{"id":37552,"date":"2024-11-26T17:05:05","date_gmt":"2024-11-26T09:05:05","guid":{"rendered":"https:\/\/fwq.ai\/blog\/37552\/"},"modified":"2024-11-26T17:05:05","modified_gmt":"2024-11-26T09:05:05","slug":"java%e6%95%b0%e7%bb%84%e6%80%8e%e4%b9%88%e4%b8%8d%e8%ae%be%e7%bd%ae%e9%95%bf%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/37552\/","title":{"rendered":"java\u6570\u7ec4\u600e\u4e48\u4e0d\u8bbe\u7f6e\u957f\u5ea6"},"content":{"rendered":"<blockquote><p>\n  \u5728 java \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u6cdb\u578b\u521b\u5efa\u4e00\u4e2a\u4e0d\u8bbe\u7f6e\u957f\u5ea6\u7684\u6570\u7ec4\u3002\u521b\u5efa\u6cdb\u578b\u6570\u7ec4\uff0c\u8bed\u6cd5\uff1at[] array = new t[0];\uff0c\u5176\u4e2d t \u4e3a\u6570\u7ec4\u5143\u7d20\u7684\u7c7b\u578b\u3002\u5411\u6cdb\u578b\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\uff0c\u4f1a\u81ea\u52a8\u6269\u5bb9\uff1aint[] newarray = arrays.copyof(array, array.length + 1);\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/13\/2024111307091869381.jpg\" class=\"aligncenter\" title=\"java\u6570\u7ec4\u600e\u4e48\u4e0d\u8bbe\u7f6e\u957f\u5ea6\u63d2\u56fe\" alt=\"java\u6570\u7ec4\u600e\u4e48\u4e0d\u8bbe\u7f6e\u957f\u5ea6\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u521b\u5efa\u4e0d\u8bbe\u7f6e\u957f\u5ea6\u7684 Java \u6570\u7ec4<\/strong><\/p>\n<p>\u5728 Java \u4e2d\uff0c\u6570\u7ec4\u7684\u957f\u5ea6\u5728\u521b\u5efa\u540e\u662f\u56fa\u5b9a\u7684\u3002\u4f46\u662f\uff0c\u53ef\u4ee5\u4f7f\u7528\u6cdb\u578b\u521b\u5efa\u4e00\u4e2a\u4e0d\u8bbe\u7f6e\u957f\u5ea6\u7684\u6570\u7ec4\u3002<\/p>\n<p><strong>\u4f7f\u7528\u6cdb\u578b\u6570\u7ec4<\/strong><\/p>\n<p>\u6cdb\u578b\u6570\u7ec4\u5141\u8bb8\u5728\u7f16\u8bd1\u65f6\u6307\u5b9a\u6570\u7ec4\u5143\u7d20\u7684\u7c7b\u578b\uff0c\u800c\u4e0d\u662f\u5728\u521b\u5efa\u65f6\u6307\u5b9a\u957f\u5ea6\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\u521b\u5efa\u6cdb\u578b\u6570\u7ec4\uff1a<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>T[] array = new T[0];<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5176\u4e2d T \u662f\u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u7c7b\u578b\u3002\u8fd9\u4e2a\u6570\u7ec4\u7684\u957f\u5ea6\u4e3a 0\uff0c\u4f46\u53ef\u4ee5\u52a8\u6001\u589e\u52a0\u3002<\/p>\n<p><strong>\u5411\u6cdb\u578b\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20<\/strong><\/p>\n<p>\u5411\u6cdb\u578b\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u65f6\uff0c\u6570\u7ec4\u4f1a\u81ea\u52a8\u6269\u5bb9\u3002\u53ef\u4ee5\u4f7f\u7528 Arrays.copyOf() \u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u957f\u5ea6\u6bd4\u539f\u6570\u7ec4\u957f 1\u3002<\/p>\n<pre>int[] array = {1, 2, 3}; \/\/ \u539f\u6570\u7ec4\nint[] newArray = Arrays.copyOf(array, array.length + 1); \/\/ \u65b0\u6570\u7ec4\uff0c\u957f\u5ea6\u4e3a\u539f\u6570\u7ec4\u957f\u5ea6 + 1\nnewArray[3] = 4; \/\/ \u5411\u65b0\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u8303\u4f8b<\/strong><\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u8303\u4f8b\uff0c\u6f14\u793a\u5982\u4f55\u5728\u4e0d\u8bbe\u7f6e\u957f\u5ea6\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\u6cdb\u578b\u6570\u7ec4\uff1a<\/p>\n<pre>import java.util.Arrays;\n\npublic class Main {\n    public static void main(String[] args) {\n        \/\/ \u521b\u5efa\u4e00\u4e2a\u4e0d\u8bbe\u7f6e\u957f\u5ea6\u7684\u6574\u6570\u6570\u7ec4\n        Integer[] array = new Integer[0];\n\n        \/\/ \u5411\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\n        array = Arrays.copyOf(array, array.length + 1);\n        array[0] = 1;\n\n        \/\/ \u7ee7\u7eed\u5411\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\n        array = Arrays.copyOf(array, array.length + 1);\n        array[1] = 2;\n\n        \/\/ \u6253\u5370\u6570\u7ec4\n        System.out.println(Arrays.toString(array)); \/\/ \u8f93\u51fa\uff1a[1, 2]\n    }\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u6570\u7ec4\u600e\u4e48\u4e0d\u8bbe\u7f6e\u957f\u5ea6\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\uff0c\u53ef\u4ee5\u4f7f\u7528\u6cdb\u578b\u521b\u5efa\u4e00\u4e2a\u4e0d\u8bbe\u7f6e\u957f\u5ea6\u7684\u6570\u7ec4\u3002\u521b\u5efa\u6cdb\u578b\u6570\u7ec4\uff0c\u8bed\u6cd5\uff1at[] array = new t[0];\uff0c\u5176\u4e2d t \u4e3a\u6570\u7ec4\u5143\u7d20\u7684\u7c7b\u578b\u3002\u5411\u6cdb\u578b\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\uff0c\u4f1a\u81ea\u52a8\u6269\u5bb9\uff1aint[] newarray = arrays.copyof(array, array.length + 1);\u3002 \u5982\u4f55\u521b\u5efa\u4e0d\u8bbe\u7f6e\u957f\u5ea6\u7684 Java \u6570\u7ec4 \u5728 Java \u4e2d\uff0c\u6570\u7ec4\u7684\u957f\u5ea6\u5728\u521b\u5efa\u540e\u662f\u56fa\u5b9a\u7684\u3002\u4f46\u662f\uff0c\u53ef\u4ee5\u4f7f\u7528\u6cdb\u578b\u521b\u5efa\u4e00\u4e2a\u4e0d\u8bbe\u7f6e\u957f\u5ea6\u7684\u6570\u7ec4\u3002 \u4f7f\u7528\u6cdb\u578b\u6570\u7ec4 \u6cdb\u578b\u6570\u7ec4\u5141\u8bb8\u5728\u7f16\u8bd1\u65f6\u6307\u5b9a\u6570\u7ec4\u5143\u7d20\u7684\u7c7b\u578b\uff0c\u800c\u4e0d\u662f\u5728\u521b\u5efa\u65f6\u6307\u5b9a\u957f\u5ea6\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\u521b\u5efa\u6cdb\u578b\u6570\u7ec4\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b T[] array = new T[0]; \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d T \u662f\u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u7c7b\u578b\u3002\u8fd9\u4e2a\u6570\u7ec4\u7684\u957f\u5ea6\u4e3a 0\uff0c\u4f46\u53ef\u4ee5\u52a8\u6001\u589e\u52a0\u3002 \u5411\u6cdb\u578b\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20 \u5411\u6cdb\u578b\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u65f6\uff0c\u6570\u7ec4\u4f1a\u81ea\u52a8\u6269\u5bb9\u3002\u53ef\u4ee5\u4f7f\u7528 Arrays.copyOf() \u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u957f\u5ea6\u6bd4\u539f\u6570\u7ec4\u957f 1\u3002 int[] array = {1, 2, 3}; \/\/ \u539f\u6570\u7ec4 int[] newArray = Arrays.copyOf(array, array.length + 1); \/\/ [&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-37552","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37552","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=37552"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37552\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=37552"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=37552"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=37552"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}