{"id":38295,"date":"2024-11-26T13:09:57","date_gmt":"2024-11-26T05:09:57","guid":{"rendered":"https:\/\/fwq.ai\/blog\/38295\/"},"modified":"2024-11-26T13:09:57","modified_gmt":"2024-11-26T05:09:57","slug":"%e6%80%8e%e4%b9%88%e5%88%9b%e5%bb%ba%e6%9c%aa%e7%9f%a5%e9%95%bf%e5%ba%a6%e7%9a%84%e6%95%b0%e7%bb%84java","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/38295\/","title":{"rendered":"\u600e\u4e48\u521b\u5efa\u672a\u77e5\u957f\u5ea6\u7684\u6570\u7ec4java"},"content":{"rendered":"

\n java \u4e2d\u521b\u5efa\u672a\u77e5\u957f\u5ea6\u6570\u7ec4\u7684\u65b9\u6cd5\uff1a1. \u4f7f\u7528 arraylist\uff0c\u8fd9\u662f\u4e00\u4e2a\u52a8\u6001\u8c03\u6574\u957f\u5ea6\u7684\u6570\u7ec4\uff1b2. \u4f7f\u7528 varargs\uff08\u53ef\u53d8\u53c2\u6570\uff09\uff0c\u5141\u8bb8\u4f20\u9012\u6570\u91cf\u4e0d\u786e\u5b9a\u7684\u53c2\u6570\u521b\u5efa\u6570\u7ec4\uff1b3. \u4f7f\u7528\u6570\u7ec4\u590d\u5236\uff0c\u5c06\u73b0\u6709\u6570\u7ec4\u590d\u5236\u5230\u957f\u5ea6\u4e0d\u540c\u7684\u65b0\u6570\u7ec4\u3002\u793a\u4f8b\u4ee3\u7801\uff1aarraylist list = new arraylist()\uff1bint[] varargsarray = {1, 2, 3}\uff1bint[] newarray = arrays.copyof(originalarray,\n<\/p><\/blockquote>\n

\"\u600e\u4e48\u521b\u5efa\u672a\u77e5\u957f\u5ea6\u7684\u6570\u7ec4java\u63d2\u56fe\"<\/p>\n

\u521b\u5efa\u672a\u77e5\u957f\u5ea6\u6570\u7ec4\u7684 Java \u65b9\u6cd5<\/strong><\/p>\n

\u5728 Java \u4e2d\uff0c\u6570\u7ec4\u662f\u5177\u6709\u56fa\u5b9a\u957f\u5ea6\u7684\u6570\u636e\u7ed3\u6784\uff0c\u8fd9\u610f\u5473\u7740\u5728\u521b\u5efa\u6570\u7ec4\u65f6\u5fc5\u987b\u6307\u5b9a\u5176\u5143\u7d20\u6570\u91cf\u3002\u7136\u800c\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6cd5\u521b\u5efa\u672a\u77e5\u957f\u5ea6\u7684\u6570\u7ec4\uff1a<\/p>\n

1. \u4f7f\u7528 ArrayList<\/strong><\/p>\n

ArrayList \u662f\u4e00\u4e2a\u52a8\u6001\u6570\u7ec4\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u7684\u957f\u5ea6\u53ef\u4ee5\u6839\u636e\u9700\u8981\u52a8\u6001\u8c03\u6574\u3002\u8981\u521b\u5efa ArrayList\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/p>\n

\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n

ArrayList<DataType> list = new ArrayList<>();<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u5176\u4e2d DataType \u4e3a\u8981\u5b58\u50a8\u5728\u6570\u7ec4\u4e2d\u7684\u6570\u636e\u7c7b\u578b\u3002<\/p>\n
2. \u4f7f\u7528 varargs<\/strong><\/p>\n
varargs\uff08\u53ef\u53d8\u53c2\u6570\uff09\u5141\u8bb8\u5728\u65b9\u6cd5\u4e2d\u4f20\u9012\u6570\u91cf\u4e0d\u786e\u5b9a\u7684\u53c2\u6570\u3002\u8981\u521b\u5efa varargs\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/p>\n
public static void method(DataType... args) {\n    \/\/ \u4f7f\u7528 args\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u5176\u4e2d DataType \u4e3a\u8981\u5b58\u50a8\u5728\u6570\u7ec4\u4e2d\u7684\u6570\u636e\u7c7b\u578b\u3002<\/p>\n
3. \u4f7f\u7528\u6570\u7ec4\u590d\u5236<\/strong><\/p>\n
\u4f7f\u7528\u6570\u7ec4\u590d\u5236\u53ef\u4ee5\u5c06\u73b0\u6709\u6570\u7ec4\u590d\u5236\u5230\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u65b0\u6570\u7ec4\u7684\u957f\u5ea6\u53ef\u4ee5\u4e0d\u540c\u4e8e\u539f\u59cb\u6570\u7ec4\u3002\u8981\u590d\u5236\u6570\u7ec4\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/p>\n
int[] newArray = Arrays.copyOf(originalArray, newLength);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u5176\u4e2d originalArray \u662f\u8981\u590d\u5236\u7684\u539f\u59cb\u6570\u7ec4\uff0cnewLength \u662f\u65b0\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/p>\n
\u793a\u4f8b\uff1a<\/strong><\/p>\n
import java.util.ArrayList;\n\npublic class UnknownLengthArray {\n\n    public static void main(String[] args) {\n        \/\/ \u4f7f\u7528 ArrayList \u521b\u5efa\u672a\u77e5\u957f\u5ea6\u6570\u7ec4\n        ArrayList<Integer> list = new ArrayList<>();\n        list.add(1);\n        list.add(2);\n        list.add(3);\n\n        \/\/ \u4f7f\u7528 varargs \u521b\u5efa\u672a\u77e5\u957f\u5ea6\u6570\u7ec4\n        int[] varargsArray = {1, 2, 3};\n\n        \/\/ \u4f7f\u7528\u6570\u7ec4\u590d\u5236\u521b\u5efa\u672a\u77e5\u957f\u5ea6\u6570\u7ec4\n        int[] originalArray = {1, 2, 3};\n        int[] newArray = Arrays.copyOf(originalArray, 5);\n\n        \/\/ \u6253\u5370\u6570\u7ec4\n        System.out.println(\"ArrayList: \" + list);\n        System.out.println(\"Varargs Array: \" + Arrays.toString(varargsArray));\n        System.out.println(\"New Array: \" + Arrays.toString(newArray));\n    }\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u600e\u4e48\u521b\u5efa\u672a\u77e5\u957f\u5ea6\u7684\u6570\u7ec4java\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":"
java \u4e2d\u521b\u5efa\u672a\u77e5\u957f\u5ea6\u6570\u7ec4\u7684\u65b9\u6cd5\uff1a1. \u4f7f\u7528 arraylist\uff0c\u8fd9\u662f\u4e00\u4e2a\u52a8\u6001\u8c03\u6574\u957f\u5ea6\u7684\u6570\u7ec4\uff1b2. \u4f7f\u7528 varargs\uff08\u53ef\u53d8\u53c2\u6570\uff09\uff0c\u5141\u8bb8\u4f20\u9012\u6570\u91cf\u4e0d\u786e\u5b9a\u7684\u53c2\u6570\u521b\u5efa\u6570\u7ec4\uff1b3. \u4f7f\u7528\u6570\u7ec4\u590d\u5236\uff0c\u5c06\u73b0\u6709\u6570\u7ec4\u590d\u5236\u5230\u957f\u5ea6\u4e0d\u540c\u7684\u65b0\u6570\u7ec4\u3002\u793a\u4f8b\u4ee3\u7801\uff1aarraylist list = new arraylist()\uff1bint[] varargsarray = {1, 2, 3}\uff1bint[] newarray = arrays.copyof(originalarray, \u521b\u5efa\u672a\u77e5\u957f\u5ea6\u6570\u7ec4\u7684 Java \u65b9\u6cd5 \u5728 Java \u4e2d\uff0c\u6570\u7ec4\u662f\u5177\u6709\u56fa\u5b9a\u957f\u5ea6\u7684\u6570\u636e\u7ed3\u6784\uff0c\u8fd9\u610f\u5473\u7740\u5728\u521b\u5efa\u6570\u7ec4\u65f6\u5fc5\u987b\u6307\u5b9a\u5176\u5143\u7d20\u6570\u91cf\u3002\u7136\u800c\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6cd5\u521b\u5efa\u672a\u77e5\u957f\u5ea6\u7684\u6570\u7ec4\uff1a 1. \u4f7f\u7528 ArrayList ArrayList \u662f\u4e00\u4e2a\u52a8\u6001\u6570\u7ec4\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u7684\u957f\u5ea6\u53ef\u4ee5\u6839\u636e\u9700\u8981\u52a8\u6001\u8c03\u6574\u3002\u8981\u521b\u5efa ArrayList\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b ArrayList<DataType> list = new ArrayList<>(); \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d DataType \u4e3a\u8981\u5b58\u50a8\u5728\u6570\u7ec4\u4e2d\u7684\u6570\u636e\u7c7b\u578b\u3002 2. \u4f7f\u7528 varargs varargs\uff08\u53ef\u53d8\u53c2\u6570\uff09\u5141\u8bb8\u5728\u65b9\u6cd5\u4e2d\u4f20\u9012\u6570\u91cf\u4e0d\u786e\u5b9a\u7684\u53c2\u6570\u3002\u8981\u521b\u5efa varargs\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a public static void method(DataType… args) { \/\/ \u4f7f\u7528 args […]<\/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-38295","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38295","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=38295"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38295\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=38295"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=38295"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=38295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}