{"id":37953,"date":"2024-11-26T08:10:33","date_gmt":"2024-11-26T00:10:33","guid":{"rendered":"https:\/\/fwq.ai\/blog\/37953\/"},"modified":"2024-11-26T08:10:33","modified_gmt":"2024-11-26T00:10:33","slug":"java%e4%b8%ad%e6%80%8e%e4%b9%88%e5%a2%9e%e5%8a%a0%e6%95%b0%e7%bb%84","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/37953\/","title":{"rendered":"java\u4e2d\u600e\u4e48\u589e\u52a0\u6570\u7ec4"},"content":{"rendered":"<blockquote><p>\n  java \u4e2d\u589e\u52a0\u6570\u7ec4\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u4e09\u79cd\u65b9\u6cd5\u5b9e\u73b0\uff1a\u4f7f\u7528 arrays \u5de5\u5177\u7c7b\u4e2d\u7684 copyof() \u65b9\u6cd5\u8fdb\u884c\u6570\u7ec4\u6269\u5c55\u3002\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a arraylist \u6dfb\u52a0\u5143\u7d20\uff0c\u6700\u540e\u518d\u8f6c\u6362\u56de\u6570\u7ec4\u3002\u624b\u52a8\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\u5e76\u590d\u5236\u65e7\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff0c\u7136\u540e\u6dfb\u52a0\u65b0\u5143\u7d20\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/13\/2024111313461939694.jpg\" class=\"aligncenter\" title=\"java\u4e2d\u600e\u4e48\u589e\u52a0\u6570\u7ec4\u63d2\u56fe\" alt=\"java\u4e2d\u600e\u4e48\u589e\u52a0\u6570\u7ec4\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u5728 Java \u4e2d\u589e\u52a0\u6570\u7ec4<\/strong><\/p>\n<p><strong>\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528\u6570\u7ec4\u5de5\u5177\u7c7b<\/strong><\/p>\n<p>Java \u4e2d\u63d0\u4f9b\u4e86 Arrays \u5de5\u5177\u7c7b\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u64cd\u4f5c\u6570\u7ec4\u3002\u8981\u589e\u52a0\u6570\u7ec4\uff0c\u53ef\u4ee5\u4f7f\u7528 copyOf() \u65b9\u6cd5\uff1a<\/p>\n<pre>int[] oldArray = {1, 2, 3};\nint[] newArray = Arrays.copyOf(oldArray, oldArray.length + 1);\nnewArray[oldArray.length] = 4;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528 ArrayList<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p>\u867d\u7136\u6570\u7ec4\u65e0\u6cd5\u76f4\u63a5\u589e\u52a0\uff0c\u4f46\u53ef\u4ee5\u5c06\u5176\u8f6c\u6362\u4e3a ArrayList\uff0c\u7136\u540e\u6dfb\u52a0\u5143\u7d20\u3002\u6700\u540e\u518d\u5c06\u5176\u8f6c\u6362\u4e3a\u6570\u7ec4\uff1a<\/p>\n<pre>int[] oldArray = {1, 2, 3};\nList&lt;Integer&gt; list = new ArrayList&lt;&gt;(Arrays.asList(oldArray));\nlist.add(4);\nint[] newArray = list.stream().mapToInt(i -&gt; i).toArray();<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u65b9\u6cd5\u4e09\uff1a\u624b\u52a8\u521b\u5efa\u65b0\u6570\u7ec4<\/strong><\/p>\n<p>\u4e5f\u53ef\u4ee5\u624b\u52a8\u521b\u5efa\u65b0\u6570\u7ec4\u5e76\u590d\u5236\u65e7\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff0c\u7136\u540e\u6dfb\u52a0\u65b0\u5143\u7d20\uff1a<\/p>\n<pre>int[] oldArray = {1, 2, 3};\nint[] newArray = new int[oldArray.length + 1];\nSystem.arraycopy(oldArray, 0, newArray, 0, oldArray.length);\nnewArray[oldArray.length] = 4;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u4e2d\u600e\u4e48\u589e\u52a0\u6570\u7ec4\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>java \u4e2d\u589e\u52a0\u6570\u7ec4\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u4e09\u79cd\u65b9\u6cd5\u5b9e\u73b0\uff1a\u4f7f\u7528 arrays \u5de5\u5177\u7c7b\u4e2d\u7684 copyof() \u65b9\u6cd5\u8fdb\u884c\u6570\u7ec4\u6269\u5c55\u3002\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a arraylist \u6dfb\u52a0\u5143\u7d20\uff0c\u6700\u540e\u518d\u8f6c\u6362\u56de\u6570\u7ec4\u3002\u624b\u52a8\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\u5e76\u590d\u5236\u65e7\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff0c\u7136\u540e\u6dfb\u52a0\u65b0\u5143\u7d20\u3002 \u5982\u4f55\u5728 Java \u4e2d\u589e\u52a0\u6570\u7ec4 \u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528\u6570\u7ec4\u5de5\u5177\u7c7b Java \u4e2d\u63d0\u4f9b\u4e86 Arrays \u5de5\u5177\u7c7b\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u64cd\u4f5c\u6570\u7ec4\u3002\u8981\u589e\u52a0\u6570\u7ec4\uff0c\u53ef\u4ee5\u4f7f\u7528 copyOf() \u65b9\u6cd5\uff1a int[] oldArray = {1, 2, 3}; int[] newArray = Arrays.copyOf(oldArray, oldArray.length + 1); newArray[oldArray.length] = 4; \u767b\u5f55\u540e\u590d\u5236 \u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528 ArrayList \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u867d\u7136\u6570\u7ec4\u65e0\u6cd5\u76f4\u63a5\u589e\u52a0\uff0c\u4f46\u53ef\u4ee5\u5c06\u5176\u8f6c\u6362\u4e3a ArrayList\uff0c\u7136\u540e\u6dfb\u52a0\u5143\u7d20\u3002\u6700\u540e\u518d\u5c06\u5176\u8f6c\u6362\u4e3a\u6570\u7ec4\uff1a int[] oldArray = {1, 2, 3}; List&lt;Integer&gt; list = new ArrayList&lt;&gt;(Arrays.asList(oldArray)); list.add(4); int[] newArray = [&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-37953","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37953","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=37953"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37953\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=37953"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=37953"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=37953"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}