{"id":39097,"date":"2024-11-26T14:31:28","date_gmt":"2024-11-26T06:31:28","guid":{"rendered":"https:\/\/fwq.ai\/blog\/39097\/"},"modified":"2024-11-26T14:31:28","modified_gmt":"2024-11-26T06:31:28","slug":"java%e4%b8%ad%e6%80%8e%e4%b9%88%e5%be%80%e6%95%b0%e7%bb%84%e9%87%8c%e5%8a%a0%e6%95%b0","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/39097\/","title":{"rendered":"java\u4e2d\u600e\u4e48\u5f80\u6570\u7ec4\u91cc\u52a0\u6570"},"content":{"rendered":"<blockquote><p>\n  \u5411 java \u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a\u83b7\u53d6\u6570\u7ec4\u957f\u5ea6\uff0c\u521b\u5efa\u4e00\u4e2a\u957f\u5ea6\u66f4\u5927\u7684\u65b0\u6570\u7ec4\uff0c\u590d\u5236\u65e7\u6570\u7ec4\u6570\u636e\u5e76\u6dfb\u52a0\u65b0\u5143\u7d20\uff1b\u521b\u5efa\u4e00\u4e2a arraylist\uff0c\u4f7f\u7528 add() \u65b9\u6cd5\u6dfb\u52a0\u5143\u7d20\uff0c\u7136\u540e\u5c06 arraylist \u8f6c\u6362\u4e3a\u6570\u7ec4\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/16\/2024111604004491395.jpg\" class=\"aligncenter\" title=\"java\u4e2d\u600e\u4e48\u5f80\u6570\u7ec4\u91cc\u52a0\u6570\u63d2\u56fe\" alt=\"java\u4e2d\u600e\u4e48\u5f80\u6570\u7ec4\u91cc\u52a0\u6570\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u5411 Java \u4e2d\u7684\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20<\/strong><\/p>\n<p>\u5411 Java \u4e2d\u7684\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u6709\u4e24\u79cd\u4e3b\u8981\u65b9\u6cd5\uff1a<\/p>\n<p><strong>1. \u4f7f\u7528\u6570\u7ec4\u957f\u5ea6<\/strong><\/p>\n<ul>\n<li>\u83b7\u53d6\u5f53\u524d\u6570\u7ec4\u957f\u5ea6\uff08arr.length\uff09\u3002<\/li>\n<li>\u6839\u636e\u957f\u5ea6\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff08newArr\uff09\uff0c\u5176\u957f\u5ea6\u6bd4\u65e7\u6570\u7ec4\u957f\u3002<\/li>\n<li>\u5c06\u65e7\u6570\u7ec4\u590d\u5236\u5230\u65b0\u6570\u7ec4\u4e2d\uff08System.arraycopy(arr, 0, newArr, 0, arr.length)\uff09\u3002<\/li>\n<li>\u5728\u65b0\u6570\u7ec4\u672b\u5c3e\u6dfb\u52a0\u65b0\u5143\u7d20\u3002<\/li>\n<\/ul>\n<pre>int[] arr = {1, 2, 3};\nint[] newArr = new int[arr.length + 1];\nSystem.arraycopy(arr, 0, newArr, 0, arr.length);\nnewArr[arr.length] = 4;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>2. \u4f7f\u7528 ArrayList<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<ul>\n<li>\u521b\u5efa\u4e00\u4e2a ArrayList \u5bf9\u8c61\u3002<\/li>\n<li>\u4f7f\u7528 add() \u65b9\u6cd5\u5c06\u5143\u7d20\u6dfb\u52a0\u5230 ArrayList \u4e2d\u3002<\/li>\n<li>\u5c06 ArrayList \u8f6c\u6362\u4e3a\u6570\u7ec4\uff08arr = arrayList.toArray(new Integer[0])\uff09\u3002<\/li>\n<\/ul>\n<pre>List&lt;Integer&gt; arrayList = new ArrayList&lt;&gt;();\narrayList.add(1);\narrayList.add(2);\narrayList.add(3);\nint[] arr = arrayList.toArray(new Integer[0]);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u4e2d\u600e\u4e48\u5f80\u6570\u7ec4\u91cc\u52a0\u6570\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5411 java \u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a\u83b7\u53d6\u6570\u7ec4\u957f\u5ea6\uff0c\u521b\u5efa\u4e00\u4e2a\u957f\u5ea6\u66f4\u5927\u7684\u65b0\u6570\u7ec4\uff0c\u590d\u5236\u65e7\u6570\u7ec4\u6570\u636e\u5e76\u6dfb\u52a0\u65b0\u5143\u7d20\uff1b\u521b\u5efa\u4e00\u4e2a arraylist\uff0c\u4f7f\u7528 add() \u65b9\u6cd5\u6dfb\u52a0\u5143\u7d20\uff0c\u7136\u540e\u5c06 arraylist \u8f6c\u6362\u4e3a\u6570\u7ec4\u3002 \u5982\u4f55\u5411 Java \u4e2d\u7684\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20 \u5411 Java \u4e2d\u7684\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u6709\u4e24\u79cd\u4e3b\u8981\u65b9\u6cd5\uff1a 1. \u4f7f\u7528\u6570\u7ec4\u957f\u5ea6 \u83b7\u53d6\u5f53\u524d\u6570\u7ec4\u957f\u5ea6\uff08arr.length\uff09\u3002 \u6839\u636e\u957f\u5ea6\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff08newArr\uff09\uff0c\u5176\u957f\u5ea6\u6bd4\u65e7\u6570\u7ec4\u957f\u3002 \u5c06\u65e7\u6570\u7ec4\u590d\u5236\u5230\u65b0\u6570\u7ec4\u4e2d\uff08System.arraycopy(arr, 0, newArr, 0, arr.length)\uff09\u3002 \u5728\u65b0\u6570\u7ec4\u672b\u5c3e\u6dfb\u52a0\u65b0\u5143\u7d20\u3002 int[] arr = {1, 2, 3}; int[] newArr = new int[arr.length + 1]; System.arraycopy(arr, 0, newArr, 0, arr.length); newArr[arr.length] = 4; \u767b\u5f55\u540e\u590d\u5236 2. \u4f7f\u7528 ArrayList \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u521b\u5efa\u4e00\u4e2a ArrayList \u5bf9\u8c61\u3002 \u4f7f\u7528 add() [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-39097","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39097","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=39097"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39097\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=39097"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=39097"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=39097"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}