1a\u88ab\u9500\u6bc1\u3002<\/p>\n<\/li>\n
- \n
unit：\u5c31\u662fkeepAliveTime\u65f6\u95f4\u7684\u5355\u4f4d\u3002<\/p>\n<\/li>\n
- \n
workQueue：\u5de5\u4f5c\u961f\u5217\u3002\u5f53\u6ca1\u6709\u7a7a\u95f2\u7684\u7ebf\u7a0b\u6267\u884c\u65b0\u4efb\u52a1\u65f6，\u8be5\u4efb\u52a1\u5c31\u4f1a\u88ab\u653e\u5165\u5de5\u4f5c\u961f\u5217\u4e2d，\u7b49\u5f85\u6267\u884c\u3002<\/p>\n<\/li>\n
- \n
threadFactory：\u7ebf\u7a0b\u5de5\u5382\u3002\u53ef\u4ee5\u7528\u6765\u7ed9\u7ebf\u7a0b\u53d6\u540d\u5b57\u7b49\u7b49<\/p>\n<\/li>\n
- \n
handler：\u62d2\u7edd\u7b56\u7565\u3002\u5f53\u4e00\u4e2a\u65b0\u4efb\u52a1\u4ea4\u7ed9\u7ebf\u7a0b\u6c60，\u5982\u679c\u6b64\u65f6\u7ebf\u7a0b\u6c60\u4e2d\u6709\u7a7a\u95f2\u7684\u7ebf\u7a0b，\u5c31\u4f1a\u76f4\u63a5\u6267\u884c，\u5982\u679c\u6ca1\u6709\u7a7a\u95f2\u7684\u7ebf\u7a0b，\u5c31\u4f1a\u5c06\u8be5\u4efb\u52a1\u52a0\u5165\u5230\u963b\u585e\u961f\u5217\u4e2d，\u5982\u679c\u963b\u585e\u961f\u5217\u6ee1\u4e86，\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7ebf\u7a0b，\u4ece\u963b\u585e\u961f\u5217\u5934\u90e8\u53d6\u51fa\u4e00\u4e2a\u4efb\u52a1\u6765\u6267\u884c，\u5e76\u5c06\u65b0\u4efb\u52a1\u52a0\u5165\u5230\u963b\u585e\u961f\u5217\u672b\u5c3e\u3002\u5982\u679c\u5f53\u524d\u7ebf\u7a0b\u6c60\u4e2d\u7ebf\u7a0b\u7684\u6570\u91cf\u7b49\u4e8emaximumPoolSize，\u5c31\u4e0d\u4f1a\u521b\u5efa\u65b0\u7ebf\u7a0b，\u5c31\u4f1a\u53bb\u6267\u884c\u62d2\u7edd\u7b56\u7565\u3002<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb325\u6b21\uff0c\u70b9\u8d5e8\u6b21\uff0c\u6536\u85cf8\u6b21\u3002Java\u96c6\u5408\u6846\u67b6\u4e0e\u591a\u7ebf\u7a0b\u6838\u5fc3\u77e5\u8bc6\u70b9\u6458\u8981\uff1a ArrayList\u548cLinkedList\u533a\u522b\uff1aArrayList\u57fa\u4e8e\u6570\u7ec4\u5b9e\u73b0\uff0c\u968f\u673a\u8bbf\u95ee\u5feb\uff1bLinkedList\u57fa\u4e8e\u94fe\u8868\uff0c\u63d2\u5165\u5220\u9664\u9ad8\u6548\u3002 HashMap\u51b2\u7a81\u89e3\u51b3\u65b9\u6848\uff1aJDK1.7\u4f7f\u7528\u94fe\u8868\uff0c1.8\u5f15\u5165\u7ea2\u9ed1\u6811\u4f18\u5316\u6027\u80fd\u3002\u6269\u5bb9\u673a\u5236\u91c7\u75282\u6b21\u5e42\u6269\u5c55\uff0c\u907f\u514d\u91cd\u65b0\u8ba1\u7b97hash\u3002 ConcurrentHashMap\u7ebf\u7a0b\u5b89\u5168\u5b9e\u73b0\uff1aJDK1.7\u4f7f\u7528\u5206\u6bb5\u9501\uff0c1.8\u6539\u4e3aCAS+synchronized\uff0c\u63d0\u9ad8\u5e76\u53d1\u6027\u80fd\u3002 \u5b57\u7b26\u4e32\u521b\u5efa\uff1anew String("ab")\u53ef\u80fd\u521b\u5efa1-2<\/p>\n","protected":false},"author":2,"featured_media":57706,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,6063,190,925,176],"topic":[],"class_list":["post-57713","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-java","tag-6063","tag-190","tag-925","tag-176"],"yoast_head":"\n
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