{"id":36833,"date":"2024-11-26T16:28:07","date_gmt":"2024-11-26T08:28:07","guid":{"rendered":"https:\/\/fwq.ai\/blog\/36833\/"},"modified":"2024-11-26T16:28:07","modified_gmt":"2024-11-26T08:28:07","slug":"java%e6%80%8e%e4%b9%88%e6%b7%bb%e5%8a%a0%e8%bf%9b%e6%95%b0%e7%bb%84","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/36833\/","title":{"rendered":"java\u600e\u4e48\u6dfb\u52a0\u8fdb\u6570\u7ec4"},"content":{"rendered":"<blockquote><p>\n  \u5728 java \u4e2d\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u6570\u7ec4\u7684\u65b9\u6cd5\u5305\u62ec\uff1a\u76f4\u63a5\u8d4b\u503c\u4f7f\u7528 arrays.copyof()\u4f7f\u7528 system.arraycopy()\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6570\u7ec4\uff0c\u4f7f\u7528 collections.addall()\u4f7f\u7528\u6d41\u5f0f api\uff08java 8+\uff09\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/12\/2024111220002535336.jpg\" class=\"aligncenter\" title=\"java\u600e\u4e48\u6dfb\u52a0\u8fdb\u6570\u7ec4\u63d2\u56fe\" alt=\"java\u600e\u4e48\u6dfb\u52a0\u8fdb\u6570\u7ec4\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u5728 Java \u4e2d\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u6570\u7ec4<\/strong><\/p>\n<p><strong>\u76f4\u63a5\u8d4b\u503c<\/strong><\/p>\n<p>\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 [] \u8fd0\u7b97\u7b26\u76f4\u63a5\u5411\u6570\u7ec4\u4e2d\u7684\u7279\u5b9a\u7d22\u5f15\u5904\u8d4b\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>int[] arr = new int[5];\narr[0] = 10;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4f7f\u7528 Arrays.copyOf()<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p>Arrays.copyOf() \u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5e76\u5c06\u73b0\u6709\u6570\u7ec4\u7684\u5185\u5bb9\u590d\u5236\u5230\u5176\u4e2d\uff0c\u7136\u540e\u9644\u52a0\u65b0\u7684\u5143\u7d20\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>int[] arr1 = {10, 20, 30};\nint[] arr2 = Arrays.copyOf(arr1, arr1.length + 1);\narr2[arr2.length - 1] = 40;  \/\/ \u6dfb\u52a0\u65b0\u5143\u7d2040<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4f7f\u7528 System.arraycopy()<\/strong><\/p>\n<p>System.arraycopy() \u65b9\u6cd5\u5c06\u4e00\u4e2a\u6570\u7ec4\u7684\u5143\u7d20\u590d\u5236\u5230\u53e6\u4e00\u4e2a\u6570\u7ec4\u4e2d\u3002\u5b83\u5141\u8bb8\u60a8\u6307\u5b9a\u76ee\u6807\u6570\u7ec4\u7684\u8d77\u59cb\u7d22\u5f15\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>int[] arr1 = {10, 20, 30};\nint[] arr2 = new int[arr1.length + 1];\nSystem.arraycopy(arr1, 0, arr2, 0, arr1.length);\narr2[arr2.length - 1] = 40;  \/\/ \u6dfb\u52a0\u65b0\u5143\u7d2040<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4f7f\u7528 Collections.addAll()<\/strong><\/p>\n<p>\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6570\u7ec4\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 java.util.Collections.addAll() \u65b9\u6cd5\u5c06\u591a\u4e2a\u5143\u7d20\u4e00\u6b21\u6027\u6dfb\u52a0\u5230\u6570\u7ec4\u4e2d\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>import java.util.Collections;\n\nint[] arr = new int[5];\nCollections.addAll(arr, 10, 20, 30, 40, 50);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4f7f\u7528\u6d41\u5f0f API\uff08Java 8+\uff09<\/strong><\/p>\n<p>Java 8 \u5f15\u5165\u4e86\u6d41\u5f0f API\uff0c\u5b83\u5141\u8bb8\u4f7f\u7528\u66f4\u7b80\u6d01\u7684\u8bed\u6cd5\u6765\u64cd\u7eb5\u6570\u636e\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528 Stream.of() \u521b\u5efa\u4e00\u4e2a\u6d41\uff0c\u7136\u540e\u4f7f\u7528 Stream.concat() \u5c06\u5176\u9644\u52a0\u5230\u6570\u7ec4\u4e2d\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>import java.util.Arrays;\nimport java.util.stream.Stream;\n\nint[] arr = Stream.concat(Arrays.stream(arr1), Stream.of(40)).toArray();<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u6dfb\u52a0\u8fdb\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>\u5728 java \u4e2d\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u6570\u7ec4\u7684\u65b9\u6cd5\u5305\u62ec\uff1a\u76f4\u63a5\u8d4b\u503c\u4f7f\u7528 arrays.copyof()\u4f7f\u7528 system.arraycopy()\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6570\u7ec4\uff0c\u4f7f\u7528 collections.addall()\u4f7f\u7528\u6d41\u5f0f api\uff08java 8+\uff09 \u5982\u4f55\u5728 Java \u4e2d\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u6570\u7ec4 \u76f4\u63a5\u8d4b\u503c \u6700\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 [] \u8fd0\u7b97\u7b26\u76f4\u63a5\u5411\u6570\u7ec4\u4e2d\u7684\u7279\u5b9a\u7d22\u5f15\u5904\u8d4b\u503c\u3002\u4f8b\u5982\uff1a int[] arr = new int[5]; arr[0] = 10; \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528 Arrays.copyOf() \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b Arrays.copyOf() \u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5e76\u5c06\u73b0\u6709\u6570\u7ec4\u7684\u5185\u5bb9\u590d\u5236\u5230\u5176\u4e2d\uff0c\u7136\u540e\u9644\u52a0\u65b0\u7684\u5143\u7d20\u3002\u4f8b\u5982\uff1a int[] arr1 = {10, 20, 30}; int[] arr2 = Arrays.copyOf(arr1, arr1.length + 1); arr2[arr2.length &#8211; 1] = 40; \/\/ \u6dfb\u52a0\u65b0\u5143\u7d2040 \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528 System.arraycopy() System.arraycopy() \u65b9\u6cd5\u5c06\u4e00\u4e2a\u6570\u7ec4\u7684\u5143\u7d20\u590d\u5236\u5230\u53e6\u4e00\u4e2a\u6570\u7ec4\u4e2d\u3002\u5b83\u5141\u8bb8\u60a8\u6307\u5b9a\u76ee\u6807\u6570\u7ec4\u7684\u8d77\u59cb\u7d22\u5f15\u3002\u4f8b\u5982\uff1a int[] [&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-36833","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/36833","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=36833"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/36833\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=36833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=36833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=36833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}