{"id":613,"date":"2024-11-08T02:00:08","date_gmt":"2024-11-07T18:00:08","guid":{"rendered":"https:\/\/www.ikaros.love\/?p=613"},"modified":"2024-11-08T02:00:08","modified_gmt":"2024-11-07T18:00:08","slug":"java%e6%b7%b1%e6%8b%b7%e8%b4%9d%e5%92%8c%e6%b5%85%e6%8b%b7%e8%b4%9d","status":"publish","type":"post","link":"https:\/\/www.ikaros.love\/?p=613","title":{"rendered":"java\u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

\u642c\u8fd0\u81ea<\/p>\n\n\n\n

\u6df1\u5165\u7406\u89e3Java\u6d45\u62f7\u8d1d\u4e0e\u6df1\u62f7\u8d1d | \u4e8c\u54e5\u7684Java\u8fdb\u9636\u4e4b\u8def<\/a><\/p>\n\n\n\n

\u201c\u54e5\uff0c\u542c\u8bf4\u6d45\u62f7\u8d1d\u548c\u6df1\u62f7\u8d1d\u662f Java \u9762\u8bd5\u4e2d\u7ecf\u5e38\u4f1a\u88ab\u95ee\u5230\u7684\u4e00\u4e2a\u95ee\u9898\uff0c\u662f\u8fd9\u6837\u5417\uff1f\u201d<\/p>\n\n\n\n

\u201c\u8fd8\u771f\u7684\u662f\uff0c\u800c\u4e14\u4e86\u89e3\u6d45\u62f7\u8d1d\u548c\u6df1\u62f7\u8d1d\u7684\u539f\u7406\uff0c\u5bf9 Java \u662f\u503c\u4f20\u9012\u8fd8\u662f\u5f15\u7528\u4f20\u9012<\/a>\u4e5f\u4f1a\u6709\u66f4\u6df1\u7684\u7406\u89e3\u3002\u201d\u6211\u80af\u5b9a\u5730\u56de\u7b54\u3002<\/p>\n\n\n\n

\u201c\u4e0d\u7ba1\u662f\u6d45\u62f7\u8d1d\u8fd8\u662f\u6df1\u62f7\u8d1d\uff0c\u90fd\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528 Object \u7c7b\u7684 clone()<\/code> \u65b9\u6cd5\u6765\u5b8c\u6210\u3002\u201d\u6211\u4e00\u8fb9\u8bf4\uff0c\u4e00\u8fb9\u6253\u5f00 Intellij IDEA\uff0c\u5e76\u627e\u5230\u4e86 clone()<\/code> \u65b9\u6cd5\u7684\u6e90\u7801\u3002<\/p>\n\n\n\n

protected native Object clone() throws CloneNotSupportedException;<\/code><\/pre>\n\n\n\n
\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cclone()<\/code> \u65b9\u6cd5\u540c\u65f6\u662f\u4e00\u4e2a\u672c\u5730\uff08native<\/code>\uff09\u65b9\u6cd5\uff0c\u5b83\u7684\u5177\u4f53\u5b9e\u73b0\u4f1a\u4ea4\u7ed9 HotSpot \u865a\u62df\u673a\uff0c\u90a3\u5c31\u610f\u5473\u7740\u865a\u62df\u673a\u5728\u8fd0\u884c\u8be5\u65b9\u6cd5\u7684\u65f6\u5019\uff0c\u4f1a\u5c06\u5176\u66ff\u6362\u4e3a\u66f4\u9ad8\u6548\u7684 C\/C++ \u4ee3\u7801\uff0c\u8fdb\u800c\u8c03\u7528\u64cd\u4f5c\u7cfb\u7edf\u53bb\u5b8c\u6210\u5bf9\u8c61\u7684\u514b\u9686\u5de5\u4f5c\u3002<\/p>\n\n\n\n
\n
Java 9 \u540e\uff0c\u8be5\u65b9\u6cd5\u4f1a\u88ab\u6807\u6ce8 @HotSpotIntrinsicCandidate<\/code> \u6ce8\u89e3\uff0c\u88ab\u8be5\u6ce8\u89e3\u6807\u6ce8\u7684\u65b9\u6cd5\uff0c\u5728 HotSpot \u865a\u62df\u673a\u4e2d\u4f1a\u6709\u4e00\u5957\u9ad8\u6548\u7684\u5b9e\u73b0\u3002<\/p>\n<\/blockquote>\n\n\n\n
\u201c\u54e5\uff0c\u90a3\u4f60\u5c31\u5148\u8bf4\u6d45\u62f7\u8d1d\u5427\uff01\u201d<\/p>\n\n\n\n
\u201c\u597d\u7684\u5440\u3002\u76f4\u63a5\u4e0a\u5b9e\u6218\u4ee3\u7801\u3002\u201d<\/p>\n\n\n\n
class Writer implements Cloneable{\n    private int age;\n    private String name;\n\n    \/\/ getter\/setter \u548c\u6784\u9020\u65b9\u6cd5\u90fd\u5df2\u7701\u7565\n\n    @Override\n    public String toString() {\n        return super.toString().substring(26) + \"{\" +\n                \"age=\" + age +\n                \", name='\" + name + '\\'' +\n                '}';\n    }\n}<\/code><\/pre>\n\n\n\n
Writer \u7c7b\u6709\u4e24\u4e2a\u5b57\u6bb5\uff0c\u5206\u522b\u662f int \u7c7b\u578b\u7684 age\uff0c\u548c String \u7c7b\u578b\u7684 name\u3002\u7136\u540e\u91cd\u5199\u4e86 toString()<\/code> \u65b9\u6cd5\uff0c\u65b9\u4fbf\u6253\u5370\u5bf9\u8c61\u7684\u5177\u4f53\u4fe1\u606f\u3002<\/p>\n\n\n\n
\u201c\u4e3a\u4ec0\u4e48\u8981\u5b9e\u73b0 Cloneable \u63a5\u53e3\u5462\uff1f\u201d\u4e09\u59b9\u5f00\u542f\u4e86\u5341\u4e07\u4e2a\u4e3a\u4ec0\u4e48\u7684\u6a21\u5f0f\u3002<\/p>\n\n\n\n
Cloneable \u63a5\u53e3\u662f\u4e00\u4e2a\u6807\u8bb0\u63a5\u53e3\uff0c\u5b83\u809a\u5b50\u91cc\u9762\u662f\u7a7a\u7684\uff1a<\/p>\n\n\n\n
public interface Cloneable {\n}<\/code><\/pre>\n\n\n\n
\u53ea\u662f\uff0c\u5982\u679c\u4e00\u4e2a\u7c7b\u6ca1\u6709\u5b9e\u73b0 Cloneable \u63a5\u53e3\uff0c\u5373\u4fbf\u5b83\u91cd\u5199\u4e86 clone()<\/code> \u65b9\u6cd5\uff0c\u4f9d\u7136\u662f\u65e0\u6cd5\u8c03\u7528\u8be5\u65b9\u6cd5\u8fdb\u884c\u5bf9\u8c61\u514b\u9686\u7684\uff0c\u7a0b\u5e8f\u5728\u6267\u884c clone()<\/code> \u65b9\u6cd5\u7684\u65f6\u5019\u4f1a\u629b\u51fa CloneNotSupportedException \u5f02\u5e38\u3002<\/p>\n\n\n\n
Exception in thread \"main\" java.lang.CloneNotSupportedException<\/code><\/pre>\n\n\n\n
\u6807\u8bb0\u63a5\u53e3\u7684\u4f5c\u7528\u5176\u5b9e\u5f88\u7b80\u5355\uff0c\u7528\u6765\u8868\u793a\u67d0\u4e2a\u529f\u80fd\u5728\u6267\u884c\u7684\u65f6\u5019\u662f\u5408\u6cd5\u7684\u3002<\/p>\n\n\n\n
\u201c\u54e6\uff0c\u6211\u609f\u4e86\uff01\u201d\u4e09\u59b9\u770b\u6765\u662f\u5f7b\u5e95\u660e\u767d\u4e86\u6211\u8bf4\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n
\u201c\u63a5\u7740\uff0c\u6765\u6d4b\u8bd5\u7c7b\u3002\u201d<\/p>\n\n\n\n
class TestClone {\n    public static void main(String[] args) throws CloneNotSupportedException {\n        Writer writer1 = new Writer(18,\"\u4e8c\u54e5\");\n        Writer writer2 = (Writer) writer1.clone();\n\n        System.out.println(\"\u6d45\u62f7\u8d1d\u540e\uff1a\");\n        System.out.println(\"writer1\uff1a\" + writer1);\n        System.out.println(\"writer2\uff1a\" + writer2);\n\n        writer2.setName(\"\u4e09\u59b9\");\n\n        System.out.println(\"\u8c03\u6574\u4e86 writer2 \u7684 name \u540e\uff1a\");\n        System.out.println(\"writer1\uff1a\" + writer1);\n        System.out.println(\"writer2\uff1a\" + writer2);\n    }\n}<\/code><\/pre>\n\n\n\n