{"id":182,"date":"2025-08-29T12:23:51","date_gmt":"2025-08-29T04:23:51","guid":{"rendered":"http:\/\/192.140.166.102\/?p=182"},"modified":"2025-08-29T12:23:52","modified_gmt":"2025-08-29T04:23:52","slug":"%e9%9d%a2%e8%af%95%e5%85%ab%e8%82%a1%e4%b9%8b%e9%9b%86%e5%90%88%e6%a1%86%e6%9e%b6","status":"publish","type":"post","link":"https:\/\/lsuccess.xyz\/index.php\/2025\/08\/29\/%e9%9d%a2%e8%af%95%e5%85%ab%e8%82%a1%e4%b9%8b%e9%9b%86%e5%90%88%e6%a1%86%e6%9e%b6\/","title":{"rendered":"\u9762\u8bd5\u516b\u80a1\u4e4b\u96c6\u5408\u6846\u67b6"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u672c\u6587\u7528\u4e8e\u7edf\u4e00\u6574\u7406JavaSE\u4e2d\u7684\u96c6\u5408\u6846\u67b6\u5e38\u89c1\u516b\u80a1\u95ee\u9898\uff0c\u4f1a\u968f\u7740\u9762\u8bd5\u5185\u5bb9\u8fdb\u884c\u66f4\u65b0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1.\u5e38\u7528\u7684\u96c6\u5408\u6846\u67b6\u6709\u54ea\u4e9b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b64\u5904\u914d\u624b\u753b\u56fe<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u961f\u5217\u548c\u6808\u7684\u533a\u522b\u77e5\u9053\u5417\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u961f\u5217\u662f\u4e00\u79cd\u5148\u8fdb\u5148\u51fa\u7684\u6570\u7ed3\u6784\uff0c\u800c\u6808\u662f\u5148\u8fdb\u540e\u51fa\u7684\u6570\u636e\u7ed3\u6784\uff08\u6570\u636e\u7ed3\u6784\u7ecf\u5178\u9898\u76ee\u4e4b\u6808\u7684\u6700\u5c0f\u5927\u5c0f\u4e3a\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ebf\u7a0b\u5b89\u5168\u7684\u5bb9\u5668\u6709\u54ea\u4e9b\u77e5\u9053\u5417\uff1f<br> Vector\u3001Hashtable\u3001ConcurrentHashMap\u3001CopyOnWriteArrayList\u3001ConcurrentLinkedQueue\u3001ArrayBlockingQueue\u3001LinkedBlockingQueue \u90fd\u662f\u7ebf\u7a0b\u5b89\u5168\u7684<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2.ArrayList \u548c LinkedList \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ed3\u6784\u4e0a\uff1aArrayList \u662f\u57fa\u4e8e\u6570\u7ec4\u5b9e\u73b0\u7684\uff0cLinkedList \u662f\u57fa\u4e8e\u94fe\u8868\u5b9e\u73b0\u7684<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7528\u9014\u4e0a\uff1aArrayList \u66f4\u5229\u4e8e\u67e5\u627e\uff0cLinkedList \u66f4\u5229\u4e8e\u589e\u5220<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u67e5\u627e\u4e0a\uff1a\u7531\u4e8e ArrayList \u662f\u57fa\u4e8e\u6570\u7ec4\u5b9e\u73b0\u7684\uff0c\u6240\u4ee5&nbsp;<code>get(int index)<\/code>&nbsp;\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u6570\u7ec4\u4e0b\u6807\u83b7\u53d6\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u662f O(1)\uff1bLinkedList \u662f\u57fa\u4e8e\u94fe\u8868\u5b9e\u73b0\u7684\uff0c<code>get(int index)<\/code>&nbsp;\u9700\u8981\u904d\u5386\u94fe\u8868\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u662f O(n)\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u7136\uff0c<code>get(E element)<\/code>&nbsp;\u8fd9\u79cd\u67e5\u627e\uff0c\u4e24\u79cd\u96c6\u5408\u90fd\u9700\u8981\u904d\u5386\u901a\u8fc7 equals \u6bd4\u8f83\u83b7\u53d6\u5143\u7d20\uff0c\u6240\u4ee5\u65f6\u95f4\u590d\u6742\u5ea6\u90fd\u662f O(n)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5220\u9664\u4e0a\uff1aArrayList\u5982\u679c\u5220\u9664\u7684\u662f\u5c3e\u90e8\u7684\u6570\u636e\uff0c\u590d\u6742\u5ea6\u5c31\u662fO\uff081\uff09\uff0c\u5982\u679c\u5220\u9664\u4e2d\u95f4\u7684\u90e8\u5206\uff0c\u5c31\u4f1a\u6d89\u53ca\u5230\u590d\u5236\u6570\u7ec4\uff0c\u8fd8\u53ef\u80fd\u89e6\u53d1\u6269\u5bb9\uff0c\u6027\u80fd\u6d88\u8017\u8f83\u5927\u3002LinkedList\u5220\u9664\u5982\u679c\u662f\u5728\u5934\u90e8\u548c\u5c3e\u90e8\u7684\u8bdd\u590d\u6742\u5ea6\u5c31\u662fO\uff081\uff09\uff0c\u5982\u679c\u662f\u5728\u4e2d\u95f4\u7684\u8bdd\u590d\u6742\u5ea6\u5c31\u662fO\uff08n\uff09\uff0c\u56e0\u4e3a\u9700\u8981\u904d\u5386\u627e\u5230\u63d2\u5165\u70b9\uff0c\u4f46\u63d2\u5165\u53ea\u9700\u8981\u6307\u5b9a\u597d\u524d\u9a71\u548c\u540e\u7ee7\u5373\u53ef<br><br>\u968f\u673a\u67e5\u627e\u4e0a\uff1aArrayList \u662f\u57fa\u4e8e\u6570\u7ec4\u7684\uff0c\u4e5f\u5b9e\u73b0\u4e86 RandomAccess \u63a5\u53e3\uff0c\u6240\u4ee5\u5b83\u652f\u6301\u968f\u673a\u8bbf\u95ee\uff0c\u53ef\u4ee5\u901a\u8fc7\u4e0b\u6807\u76f4\u63a5\u83b7\u53d6\u5143\u7d20\u3002LinkedList \u662f\u57fa\u4e8e\u94fe\u8868\u7684\uff0c\u6240\u4ee5\u5b83\u6ca1\u6cd5\u6839\u636e\u4e0b\u6807\u76f4\u63a5\u83b7\u53d6\u5143\u7d20\uff0c\u4e0d\u652f\u6301\u968f\u673a\u8bbf\u95ee\u3002<br><br>\u5360\u7528\u5185\u5b58\u4e0a\uff1aArrayList \u662f\u57fa\u4e8e\u6570\u7ec4\u7684\uff0c\u662f\u4e00\u5757\u8fde\u7eed\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u5982\u679c\u6d89\u53ca\u5230\u6269\u5bb9\uff0c\u5c31\u4f1a\u91cd\u65b0\u5206\u914d\u5185\u5b58\uff0c\u7a7a\u95f4\u662f\u539f\u6765\u7684 1.5 \u500d\u3002LinkedList \u662f\u57fa\u4e8e\u94fe\u8868\u7684\uff0c\u4e0d\u9700\u8981\u8fde\u7eed\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u6bcf\u4e2a\u8282\u70b9\u90fd\u5b58\u50a8\u7740\u6307\u5411\u4e0b\u4e00\u4e2a\u8282\u70b9\u7684\u6307\u9488<br><br>\u4f7f\u7528\u573a\u666f\u4e0a\uff1aArrayList \u9002\u7528\u4e8e\u8bfb\u53d6\u64cd\u4f5c\u8fdc\u591a\u4e8e\u5199\u5165\u64cd\u4f5c\uff0c\u5982\u5b58\u50a8\u4e0d\u7ecf\u5e38\u6539\u53d8\u7684\u5217\u8868\uff0c\u9700\u8981\u9891\u7e41\u5728\u5217\u8868\u672b\u5c3e\u6dfb\u52a0\u5143\u7d20\u7684\u573a\u666f\u3002LinkedList \u9002\u7528\u4e8e\u9891\u7e41\u63d2\u5165\u548c\u5220\u9664\uff0c\u4e0d\u9700\u8981\u5feb\u901f\u968f\u673a\u8bbf\u95ee\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3.ArrayList \u7684\u6269\u5bb9\u673a\u5236\u4e86\u89e3\u5417\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53ArrayList\u6bcf\u6b21\u9700\u8981\u6dfb\u52a0\u65b0\u6570\u636e\u7684\u65f6\u5019\u90fd\u4f1a\u8fdb\u884c\u6269\u5bb9\u68c0\u6d4b\uff0c\u5982\u679c\u5f53\u524d\u5bb9\u91cf+1\u8d85\u8fc7\u6570\u636e\u957f\u5ea6\uff0c\u5c06\u4f1a\u6269\u5bb9\u5230\u539f\u5148\u76841.5\u500d\uff0c\u5e76\u628a\u65e7\u6570\u636e\u4e2d\u7684\u5143\u7d20\u62f7\u8d1d\u5230\u65b0\u6570\u636e\u4e2d\u53bb\uff0c\u8fd9\u6837\u7684\u8fc7\u7a0b\u4f1a\u6709\u6027\u80fd\u635f\u8017\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4.\u5feb\u901f\u5931\u8d25fail-fast\u4e86\u89e3\u5417\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u662f\u4e00\u79cd\u9519\u8bef\u68c0\u6d4b\u673a\u5236\uff0c\u5728\u6211\u4eec\u4f7f\u7528\u8fed\u4ee3\u5668\u5bf9\u96c6\u5408\u5bf9\u8c61\u8fdb\u884c\u904d\u5386\u7684\u65f6\u5019\uff0c\u8fed\u4ee3\u5668\u4f1a\u7ef4\u62a4\u4e00\u4e2amodCount\u7684\u503c\uff0c\u5728\u6bcf\u6b21\u4f7f\u7528hashnext()\/next()\u65f6\u90fd\u4f1a\u68c0\u67e5modCount\u7684\u503c\u662f\u5426\u53d1\u751f\u4e86\u6539\u53d8(\u6709\u4e00\u4e2a\u9884\u671f\u503c)\uff0c\u5982\u679c\u6ca1\u6709\u6539\u53d8\u5c31\u4f1a\u8fd4\u56de\u904d\u5386\u7684\u503c\uff0c\u53d1\u751f\u4e86\u6539\u53d8\u5c31\u4f1a\u629b\u51faConcurrent Modification Exception\u3002\u4e5f\u5c31\u662f\u6211\u4eec\u4e0d\u4f7f\u7528\u8fed\u4ee3\u5668\u8fdb\u884c\u5220\u9664\u65f6\uff0c\u540c\u65f6\u904d\u5386\u96c6\u5408\u65f6\u4f1a\u51fa\u73b0\u7684\u9519\u8bef\u3002\u4f46\u5982\u679cmodCount\u7684\u503c\u53c8\u88ab\u4fee\u6539\u4e3a\u9884\u671f\u503c\u7684\u8bdd\uff0c\u5c31\u4e0d\u4f1a\u629b\u51fa\u5f02\u5e38\uff08\u7c7b\u4f3cCAS\u9501\u7684ABA\u95ee\u9898\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ec0\u4e48\u662f\u5b89\u5168\u5931\u8d25\uff08fail\u2014safe\uff09\u5462\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u91c7\u7528\u5b89\u5168\u5931\u8d25\u673a\u5236\u7684\u96c6\u5408\u5bb9\u5668\uff0c\u5728\u904d\u5386\u65f6\u4e0d\u662f\u76f4\u63a5\u5728\u96c6\u5408\u5185\u5bb9\u4e0a\u8bbf\u95ee\u7684\uff0c\u800c\u662f\u5148\u590d\u5236\u539f\u6709\u96c6\u5408\u5185\u5bb9\uff0c\u5728\u62f7\u8d1d\u7684\u96c6\u5408\u4e0a\u8fdb\u884c\u904d\u5386\u3002\u57fa\u4e8e\u62f7\u8d1d\u5185\u5bb9\u7684\u4f18\u70b9\u662f\u907f\u514d\u4e86 Concurrent Modification Exception\uff0c\u4f46\u540c\u6837\u5730\uff0c\u8fed\u4ee3\u5668\u5e76\u4e0d\u80fd\u8bbf\u95ee\u5230\u4fee\u6539\u540e\u7684\u5185\u5bb9\uff0c\u5373\uff1a\u8fed\u4ee3\u5668\u904d\u5386\u7684\u662f\u5f00\u59cb\u904d\u5386\u90a3\u4e00\u523b\u62ff\u5230\u7684\u96c6\u5408\u62f7\u8d1d\uff0c\u5728\u904d\u5386\u671f\u95f4\u539f\u96c6\u5408\u53d1\u751f\u7684\u4fee\u6539\u8fed\u4ee3\u5668\u662f\u4e0d\u77e5\u9053\u7684<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5.CopyOnWriteArrayList \u4e86\u89e3\u591a\u5c11\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b83\u662f\u7ebf\u7a0b\u5b89\u5168\u7248\u672c\u7684ArrayList,\u652f\u6301\u8bfb\u5199\u5206\u79bb\uff0c\u5728\u5199\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u4f1a\u590d\u5236\u51fa\u4e00\u4e2a\u539f\u5148\u6570\u636e\u7684\u526f\u672c\uff0c\u5199\u64cd\u4f5c\u4f1a\u5728\u526f\u672c\u4e0a\u901a\u8fc7\u52a0\u9501\u6267\u884c\uff08\u4e0d\u7136\u591a\u4e2a\u7ebf\u7a0b\u6267\u884c\u4efb\u52a1\u7684\u8bdd\uff0c\u4f1a\u628a\u4e4b\u524d\u7ebf\u7a0b\u4fee\u6539\u7684\u5185\u5bb9\u8986\u76d6\u6389\uff0c\u5178\u578b\u7684\u6570\u636e\u4e00\u81f4\u6027\u95ee\u9898\uff09\uff0c\u4fee\u6539\u5b8c\u4e4b\u540e\u5c31\u4f1a\u628a\u65e7\u6570\u7ec4\u7684\u5f15\u7528\u6267\u884c\u8fd9\u4e2a\u66f4\u65b0\u597d\u7684\u65b0\u6570\u7ec4\u4e0a\u3002\u800c\u8bfb\u64cd\u4f5c\u4e0d\u4f1a\u52a0\u9501\uff0c\u5728\u8bfb\u5199\u5e76\u53d1\u7684\u65f6\u5019\uff0c\u8bfb\u53d6\u7684\u662f\u65e7\u6570\u7ec4\u4e2d\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">6.\u80fd\u8bf4\u4e00\u4e0b HashMap \u7684\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u5417\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5305\u6d46\u95ee\u9898\uff0c\u5176\u6d89\u53ca\u6570\u636e\uff0c\u94fe\u8868\uff0c\u7ea2\u9ed1\u6811<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap\u901a\u8fc7hash\u8ba1\u7b97\u6765\u8ba1\u7b97\u5e95\u5c42\u6570\u7ec4\u4e2d\u7684\u6876\u4f4d\u7f6e\uff0c\u53d1\u9001\u54c8\u5e0c\u51b2\u7a81\u7684\u65f6\u5019\u4f1a\u6709\u4ee5\u4e0b\u4e24\u79cd\u60c5\u51b5\uff0c\u5982\u679c\u952e\u76f8\u540c\uff08\u8fd8\u6d89\u53caequals\u65b9\u6cd5\uff0c\u6211\u4eec\u5728\u91cd\u5199equals\u65b9\u6cd5\u7684\u65f6\u5019\u4e5f\u8981\u91cd\u5199\u5176hash\u65b9\u6cd5\uff0c\u4e0d\u5982HashMap\u65e0\u6cd5\u6b63\u5e38\u4f7f\u7528\uff09\u5c31\u4f1a\u8986\u76d6\u6389\u539f\u5148\u7684\u503c\uff0c\u5982\u679c\u4e0d\u540c\uff0c\u6839\u636e\u60c5\u51b5\u653e\u5165\u7ea2\u9ed1\u6811\u6216\u8005\u94fe\u8868\u4e2d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53HashMap\u4e2d\u6dfb\u52a0\u7684\u5143\u7d20\u6570\u91cf\u5927\u4e8e\u8d1f\u8f7d\u56e0\u5b50*\u6570\u7ec4\u73b0\u6709\u957f\u5ea6\u7684\u65f6\u5019\uff08\u8d1f\u8f7d\u56e0\u5b50\u9ed8\u8ba40.75\uff0c\u6570\u7ec4\u957f\u5ea6\u4e00\u5f00\u59cb\u9ed8\u8ba4\u4e3a16\uff09\uff0c\u5c31\u4f1a\u53d1\u751f\u6269\u5bb9(\u540e\u9762\u4f1a\u8be6\u7ec6\u63d0\u5230),\u53d1\u751f\u6269\u5bb9\u7684\u8bdd\u4f1a\u91cd\u65b0\u8ba1\u7b97\u54c8\u5e0c\u503c\u5e76\u4e14\u957f\u5ea6\u4e3a\u539f\u5148\u76842\u500d\uff0c\u8fd9\u662f\u4e3a\u4e86\u65b9\u4fbf\u67e5\u627e\u505a\u51fa\u7684\u51b3\u5b9a\u3002\u53ea\u6709\u5f53\u6570\u7ec4\u957f\u5ea6\u5927\u4e8e64\uff0c\u4e14\u94fe\u8868\u957f\u5ea6\u5927\u4e8e8\uff0c\u94fe\u8868\u5c31\u4f1a\u8fdb\u5316\u6210\u4e3a\u7ea2\u9ed1\u6811\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap\u7684key\u548c\u5176KeyValues\u90fd\u53ef\u4ee5\u662fNull\u503c<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7.\u4f60\u5bf9\u7ea2\u9ed1\u6811\u4e86\u89e3\u591a\u5c11\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ea2\u9ed1\u6811\u7684\u6839\u8282\u70b9\u5fc5\u987b\u662f\u9ed1\u7684\uff0c\u53f6\u5b50\u8282\u70b9\u5fc5\u987b\u662f\u9ed1\u7684\uff0c\u7ea2\u8282\u70b9\u4e0b\u7684\u4e00\u5b9a\u662f\u9ed1\u8282\u70b9\uff0c\u4ece\u4efb\u4e00\u8282\u70b9\u5230\u5176\u6bcf\u4e2a\u53f6\u5b50\u7684\u6240\u6709\u7b80\u5355\u8def\u5f84\u90fd\u5305\u542b\u76f8\u540c\u6570\u76ee\u7684\u9ed1\u8272\u8282\u70b9\uff0c\u6bcf\u4e2a\u8282\u70b9\u8981\u4e48\u662f\u7ea2\u8272\uff0c\u8981\u4e48\u662f\u9ed1\u8272<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4ec0\u4e48\u4e0d\u7528\u4e8c\u53c9\u6811\uff0c\u5e73\u8861\u4e8c\u53c9\u6811\uff0c\u94fe\u8868\u4e3a\u4ec0\u4e48\u8981\u5347\u7ea7\u6210\u7ea2\u9ed1\u4e8c\u53c9\u6811<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e8c\u53c9\u6811\u6709\u6982\u7387\u9000\u5316\u6210\u94fe\u8868\uff0c\u5e73\u8861\u4e8c\u53c9\u6811\u7ef4\u62a4\u56f0\u96be\uff0c\u94fe\u8868\u592a\u957f\u7684\u8bdd\u641c\u7d22\u65f6\u95f4\u6162\uff0c\u7ea2\u9ed1\u6811\u7684\u67e5\u627e\u590d\u6742\u5ea6\u662fO(Log n)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">8.HashMap \u7684 put \u6d41\u7a0b\u77e5\u9053\u5417\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u54c8\u5e0c\u5bfb\u5740 \u2192 \u5904\u7406\u54c8\u5e0c\u51b2\u7a81\uff08\u94fe\u8868\u8fd8\u662f\u7ea2\u9ed1\u6811\uff09\u2192\u63d2\u5165\/\u8986\u76d6\u8282\u70b9 \u2192 \u5224\u65ad\u662f\u5426\u9700\u8981\u6269\u5bb9 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b2c\u4e00\u6b65\uff0c\u901a\u8fc7 hash \u65b9\u6cd5\u8fdb\u4e00\u6b65\u6270\u52a8\u54c8\u5e0c\u503c\uff0c\u4ee5\u51cf\u5c11\u54c8\u5e0c\u51b2\u7a81\u3002<br>\u7b2c\u4e8c\u6b65\uff0c\u8fdb\u884c\u7b2c\u4e00\u6b21\u7684\u6570\u7ec4\u6269\u5bb9\uff1b\u5e76\u4f7f\u7528\u54c8\u5e0c\u503c\u548c\u6570\u7ec4\u957f\u5ea6\u8fdb\u884c\u53d6\u6a21\u8fd0\u7b97\uff0c\u786e\u5b9a\u7d22\u5f15\u4f4d\u7f6e\u3002\u5982\u679c\u5f53\u524d\u4f4d\u7f6e\u4e3a\u7a7a\uff0c\u76f4\u63a5\u5c06\u952e\u503c\u5bf9\u63d2\u5165\u8be5\u4f4d\u7f6e\uff1b\u5426\u5219\u5224\u65ad\u5f53\u524d\u4f4d\u7f6e\u7684\u7b2c\u4e00\u4e2a\u8282\u70b9\u662f\u5426\u4e0e\u65b0\u8282\u70b9\u7684 key \u76f8\u540c\uff0c\u5982\u679c\u76f8\u540c\u76f4\u63a5\u8986\u76d6 value\uff0c\u5982\u679c\u4e0d\u540c\uff0c\u8bf4\u660e\u53d1\u751f\u54c8\u5e0c\u51b2\u7a81\u3002\u5982\u679c\u662f\u94fe\u8868\uff0c\u5c06\u65b0\u8282\u70b9\u6dfb\u52a0\u5230\u94fe\u8868\u7684\u5c3e\u90e8\uff1b\u5982\u679c\u94fe\u8868\u957f\u5ea6\u5927\u4e8e\u7b49\u4e8e 8\uff0c\u5219\u5c06\u94fe\u8868\u8f6c\u6362\u4e3a\u7ea2\u9ed1\u6811\u3002<br>\u6bcf\u6b21\u63d2\u5165\u65b0\u5143\u7d20\u540e\uff0c\u68c0\u67e5\u662f\u5426\u9700\u8981\u6269\u5bb9\uff0c\u5982\u679c\u5f53\u524d\u5143\u7d20\u4e2a\u6570\u5927\u4e8e\u9608\u503c\uff08<code>capacity * loadFactor<\/code>\uff09\uff0c\u5219\u8fdb\u884c\u6269\u5bb9\uff0c\u6269\u5bb9\u540e\u7684\u6570\u7ec4\u5927\u5c0f\u662f\u539f\u6765\u7684 2 \u500d\uff1b\u5e76\u4e14\u91cd\u65b0\u8ba1\u7b97\u6bcf\u4e2a\u8282\u70b9\u7684\u7d22\u5f15\uff0c\u8fdb\u884c\u6570\u636e\u91cd\u65b0\u5206\u5e03\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ea\u91cd\u5199\u5143\u7d20\u7684 equals \u65b9\u6cd5\u6ca1\u91cd\u5199 hashCode\uff0cput \u7684\u65f6\u5019\u4f1a\u53d1\u751f\u4ec0\u4e48?<br>\u5982\u679c\u53ea\u91cd\u5199 equals \u65b9\u6cd5\uff0c\u6ca1\u6709\u91cd\u5199 hashCode \u65b9\u6cd5\uff0c\u90a3\u4e48\u4f1a\u5bfc\u81f4 equals \u76f8\u7b49\u7684\u4e24\u4e2a\u5bf9\u8c61\uff0chashCode \u4e0d\u76f8\u7b49\uff0c\u8fd9\u6837\u7684\u8bdd\uff0c\u4e24\u4e2a\u5bf9\u8c61\u4f1a\u88ab put \u5230\u6570\u7ec4\u4e2d\u4e0d\u540c\u7684\u4f4d\u7f6e\uff0c\u5bfc\u81f4 get \u7684\u65f6\u5019\uff0c\u65e0\u6cd5\u83b7\u53d6\u5230\u6b63\u786e\u7684\u503c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">9.HashMap \u600e\u4e48\u67e5\u627e\u5143\u7d20\u7684\u5462\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u54c8\u5e0c\u503c\u5b9a\u4f4d\u7d22\u5f15 \u2192 \u5b9a\u4f4d\u6876 \u2192 \u68c0\u67e5\u7b2c\u4e00\u4e2a\u8282\u70b9 \u2192 \u904d\u5386\u94fe\u8868\u6216\u7ea2\u9ed1\u6811\u67e5\u627e \u2192 \u8fd4\u56de\u7ed3\u679c\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/lsuccess.xyz\/wp-content\/uploads\/2025\/08\/image.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"741\" data-original=\"http:\/\/lsuccess.xyz\/wp-content\/uploads\/2025\/08\/image.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-186\"  sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/div><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">10.HashMap \u7684 hash \u51fd\u6570\u662f\u600e\u4e48\u8bbe\u8ba1\u7684?\u4e3a\u4ec0\u4e48 hash \u51fd\u6570\u80fd\u51cf\u5c11\u54c8\u5e0c\u51b2\u7a81\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u62ff\u5230 key \u7684\u54c8\u5e0c\u503c\uff0c\u662f\u4e00\u4e2a 32 \u4f4d\u7684 int \u7c7b\u578b\u6570\u503c\uff0c\u7136\u540e\u518d\u8ba9\u54c8\u5e0c\u503c\u7684\u9ad8 16 \u4f4d\u548c\u4f4e 16 \u4f4d\u8fdb\u884c\u5f02\u6216\u64cd\u4f5c\uff0c\u8fd9\u6837\u80fd\u4fdd\u8bc1\u54c8\u5e0c\u5206\u5e03\u5747\u5300\u3002\u54c8\u5e0c\u8868\u7684\u7d22\u5f15\u662f\u901a\u8fc7\u00a0<code>h &amp; (n-1)<\/code>\u00a0\u8ba1\u7b97\u7684\uff0cn \u662f\u5e95\u5c42\u6570\u7ec4\u7684\u5bb9\u91cf\uff1bn-1 \u548c\u67d0\u4e2a\u54c8\u5e0c\u503c\u505a\u00a0<code>&amp;<\/code>\u00a0\u8fd0\u7b97\uff0c\u76f8\u5f53\u4e8e\u622a\u53d6\u4e86\u6700\u4f4e\u7684\u56db\u4f4d\u3002\u5982\u679c\u6570\u7ec4\u7684\u5bb9\u91cf\u5f88\u5c0f\uff0c\u53ea\u53d6 h \u7684\u4f4e\u4f4d\u5f88\u5bb9\u6613\u5bfc\u81f4\u54c8\u5e0c\u51b2\u7a81\u3002\u901a\u8fc7\u5f02\u6216\u64cd\u4f5c\u5c06 h \u7684\u9ad8\u4f4d\u5f15\u5165\u4f4e\u4f4d\uff0c\u53ef\u4ee5\u589e\u52a0\u54c8\u5e0c\u503c\u7684\u968f\u673a\u6027\uff0c\u4ece\u800c\u51cf\u5c11\u54c8\u5e0c\u51b2\u7a81\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">11.\u5982\u679c\u521d\u59cb\u5316 HashMap\uff0c\u4f20\u4e00\u4e2a 17 \u7684\u5bb9\u91cf\uff0c\u5b83\u4f1a\u600e\u4e48\u5904\u7406\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6269\u5bb9\u5230\u6700\u63a5\u8fd1\u7684\u6700\u5c0f2\u7684\u5e42\u6b21\u65b9\uff0c\u4e5f\u5c31\u662f32\uff0c\u81f3\u4e8e\u4e3a\u4ec0\u4e48\u603b\u662f2\u7684\u5e42\u6b21\u65b9\uff0c\u662f\u4e3a\u4e86\u65b9\u4fbf\u8ba1\u7b97\u7d22\u5f15\u7684\u4e0b\u6807\uff0c2\u7684\u5e42\u6b21\u65b9-1\u7684\u4f4d\u8fd0\u7b97\u5168\u662f1\uff0c\u53ef\u4ee5\u4fdd\u8bc1hash\u503c\u7684\u4f4e\u4f4d\u4e5f\u53c2\u4e0e\u8fd0\u7b97\uff0c\u51cf\u5c11\u51b2\u7a81\u6982\u7387\u3002\u5e76\u4e14\u4f7f\u7528\u4f4d\u8fd0\u7b97\u4e5f\u662f\u6bd4%\u6548\u7387\u66f4\u9ad8<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">12.\u89e3\u51b3\u54c8\u5e0c\u51b2\u7a81\u6709\u54ea\u4e9b\u65b9\u6cd5\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u518d\u54c8\u5e0c\u6cd5\u3001\u5f00\u653e\u5730\u5740\u6cd5\u548c\u62c9\u94fe\u6cd5\u3002HashMap\u4f7f\u7528\u7684\u5c31\u662f\u62c9\u94fe\u6cd5(\u94fe\u8868\u90e8\u5206)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u600e\u4e48\u5224\u65ad key \u76f8\u7b49\u5462\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><br><strong>hashCode()<\/strong>\u00a0\uff1a\u4f7f\u7528<code>key<\/code>\u7684<code>hashCode()<\/code>\u65b9\u6cd5\u8ba1\u7b97<code>key<\/code>\u7684\u54c8\u5e0c\u7801\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>equals()<\/strong>\u00a0\uff1a\u5f53\u4e24\u4e2a<code>key<\/code>\u7684\u54c8\u5e0c\u7801\u76f8\u540c\u65f6\uff0c<code>HashMap<\/code>\u8fd8\u4f1a\u8c03\u7528<code>key<\/code>\u7684<code>equals()<\/code>\u65b9\u6cd5\u8fdb\u884c\u7cbe\u786e\u6bd4\u8f83\u3002\u53ea\u6709\u5f53<code>equals()<\/code>\u65b9\u6cd5\u8fd4\u56de<code>true<\/code>\u65f6\uff0c\u4e24\u4e2a<code>key<\/code>\u624d\u88ab\u8ba4\u4e3a\u662f\u5b8c\u5168\u76f8\u540c\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4e24\u4e2a<code>key<\/code>\u7684\u5f15\u7528\u6307\u5411\u4e86\u540c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u90a3\u4e48\u5b83\u4eec\u7684<code>hashCode()<\/code>\u548c<code>equals()<\/code>\u65b9\u6cd5\u90fd\u4f1a\u8fd4\u56de<code>true<\/code>\uff0c\u6240\u4ee5\u5728 equals \u5224\u65ad\u4e4b\u524d\u53ef\u4ee5\u5148\u4f7f\u7528<code>==<\/code>\u8fd0\u7b97\u7b26\u5224\u65ad\u4e00\u6b21\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">13.HashMap\u7684\u6269\u5bb9\u673a\u5236\u4e86\u89e3\u5417\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u90e8\u5206\u7684\u5185\u5bb9\u5728\u524d\u9762\u6709\u8fc7\u53d9\u8ff0\u4e86\uff0c\u8be6\u7ec6\u70b9\u7684\u5730\u65b9\u5c31\u662f\u6269\u5bb9\u7684\u65b9\u6cd5\uff0c\u5728JDK8\u4e2d\u4f7f\u7528\u4e86\u5c3e\u63d2\u6cd5\uff0c\u5e76\u4e14\u5f53\u00a0<code>(e.hash &amp; oldCap) == 0<\/code>\u00a0\u65f6\uff0c\u5143\u7d20\u4fdd\u7559\u5728\u539f\u7d22\u5f15\u7684\u4f4d\u7f6e\uff1b\u5426\u5219\u5143\u7d20\u79fb\u52a8\u5230\u539f\u7d22\u5f15 + \u65e7\u6570\u7ec4\u5927\u5c0f\u7684\u4f4d\u7f6e\u3002\u5728JDK7\u4e2d\u4f7f\u7528\u5934\u63d2\u6cd5\uff0c\u6211\u4eec\u5c31\u9700\u8981\u5bf9\u6bcf\u4e2a\u5143\u7d20\u91cd\u65b0\u8fdb\u884chash\u8ba1\u7b97<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">14.HashMap \u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u5417\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u662f\uff0c\u8981\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u7684\u8bdd\u63a8\u8350\u4f7f\u7528CurrentHashMap(\u5185\u6709CAS\u9501\u548csynchronized \u5173\u952e\u5b57\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168)\uff0c\u5728\u591a\u7ebf\u7a0b\u4e0b\u53ef\u80fd\u4f1a\u5bfc\u81f4\u73af\u72b6\u94fe\u8868\uff0c\u5f53Put\u89e6\u53d1\u6269\u5bb9\u7684\u65f6\u5019\uff0c\u5176\u5b83\u7ebf\u7a0b\u53c8\u5728get\uff0c\u53ef\u80fd\u627e\u4e0d\u5230\u7ed3\u679c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">15.HashMap \u5185\u90e8\u8282\u70b9\u662f\u6709\u5e8f\u7684\u5417\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u65e0\u5e8f\u7684\uff0c\u6839\u636e hash \u503c\u968f\u673a\u63d2\u5165\uff0c\u8981\u5b9e\u73b0\u6709\u5e8f\u5c31\u5f97\u4f7f\u7528LinkedHashMap\uff0c\u5176\u7ef4\u62a4\u4e86\u4e00\u4e2a\u53cc\u5411\u94fe\u8868<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">16.TreeMap \u548c HashMap \u7684\u533a\u522b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap \u662f\u57fa\u4e8e\u6570\u7ec4+\u94fe\u8868+\u7ea2\u9ed1\u6811\u5b9e\u73b0\u7684\uff0cput \u5143\u7d20\u7684\u65f6\u5019\u4f1a\u5148\u8ba1\u7b97 key \u7684\u54c8\u5e0c\u503c\uff0c\u7136\u540e\u901a\u8fc7\u54c8\u5e0c\u503c\u8ba1\u7b97\u51fa\u5143\u7d20\u5728\u6570\u7ec4\u4e2d\u7684\u5b58\u653e\u4e0b\u6807\uff0c\u7136\u540e\u5c06\u5143\u7d20\u63d2\u5165\u5230\u6307\u5b9a\u7684\u4f4d\u7f6e\uff0c\u5982\u679c\u53d1\u751f\u54c8\u5e0c\u51b2\u7a81\uff0c\u4f1a\u4f7f\u7528\u94fe\u8868\u6765\u89e3\u51b3\uff0c\u5982\u679c\u94fe\u8868\u957f\u5ea6\u5927\u4e8e 8\uff0c\u4f1a\u8f6c\u6362\u4e3a\u7ea2\u9ed1\u6811\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">TreeMap \u662f\u57fa\u4e8e\u7ea2\u9ed1\u6811\u5b9e\u73b0\u7684\uff0cput \u5143\u7d20\u7684\u65f6\u5019\u4f1a\u5148\u5224\u65ad\u6839\u8282\u70b9\u662f\u5426\u4e3a\u7a7a\uff0c\u5982\u679c\u4e3a\u7a7a\uff0c\u76f4\u63a5\u63d2\u5165\u5230\u6839\u8282\u70b9\uff0c\u5982\u679c\u4e0d\u4e3a\u7a7a\uff0c\u4f1a\u901a\u8fc7 key \u7684\u6bd4\u8f83\u5668\u6765\u5224\u65ad\u5143\u7d20\u5e94\u8be5\u63d2\u5165\u5230\u5de6\u5b50\u6811\u8fd8\u662f\u53f3\u5b50\u6811\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u6ca1\u6709\u53d1\u751f\u54c8\u5e0c\u51b2\u7a81\u7684\u60c5\u51b5\u4e0b\uff0cHashMap \u7684\u67e5\u627e\u6548\u7387\u662f&nbsp;<code>O(1)<\/code>\u3002\u9002\u7528\u4e8e\u67e5\u627e\u64cd\u4f5c\u6bd4\u8f83\u9891\u7e41\u7684\u573a\u666f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">TreeMap \u7684\u67e5\u627e\u6548\u7387\u662f&nbsp;<code>O(logn)<\/code>\u3002\u5e76\u4e14\u4fdd\u8bc1\u4e86\u5143\u7d20\u7684\u987a\u5e8f\uff0c\u56e0\u6b64\u9002\u7528\u4e8e\u9700\u8981\u5927\u91cf\u8303\u56f4\u67e5\u627e\u6216\u8005\u6709\u5e8f\u904d\u5386\u7684\u573a\u666f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u7528\u4e8e\u7edf\u4e00\u6574\u7406JavaSE\u4e2d\u7684\u96c6\u5408\u6846\u67b6\u5e38\u89c1\u516b\u80a1\u95ee\u9898\uff0c\u4f1a\u968f\u7740\u9762\u8bd5\u5185\u5bb9\u8fdb\u884c\u66f4\u65b0 1.\u5e38\u7528\u7684\u96c6\u5408\u6846\u67b6\u6709\u54ea\u4e9b \u6b64\u5904\u914d [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,1,8],"tags":[],"class_list":["post-182","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","category-learn","category-8"],"_links":{"self":[{"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/posts\/182","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=182"}],"version-history":[{"count":4,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/posts\/182\/revisions"}],"predecessor-version":[{"id":187,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/posts\/182\/revisions\/187"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/media\/7"}],"wp:attachment":[{"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}