{"id":301585,"date":"2024-05-20T18:12:08","date_gmt":"2024-05-20T10:12:08","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/301585.html"},"modified":"2024-05-20T18:12:27","modified_gmt":"2024-05-20T10:12:27","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88-arraylist-%e7%ba%bf%e7%a8%8b%e4%b8%8d%e5%ae%89%e5%85%a8%e8%bf%98%e8%a6%81%e7%94%a8","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/301585.html","title":{"rendered":"\u4e3a\u4ec0\u4e48 ArrayList \u7ebf\u7a0b\u4e0d\u5b89\u5168\u8fd8\u8981\u7528"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/26213729\/fadcf1df-38d1-4d07-8749-979057402473.webp\" alt=\"\u4e3a\u4ec0\u4e48 ArrayList \u7ebf\u7a0b\u4e0d\u5b89\u5168\u8fd8\u8981\u7528\" \/><\/p>\n<p><p>ArrayList \u7ebf\u7a0b\u4e0d\u5b89\u5168\u8fd8\u8981\u4f7f\u7528\u7684\u539f\u56e0\u5728\u4e8e\u5176<strong>\u9ad8\u6548\u7684\u6570\u636e\u8bbf\u95ee\u6027\u80fd<\/strong>\u3001<strong>\u52a8\u6001\u6269\u5bb9\u673a\u5236<\/strong>\u3001\u4ee5\u53ca<strong>API\u7684\u4e30\u5bcc\u6027<\/strong>\u3002\u5c24\u5176\u662f\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0cArrayList \u63d0\u4f9b\u4e86\u6781\u9ad8\u7684\u6570\u636e\u5904\u7406\u901f\u5ea6\u3002<strong>ArrayList \u7684\u52a8\u6001\u6269\u5bb9\u673a\u5236<\/strong>\uff0c\u5141\u8bb8\u5b83\u5728\u8fd0\u884c\u65f6\u6839\u636e\u9700\u8981\u81ea\u52a8\u589e\u52a0\u5b58\u50a8\u80fd\u529b\uff0c\u8fd9\u4e00\u70b9\u5bf9\u4e8e\u5728\u7f16\u8bd1\u65f6\u65e0\u6cd5\u786e\u5b9a\u96c6\u5408\u5927\u5c0f\u7684\u5e94\u7528\u573a\u666f\u81f3\u5173\u91cd\u8981\u3002\u5f53\u6dfb\u52a0\u5143\u7d20\u65f6\uff0c\u5982\u679c\u5bb9\u91cf\u4e0d\u8db3\u4ee5\u5bb9\u7eb3\u66f4\u591a\u7684\u5143\u7d20\uff0cArrayList \u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\uff0c\u5176\u5bb9\u91cf\u662f\u65e7\u6570\u7ec4\u5bb9\u91cf\u76841.5\u500d\uff08\u6216\u6307\u5b9a\u7684\u589e\u957f\u56e0\u5b50\uff09\uff0c\u7136\u540e\u5c06\u65e7\u6570\u7ec4\u7684\u5185\u5bb9\u590d\u5236\u5230\u65b0\u6570\u7ec4\u4e2d\uff0c\u5e76\u6dfb\u52a0\u65b0\u5143\u7d20\u3002\u8fd9\u4e2a\u673a\u5236\u4f7f\u5f97ArrayList\u80fd\u591f\u7075\u6d3b\u5730\u5904\u7406\u6570\u636e\u96c6\u5408\u7684\u589e\u957f\uff0c\u540c\u65f6\u4fdd\u6301\u4e86\u8f83\u4f4e\u7684\u5185\u5b58\u6d88\u8017\u548c\u9ad8\u6548\u7684\u968f\u673a\u8bbf\u95ee\u6027\u80fd\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u9ad8\u6548\u7684\u6570\u636e\u8bbf\u95ee\u6027\u80fd<\/h3>\n<\/p>\n<p><p>ArrayList \u57fa\u4e8e\u6570\u7ec4\u5b9e\u73b0\uff0c\u652f\u6301\u968f\u673a\u8bbf\u95ee\uff0c\u80fd\u591f<strong>\u63d0\u4f9b\u5feb\u901f\u7684\u8bfb\u53d6\u548c\u4fee\u6539\u64cd\u4f5c<\/strong>\u3002\u6570\u7ec4\u7684\u968f\u673a\u8bbf\u95ee\u80fd\u529b\u610f\u5473\u7740\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u7d22\u5f15\u8bbf\u95ee\u4efb\u4f55\u4f4d\u7f6e\u7684\u5143\u7d20\uff0c\u8fd9\u6837\u7684\u8bbf\u95ee\u65f6\u95f4\u590d\u6742\u5ea6\u662fO(1)\uff0c\u8fdc\u8fdc\u9ad8\u4e8e\u57fa\u4e8e\u94fe\u8868\u5b9e\u73b0\u7684\u96c6\u5408\uff08\u5982LinkedList\uff09\u7684\u8bbf\u95ee\u901f\u5ea6\u3002\u5728\u5904\u7406\u5927\u91cf\u6570\u636e\u65f6\uff0c\u8fd9\u79cd\u8bbf\u95ee\u901f\u5ea6\u7684\u4f18\u52bf\u5c24\u5176\u660e\u663e\u3002<\/p>\n<\/p>\n<p><p>\u53e6\u5916\uff0cArrayList \u5728\u8fdb\u884c\u6279\u91cf\u64cd\u4f5c\u65f6\u4e5f\u8868\u73b0\u51fa\u4e86\u6781\u9ad8\u7684\u6548\u7387\uff0c\u5982<code>addAll<\/code>\u3001<code>removeAll<\/code>\u7b49\u65b9\u6cd5\u90fd\u8fdb\u884c\u4e86\u4f18\u5316\uff0c\u80fd\u591f\u5feb\u901f\u8c03\u6574\u5176\u5185\u90e8\u6570\u7ec4\u7684\u5927\u5c0f\uff0c\u9ad8\u6548\u5730\u5904\u7406\u5927\u91cf\u6570\u636e\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u52a8\u6001\u6269\u5bb9\u673a\u5236<\/h3>\n<\/p>\n<p><p>\u5982\u524d\u6240\u8ff0\uff0cArrayList \u80fd\u591f\u6839\u636e\u9700\u8981\u81ea\u52a8\u6269\u5bb9\uff0c\u8fd9\u4f7f\u5f97\u5f00\u53d1\u8005\u5728\u4f7f\u7528\u65f6\u65e0\u9700\u5173\u5fc3\u5bb9\u91cf\u95ee\u9898\u3002\u8fd9\u4e2a\u52a8\u6001\u6269\u5bb9\u673a\u5236\u662f\u901a\u8fc7\u5728\u6dfb\u52a0\u5143\u7d20\u65f6\u68c0\u67e5\u5bb9\u91cf\u5e76\u5728\u9700\u8981\u65f6\u6269\u5c55\u5b9e\u73b0\u7684\uff0c\u5177\u4f53\u8fc7\u7a0b\u5305\u62ec\u7533\u8bf7\u4e00\u4e2a\u66f4\u5927\u7684\u6570\u7ec4\u3001\u590d\u5236\u65e7\u6570\u7ec4\u7684\u5143\u7d20\u5230\u65b0\u6570\u7ec4\u3001\u7136\u540e\u6dfb\u52a0\u65b0\u5143\u7d20\u3002<\/p>\n<\/p>\n<p><p>\u8fd9\u4e00\u673a\u5236\u4fdd\u8bc1\u4e86\u5f53\u6dfb\u52a0\u5927\u91cf\u5143\u7d20\u65f6\uff0cArrayList \u80fd\u591f\u6839\u636e\u9700\u8981\u589e\u52a0\u5b58\u50a8\u5bb9\u91cf\uff0c\u4ece\u800c\u907f\u514d\u4e86\u6570\u7ec4\u6ea2\u51fa\u7684\u95ee\u9898\u3002\u867d\u7136\u6269\u5bb9\u64cd\u4f5c\u672c\u8eab\u6709\u4e00\u5b9a\u7684\u6027\u80fd\u5f00\u9500\uff0c\u4f46\u662f\u8fd9\u79cd\u5f00\u9500\u662f\u53ef\u4ee5\u63a5\u53d7\u7684\uff0c\u5c24\u5176\u662f\u8003\u8651\u5230\u5b83\u63d0\u4f9b\u7684\u7075\u6d3b\u6027\u548c\u9ad8\u6548\u7684\u6570\u636e\u8bbf\u95ee\u80fd\u529b\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001API \u7684\u4e30\u5bcc\u6027<\/h3>\n<\/p>\n<p><p>ArrayList \u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684API\u7528\u4e8e\u6570\u636e\u64cd\u4f5c\uff0c\u5305\u62ec\u5bf9\u5143\u7d20\u7684\u589e\u52a0\u3001\u5220\u9664\u3001\u4fee\u6539\u4ee5\u53ca\u67e5\u8be2\u7b49\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u5b83\u8fd8\u63d0\u4f9b\u4e86\u6392\u5e8f\u3001\u968f\u673a\u8bbf\u95ee\u7b49\u529f\u80fd\uff0c\u4f7f\u5f97\u5f00\u53d1\u8005\u80fd\u591f\u65b9\u4fbf\u5730\u5bf9\u96c6\u5408\u8fdb\u884c\u7ba1\u7406\u548c\u64cd\u4f5c\u3002<\/p>\n<\/p>\n<p><p>\u8fd9\u4e9bAPI\u4e0d\u4ec5\u5305\u542b\u5728List\u63a5\u53e3\u4e2d\u5b9a\u4e49\u7684\u6807\u51c6\u64cd\u4f5c\uff0c\u8fd8\u589e\u52a0\u4e86\u4e00\u4e9b\u9488\u5bf9ArrayList\u7279\u6027\u4f18\u5316\u7684\u65b9\u6cd5\uff0c\u5982<code>ensureCapacity<\/code>\u65b9\u6cd5\u7528\u4e8e\u63d0\u524d\u589e\u52a0\u5b58\u50a8\u5bb9\u91cf\uff0c\u4ece\u800c\u51cf\u5c11\u52a8\u6001\u6269\u5bb9\u65f6\u7684\u6027\u80fd\u5f00\u9500\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u4e3a\u4f55\u5728\u9700\u8981\u7ebf\u7a0b\u5b89\u5168\u7684\u73af\u5883\u4e2d\u4ecd\u7136\u4f7f\u7528ArrayList<\/h3>\n<\/p>\n<p><p>\u5c3d\u7ba1ArrayList\u7ebf\u7a0b\u4e0d\u5b89\u5168\uff0c\u4f46\u5728\u8bb8\u591a\u60c5\u51b5\u4e0b\uff0c\u901a\u8fc7\u5916\u90e8\u540c\u6b65\u673a\u5236\u6216\u8005\u4f7f\u7528\u5e76\u53d1\u96c6\u5408\u7c7b\uff08\u5982CopyOnWriteArrayList\uff09\u8f6c\u6362\uff0c\u4ecd\u7136\u53ef\u4ee5\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u5b89\u5168\u5730\u4f7f\u7528\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528<code>Collections.synchronizedList<\/code>\u65b9\u6cd5\u5c06ArrayList\u8f6c\u6362\u4e3a\u7ebf\u7a0b\u5b89\u5168\u7684\u5217\u8868\u3002<\/p>\n<\/p>\n<p><p>\u5916\u90e8\u540c\u6b65\u901a\u5e38\u6bd4\u5728\u96c6\u5408\u5185\u90e8\u76f4\u63a5\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u8981\u7075\u6d3b\u8bb8\u591a\uff0c\u8fd9\u4f7f\u5f97\u5728\u9700\u8981\u65f6\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u6700\u5408\u9002\u7684\u540c\u6b65\u7b56\u7565\uff0c\u800c\u4e0d\u662f\u88ab\u8feb\u4f7f\u7528\u5185\u7f6e\u7684\u3001\u53ef\u80fd\u5e76\u4e0d\u5b8c\u5168\u7b26\u5408\u9700\u6c42\u7684\u540c\u6b65\u673a\u5236\u3002<\/p>\n<\/p>\n<p><p>\u603b\u4e4b\uff0c\u5c3d\u7ba1ArrayList\u7ebf\u7a0b\u4e0d\u5b89\u5168\uff0c\u4f46\u5176\u9ad8\u6548\u7684\u6570\u636e\u8bbf\u95ee\u6027\u80fd\u3001\u52a8\u6001\u6269\u5bb9\u673a\u5236\u3001\u4ee5\u53ca\u4e30\u5bcc\u7684API\u8ba9\u5b83\u6210\u4e3aJava\u4e2d\u6700\u5e7f\u6cdb\u4f7f\u7528\u7684\u96c6\u5408\u4e4b\u4e00\u3002\u5728\u5355\u7ebf\u7a0b\u5e94\u7528\u6216\u8005\u901a\u8fc7\u5408\u9002\u7684\u540c\u6b65\u7b56\u7565\uff0c\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u4e5f\u53ef\u4ee5\u5b89\u5168\u3001\u6709\u6548\u5730\u4f7f\u7528ArrayList\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>1. ArrayList\u4e3a\u4ec0\u4e48\u4f1a\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\uff1f<\/strong><\/p>\n<p>ArrayList\u662f\u4e00\u4e2a\u52a8\u6001\u6570\u7ec4\uff0c\u5b83\u5185\u90e8\u662f\u901a\u8fc7\u6570\u7ec4\u5b9e\u73b0\u7684\u3002\u5f53\u6211\u4eec\u5bf9ArrayList\u8fdb\u884c\u6dfb\u52a0\u3001\u5220\u9664\u6216\u4fee\u6539\u64cd\u4f5c\u65f6\uff0cArrayList\u4f1a\u6839\u636e\u9700\u8981\u8fdb\u884c\u6570\u7ec4\u7684\u6269\u5bb9\u6216\u7f29\u5bb9\u3002\u7136\u800c\uff0c\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u5982\u679c\u6709\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u5bf9ArrayList\u8fdb\u884c\u4fee\u6539\uff0c\u5c31\u4f1a\u5bfc\u81f4\u7ade\u4e89\u6761\u4ef6\u7684\u53d1\u751f\uff0c\u4ece\u800c\u4ea7\u751f\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u3002<\/p>\n<p><strong>2. \u65e2\u7136ArrayList\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\uff0c\u4e3a\u4ec0\u4e48\u8fd8\u8981\u4f7f\u7528\u5b83\uff1f<\/strong><\/p>\n<p>\u867d\u7136ArrayList\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\uff0c\u4f46\u5b83\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\u7684\u6027\u80fd\u975e\u5e38\u51fa\u8272\u3002\u7531\u4e8e\u4e0d\u9700\u8981\u8fdb\u884c\u7ebf\u7a0b\u5b89\u5168\u7684\u64cd\u4f5c\uff0cArrayList\u7684\u6dfb\u52a0\u3001\u5220\u9664\u548c\u4fee\u6539\u64cd\u4f5c\u975e\u5e38\u9ad8\u6548\u3002\u56e0\u6b64\uff0c\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u653e\u5fc3\u5730\u4f7f\u7528ArrayList\u6765\u63d0\u5347\u6027\u80fd\u3002<\/p>\n<p>\u53e6\u5916\uff0cJava\u63d0\u4f9b\u4e86\u4e00\u4e9b\u7ebf\u7a0b\u5b89\u5168\u7684List\u5b9e\u73b0\uff0c\u5982Vector\u548cCopyOnWriteArrayList\u3002\u4f46\u8fd9\u4e9b\u7ebf\u7a0b\u5b89\u5168\u7684\u96c6\u5408\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u7684\u6027\u80fd\u76f8\u5bf9\u8f83\u4f4e\u3002\u56e0\u6b64\uff0c\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u5982\u679c\u6ca1\u6709\u7279\u522b\u7684\u9700\u6c42\uff0c\u4f7f\u7528ArrayList\u5e76\u91c7\u53d6\u9002\u5f53\u7684\u540c\u6b65\u63aa\u65bd\uff08\u5982\u5728\u4f7f\u7528\u65f6\u8fdb\u884c\u52a0\u9501\uff09\u4e5f\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u505a\u6cd5\u3002<\/p>\n<p><strong>3. \u600e\u6837\u786e\u4fdd\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u5b89\u5168\u5730\u4f7f\u7528ArrayList\uff1f<\/strong><\/p>\n<p>\u5982\u679c\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u9700\u8981\u4f7f\u7528ArrayList\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\u786e\u4fdd\u7ebf\u7a0b\u5b89\u5168\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528\u7ebf\u7a0b\u5b89\u5168\u7684List\u5b9e\u73b0\uff0c\u5982Vector\u6216CopyOnWriteArrayList\uff1b<\/li>\n<li>\u901a\u8fc7synchronized\u5173\u952e\u5b57\u6216Lock\u5bf9\u8c61\u5bf9ArrayList\u8fdb\u884c\u52a0\u9501\uff0c\u786e\u4fdd\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u5bf9ArrayList\u8fdb\u884c\u4fee\u6539\uff1b<\/li>\n<li>\u4f7f\u7528\u5e76\u53d1\u5bb9\u5668\uff0c\u5982ConcurrentLinkedQueue\uff0c\u6765\u66ff\u4ee3ArrayList\u3002<\/li>\n<\/ul>\n<p>\u9700\u8981\u6839\u636e\u5177\u4f53\u573a\u666f\u548c\u9700\u6c42\u9009\u62e9\u9002\u5408\u7684\u65b9\u5f0f\u6765\u786e\u4fdd\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u5b89\u5168\u5730\u4f7f\u7528ArrayList\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"ArrayList \u7ebf\u7a0b\u4e0d\u5b89\u5168\u8fd8\u8981\u4f7f\u7528\u7684\u539f\u56e0\u5728\u4e8e\u5176\u9ad8\u6548\u7684\u6570\u636e\u8bbf\u95ee\u6027\u80fd\u3001\u52a8\u6001\u6269\u5bb9\u673a\u5236\u3001\u4ee5\u53caAPI\u7684\u4e30\u5bcc\u6027\u3002\u5c24\u5176\u662f [&hellip;]","protected":false},"author":3,"featured_media":301606,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/301585"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=301585"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/301585\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/301606"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=301585"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=301585"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=301585"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}