{"id":66042,"date":"2025-05-03T17:57:05","date_gmt":"2025-05-03T09:57:05","guid":{"rendered":"https:\/\/fwq.ai\/blog\/66042\/"},"modified":"2025-05-03T17:57:05","modified_gmt":"2025-05-03T09:57:05","slug":"java%e8%bf%94%e5%9b%9e%e6%95%b0%e7%bb%84%e6%80%8e%e4%b9%88%e8%bf%94%e5%9b%9e%e5%80%bc-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/66042\/","title":{"rendered":"java\u8fd4\u56de\u6570\u7ec4\u600e\u4e48\u8fd4\u56de\u503c"},"content":{"rendered":"

\n java \u8fd4\u56de\u6570\u7ec4\u7684\u65b9\u5f0f\u6709\u591a\u79cd\uff1a\u4f5c\u4e3a\u65b9\u6cd5\u53c2\u6570\u8fd4\u56de\u4f7f\u7528 collections.toarray() \u8f6c\u6362\u96c6\u5408\u4f7f\u7528 arrays.copyof() \u590d\u5236\u6570\u7ec4\u4f7f\u7528\u81ea\u5b9a\u4e49\u7c7b\u63d0\u4f9b toarray() \u65b9\u6cd5\n<\/p><\/blockquote>\n

\"java\u8fd4\u56de\u6570\u7ec4\u600e\u4e48\u8fd4\u56de\u503c\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u4f7f\u7528 Java \u8fd4\u56de\u6570\u7ec4<\/strong><\/p>\n

Java \u4e2d\u8fd4\u56de\u6570\u7ec4\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5177\u4f53\u53d6\u51b3\u4e8e\u6570\u7ec4\u7684\u7c7b\u578b\u548c\u8fd4\u56de\u65b9\u5f0f\u3002<\/p>\n

1. \u4f5c\u4e3a\u65b9\u6cd5\u53c2\u6570\u8fd4\u56de\u6570\u7ec4<\/strong><\/p>\n

public static int[] getArray() {\n    int[] arr = {1, 2, 3};\n    return arr;\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0cgetArray() \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5305\u542b {1, 2, 3} \u7684\u6574\u578b\u6570\u7ec4\u3002<\/p>\n
\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n
2. \u4f7f\u7528 Collections.toArray() \u8fd4\u56de\u6570\u7ec4<\/strong><\/p>\n
Collections.toArray() \u65b9\u6cd5\u5141\u8bb8\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u3002<\/p>\n
List<Integer> list = new ArrayList<>();\nlist.add(1);\nlist.add(2);\nlist.add(3);\n\nint[] arr = list.toArray(new int[0]);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u5c06 ArrayList \u8f6c\u6362\u4e3a\u4e00\u4e2a\u6574\u578b\u6570\u7ec4 arr\u3002<\/p>\n
3. \u4f7f\u7528 Arrays.copyOf() \u8fd4\u56de\u6570\u7ec4<\/strong><\/p>\n
Arrays.copyOf() \u65b9\u6cd5\u5141\u8bb8\u590d\u5236\u90e8\u5206\u6216\u6574\u4e2a\u6570\u7ec4\u3002<\/p>\n
int[] original = {1, 2, 3, 4, 5};\nint[] copy = Arrays.copyOf(original, 3);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u5c06 original \u6570\u7ec4\u7684\u524d\u4e09\u4e2a\u5143\u7d20\u590d\u5236\u5230\u4e00\u4e2a\u65b0\u6570\u7ec4 copy \u4e2d\u3002<\/p>\n
4. \u4f7f\u7528\u81ea\u5b9a\u4e49\u7c7b\u8fd4\u56de\u6570\u7ec4<\/strong><\/p>\n
\u5982\u679c\u9700\u8981\u8fd4\u56de\u81ea\u5b9a\u4e49\u7c7b\u7684\u6570\u7ec4\uff0c\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u7c7b\u5e76\u63d0\u4f9b\u4e00\u4e2a toArray() \u65b9\u6cd5\u3002<\/p>\n
public class MyClass {\n\n    private int[] data;\n\n    public MyClass(int[] data) {\n        this.data = data;\n    }\n\n    public int[] toArray() {\n        return data;\n    }\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u7136\u540e\uff0c\u53ef\u4ee5\u5728\u65b9\u6cd5\u4e2d\u4f7f\u7528\u6b64\u7c7b\u8fd4\u56de\u6570\u7ec4\u3002<\/p>\n
public static MyClass getArrayClass() {\n    MyClass myClass = new MyClass(new int[] {1, 2, 3});\n    return myClass;\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4ee5\u4e0a\u5c31\u662fjava\u8fd4\u56de\u6570\u7ec4\u600e\u4e48\u8fd4\u56de\u503c\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
java \u8fd4\u56de\u6570\u7ec4\u7684\u65b9\u5f0f\u6709\u591a\u79cd\uff1a\u4f5c\u4e3a\u65b9\u6cd5\u53c2\u6570\u8fd4\u56de\u4f7f\u7528 collections.toarray() \u8f6c\u6362\u96c6\u5408\u4f7f\u7528 arrays.copyof() \u590d\u5236\u6570\u7ec4\u4f7f\u7528\u81ea\u5b9a\u4e49\u7c7b\u63d0\u4f9b toarray() \u65b9\u6cd5 \u5982\u4f55\u4f7f\u7528 Java \u8fd4\u56de\u6570\u7ec4 Java \u4e2d\u8fd4\u56de\u6570\u7ec4\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5177\u4f53\u53d6\u51b3\u4e8e\u6570\u7ec4\u7684\u7c7b\u578b\u548c\u8fd4\u56de\u65b9\u5f0f\u3002 1. \u4f5c\u4e3a\u65b9\u6cd5\u53c2\u6570\u8fd4\u56de\u6570\u7ec4 public static int[] getArray() { int[] arr = {1, 2, 3}; return arr; } \u767b\u5f55\u540e\u590d\u5236 \u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0cgetArray() \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5305\u542b {1, 2, 3} \u7684\u6574\u578b\u6570\u7ec4\u3002 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b 2. \u4f7f\u7528 Collections.toArray() \u8fd4\u56de\u6570\u7ec4 Collections.toArray() \u65b9\u6cd5\u5141\u8bb8\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u3002 List<Integer> list = new ArrayList<>(); list.add(1); list.add(2); list.add(3); int[] arr = list.toArray(new […]<\/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-66042","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/66042","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=66042"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/66042\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=66042"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=66042"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=66042"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}