{"id":39620,"date":"2024-11-26T14:11:16","date_gmt":"2024-11-26T06:11:16","guid":{"rendered":"https:\/\/fwq.ai\/blog\/39620\/"},"modified":"2024-11-26T14:11:16","modified_gmt":"2024-11-26T06:11:16","slug":"java%e6%80%8e%e4%b9%88%e6%8a%8a%e9%9b%86%e5%90%88%e8%bd%ac%e6%8d%a2%e4%b8%ba%e6%95%b0%e7%bb%84%e4%b8%ad","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/39620\/","title":{"rendered":"java\u600e\u4e48\u628a\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u4e2d"},"content":{"rendered":"<blockquote><p>\n  \u5728 java \u4e2d\uff0c\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u7684\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528 toarray() \u65b9\u6cd5\u76f4\u63a5\u8f6c\u6362\u4f7f\u7528 for-each \u5faa\u73af\u904d\u5386\u5143\u7d20\u5e76\u6dfb\u52a0\u5230\u6570\u7ec4\u4e2d\u4f7f\u7528 collectors \u7c7b\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u5217\u8868\uff0c\u7136\u540e\u4f7f\u7528 toarray() \u65b9\u6cd5\u8f6c\u6362\u4e3a\u6570\u7ec4\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/16\/2024111618573435937.jpg\" class=\"aligncenter\" title=\"java\u600e\u4e48\u628a\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u4e2d\u63d2\u56fe\" alt=\"java\u600e\u4e48\u628a\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u4e2d\u63d2\u56fe\" \/><\/p>\n<h2>\u5982\u4f55\u5c06 Java \u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4<\/h2>\n<p>\u5728 Java \u4e2d\uff0c\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6cd5\uff1a<\/p>\n<p><strong>1. \u4f7f\u7528 toArray() \u65b9\u6cd5<\/strong><\/p>\n<p>toArray() \u65b9\u6cd5\u662f\u96c6\u5408\u7c7b\u4e2d\u7684\u5185\u7f6e\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5c06\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u8f6c\u6362\u4e3a\u6570\u7ec4\u3002\u8be5\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u4e0e\u96c6\u5408\u4e2d\u5143\u7d20\u7c7b\u578b\u76f8\u540c\u7684\u6570\u7ec4\u3002<\/p>\n<pre>List&lt;String&gt; names = List.of(\"John\", \"Mary\", \"Bob\");\nString[] namesArray = names.toArray(new String[names.size()]);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>2. \u4f7f\u7528 for-each \u5faa\u73af<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528 for-each \u5faa\u73af\u904d\u5386\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u5e76\u5c06\u5176\u6dfb\u52a0\u5230\u6570\u7ec4\u4e2d\u3002<\/p>\n<pre>List&lt;Integer&gt; numbers = List.of(1, 2, 3, 4, 5);\nint[] numbersArray = new int[numbers.size()];\nint index = 0;\nfor (int number : numbers) {\n    numbersArray[index++] = number;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>3. \u4f7f\u7528 Collectors \u7c7b<\/strong><\/p>\n<p>Collectors \u7c7b\u4e2d\u63d0\u4f9b\u4e86\u4e00\u4e2a toList() \u65b9\u6cd5\uff0c\u53ef\u4ee5\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u5217\u8868\u3002\u7136\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528 toArray() \u65b9\u6cd5\u5c06\u5217\u8868\u8f6c\u6362\u4e3a\u6570\u7ec4\u3002<\/p>\n<pre>List&lt;String&gt; names = List.of(\"John\", \"Mary\", \"Bob\");\nString[] namesArray = names.stream()\n    .collect(Collectors.toList())\n    .toArray(new String[names.size()]);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5<\/strong><\/p>\n<p>\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u96c6\u5408\u7684\u5927\u5c0f\u548c\u6027\u80fd\u8981\u6c42\u3002\u5bf9\u4e8e\u8f83\u5c0f\u7684\u96c6\u5408\uff0ctoArray() \u65b9\u6cd5\u901a\u5e38\u662f\u6700\u7b80\u5355\u7684\u9009\u62e9\u3002\u5bf9\u4e8e\u8f83\u5927\u7684\u96c6\u5408\uff0c\u4f7f\u7528 for-each \u5faa\u73af\u6216 Collectors \u7c7b\u53ef\u4ee5\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u628a\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u4e2d\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\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u7684\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528 toarray() \u65b9\u6cd5\u76f4\u63a5\u8f6c\u6362\u4f7f\u7528 for-each \u5faa\u73af\u904d\u5386\u5143\u7d20\u5e76\u6dfb\u52a0\u5230\u6570\u7ec4\u4e2d\u4f7f\u7528 collectors \u7c7b\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u5217\u8868\uff0c\u7136\u540e\u4f7f\u7528 toarray() \u65b9\u6cd5\u8f6c\u6362\u4e3a\u6570\u7ec4 \u5982\u4f55\u5c06 Java \u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4 \u5728 Java \u4e2d\uff0c\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6cd5\uff1a 1. \u4f7f\u7528 toArray() \u65b9\u6cd5 toArray() \u65b9\u6cd5\u662f\u96c6\u5408\u7c7b\u4e2d\u7684\u5185\u7f6e\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5c06\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u8f6c\u6362\u4e3a\u6570\u7ec4\u3002\u8be5\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u4e0e\u96c6\u5408\u4e2d\u5143\u7d20\u7c7b\u578b\u76f8\u540c\u7684\u6570\u7ec4\u3002 List&lt;String&gt; names = List.of(&#8220;John&#8221;, &#8220;Mary&#8221;, &#8220;Bob&#8221;); String[] namesArray = names.toArray(new String[names.size()]); \u767b\u5f55\u540e\u590d\u5236 2. \u4f7f\u7528 for-each \u5faa\u73af \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u53ef\u4ee5\u4f7f\u7528 for-each \u5faa\u73af\u904d\u5386\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u5e76\u5c06\u5176\u6dfb\u52a0\u5230\u6570\u7ec4\u4e2d\u3002 List&lt;Integer&gt; numbers = List.of(1, 2, 3, 4, 5); int[] numbersArray = new [&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-39620","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39620","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=39620"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39620\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=39620"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=39620"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=39620"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}