{"id":91,"date":"2015-03-30T11:48:44","date_gmt":"2015-03-30T03:48:44","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=91"},"modified":"2026-08-18T12:09:25","modified_gmt":"2026-08-18T04:09:25","slug":"java-this%e5%85%b3%e9%94%ae%e5%ad%97%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=91","title":{"rendered":"Java this\u5173\u952e\u5b57\u8be6\u89e3"},"content":{"rendered":"
\n

this<\/code> \u7528\u6765\u8868\u793a\u5f53\u524d\u5bf9\u8c61<\/strong>\uff1a\u54ea\u4e2a\u5b9e\u4f8b\u6b63\u5728\u6267\u884c\u8fd9\u6bb5\u4ee3\u7801\uff0cthis<\/code> \u5c31\u6307\u5411\u8c01\u3002\u901a\u8fc7\u5b83\u53ef\u4ee5\u8bbf\u95ee\u672c\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\u548c\u5b9e\u4f8b\u65b9\u6cd5\u3002<\/p>\n

this<\/code> \u53ea\u5728\u5b9e\u4f8b\u5316\u4e4b\u540e\u624d\u6709\u610f\u4e49\uff0c\u9759\u6001\u65b9\u6cd5\u91cc\u6ca1\u6709\u5f53\u524d\u5bf9\u8c61\uff0c\u56e0\u6b64\u4e0d\u80fd\u7528 this<\/code>\u3002<\/p>\n

<\/p>\n

\u5e38\u89c1\u7528\u6cd5\u53ef\u4ee5\u5148\u653e\u5728\u4e00\u5f20\u8868\u91cc\u5bf9\u7167\uff1a<\/p>\n\n\n\n\n\n\n\n\n
\u5199\u6cd5<\/th>\n\u542b\u4e49<\/th>\n\u6ce8\u610f<\/th>\n<\/tr>\n<\/thead>\n
this.\u6210\u5458<\/td>\n\u8bbf\u95ee\u5f53\u524d\u5bf9\u8c61\u7684\u5b57\u6bb5\u6216\u65b9\u6cd5<\/td>\n\u6ca1\u6709\u91cd\u540d\u65f6\u53ef\u4ee5\u7701\u7565<\/td>\n<\/tr>\n
this.x = x<\/td>\n\u5f62\u53c2\u4e0e\u6210\u5458\u540c\u540d\u65f6\uff0c\u533a\u5206\u5f00<\/td>\n\u5de6\u8fb9\u662f\u6210\u5458\uff0c\u53f3\u8fb9\u662f\u5c40\u90e8\u53d8\u91cf<\/td>\n<\/tr>\n
this(\u2026)<\/td>\n\u5728\u6784\u9020\u65b9\u6cd5\u91cc\u8c03\u7528\u672c\u7c7b\u53e6\u4e00\u4e2a\u6784\u9020\u65b9\u6cd5<\/td>\n\u5fc5\u987b\u5199\u5728\u7b2c\u4e00\u53e5\uff1b\u4e0d\u80fd\u548c super() \u540c\u65f6\u51fa\u73b0<\/td>\n<\/tr>\n
\u65b9\u6cd5(this)<\/td>\n\u628a\u5f53\u524d\u5bf9\u8c61\u5f15\u7528\u4f20\u7ed9\u522b\u7684\u65b9\u6cd5<\/td>\n\u5e38\u7528\u4e8e\u56de\u8c03\u3001\u4e92\u76f8\u6301\u6709\u5f15\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e00\u3001\u6307\u5411\u5f53\u524d\u5b9e\u4f8b<\/h2>\n

\u4e0b\u9762 obj<\/code> \u662f Demo<\/code> \u7684\u4e00\u4e2a\u5b9e\u4f8b\u3002\u6267\u884c obj.sum()<\/code> \u65f6\uff0c\u65b9\u6cd5\u91cc\u7684 this<\/code> \u5c31\u548c obj<\/code> \u6307\u5411\u540c\u4e00\u4e2a\u5bf9\u8c61\uff1athis.x + this.y<\/code> \u7b49\u4ef7\u4e8e obj.x + obj.y<\/code>\u3002<\/p>\n

public class Demo {\n    public int x = 10;\n    public int y = 15;\n    public void sum() {\n        int z = this.x + this.y;\n        System.out.println(\"x + y = \" + z);\n    }\n    public static void main(String[] args) {\n        Demo obj = new Demo();\n        obj.sum();\n    }\n}<\/code><\/pre>\n
\u8fd0\u884c\u7ed3\u679c\uff1ax + y = 25<\/code>\u3002\u6ca1\u6709\u91cd\u540d\u65f6\uff0c\u5199\u6210 x + y<\/code> \u4e5f\u884c\uff0c\u7f16\u8bd1\u5668\u4f1a\u9ed8\u8ba4\u628a\u6210\u5458\u548c this<\/code> \u7ed1\u5728\u4e00\u8d77\u3002<\/p>\n
\u4e8c\u3001\u533a\u5206\u540c\u540d\u53d8\u91cf<\/h2>\n
\u5f62\u53c2\u4f5c\u7528\u57df\u662f\u6574\u4e2a\u65b9\u6cd5\u4f53\uff0c\u5c5e\u4e8e\u5c40\u90e8\u53d8\u91cf\u3002\u6784\u9020\u65b9\u6cd5\u91cc\u5f62\u53c2\u548c\u6210\u5458\u540c\u540d\u65f6\uff0c\u76f4\u63a5\u5199 name<\/code> \u8bbf\u95ee\u5230\u7684\u662f\u5f62\u53c2\uff1b\u8981\u7ed9\u6210\u5458\u8d4b\u503c\uff0c\u5fc5\u987b\u5199 this.name<\/code>\u3002<\/p>\n
public class Demo {\n    public String name;\n    public int age;\n    public Demo(String name, int age) {\n        this.name = name;\n        this.age = age;\n    }\n    public void say() {\n        System.out.println(\"\u7f51\u7ad9\u7684\u540d\u5b57\u662f\" + name + \"\uff0c\u5df2\u7ecf\u6210\u7acb\u4e86\" + age + \"\u5e74\");\n    }\n    public static void main(String[] args) {\n        Demo obj = new Demo(\"\u65b0\u534e\u82d1\", 3);\n        obj.say();\n    }\n}<\/code><\/pre>\n
\u8fd0\u884c\u7ed3\u679c\uff1a\u7f51\u7ad9\u7684\u540d\u5b57\u662f\u65b0\u534e\u82d1\uff0c\u5df2\u7ecf\u6210\u7acb\u4e863\u5e74<\/code>\u3002say()<\/code> \u91cc\u6ca1\u6709\u540c\u540d\u5c40\u90e8\u53d8\u91cf\uff0c\u5199 name<\/code> \u6216 this.name<\/code> \u6548\u679c\u76f8\u540c\u3002<\/p>\n
\u4e09\u3001\u5728\u6784\u9020\u65b9\u6cd5\u91cc\u8c03\u7528\u53e6\u4e00\u4e2a\u6784\u9020\u65b9\u6cd5<\/h2>\n
this(\u53c2\u6570)<\/code> \u4e0d\u662f\u666e\u901a\u65b9\u6cd5\u8c03\u7528\uff0c\u800c\u662f\u6784\u9020\u65b9\u6cd5\u94fe\u5f0f\u8c03\u7528<\/strong>\uff1a\u8ba9\u65e0\u53c2\u6784\u9020\u628a\u5de5\u4f5c\u8f6c\u4ea4\u7ed9\u6709\u53c2\u6784\u9020\u3002\u5b83\u5fc5\u987b\u4f5c\u4e3a\u6784\u9020\u65b9\u6cd5\u7684\u7b2c\u4e00\u53e5\u3002<\/p>\n
public class Demo {\n    public String name;\n    public int age;\n    public Demo() {\n        this(\"\u65b0\u534e\u82d1\", 3);\n    }\n    public Demo(String name, int age) {\n        this.name = name;\n        this.age = age;\n    }\n    public void say() {\n        System.out.println(\"\u7f51\u7ad9\u7684\u540d\u5b57\u662f\" + name + \"\uff0c\u5df2\u7ecf\u6210\u7acb\u4e86\" + age + \"\u5e74\");\n    }\n    public static void main(String[] args) {\n        Demo obj = new Demo();\n        obj.say();\n    }\n}<\/code><\/pre>\n
\u8fd0\u884c\u7ed3\u679c\u540c\u6837\u662f\uff1a\u7f51\u7ad9\u7684\u540d\u5b57\u662f\u65b0\u534e\u82d1\uff0c\u5df2\u7ecf\u6210\u7acb\u4e863\u5e74\u3002\u4e09\u6761\u786c\u89c4\u5219\uff1a<\/p>\n
    \n
  • \n
    \u8c03\u7528\u5fc5\u987b\u653e\u5728\u6784\u9020\u65b9\u6cd5\u6700\u8d77\u59cb\u7684\u4f4d\u7f6e\u3002<\/section>\n<\/li>\n
  • \n
    \u4e0d\u80fd\u5728\u6784\u9020\u65b9\u6cd5\u4ee5\u5916\u8c03\u7528\u6784\u9020\u65b9\u6cd5\uff08\u4e0d\u80fd\u5199 this()<\/code> \u5f53\u666e\u901a\u65b9\u6cd5\u7528\uff09\u3002<\/section>\n<\/li>\n
  • \n
    \u4e00\u4e2a\u6784\u9020\u65b9\u6cd5\u91cc\u53ea\u80fd\u8c03\u7528\u4e00\u4e2a\u6784\u9020\u65b9\u6cd5\uff1bthis()<\/code> \u548c super()<\/code> \u4e0d\u80fd\u540c\u65f6\u51fa\u73b0\u3002<\/section>\n<\/li>\n<\/ul>\n
    \u4e0a\u9762\u7528\u5230\u4e86\u65b9\u6cd5\u91cd\u8f7d\uff1a\u540c\u540d\u65b9\u6cd5\u53ea\u8981\u53c2\u6570\u5217\u8868\u4e0d\u540c\u5c31\u53ef\u4ee5\u5171\u5b58\uff0c\u540e\u7eed\u7ae0\u8282\u4f1a\u5c55\u5f00\u3002<\/p>\n
    \u56db\u3001\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012<\/h2>\n
    \u9700\u8981\u628a\u5f53\u524d\u5bf9\u8c61\u4ea4\u7ed9\u53e6\u4e00\u4e2a\u5b8c\u5168\u72ec\u7acb\u7684\u7c7b\u65f6\uff0c\u628a this<\/code> \u5f53\u4f5c\u53c2\u6570\u5373\u53ef\u3002<\/p>\n
    public class Demo {\n    public static void main(String[] args) {\n        new A();\n    }\n}\nclass A {\n    public A() {\n        new B(this).print();  \/\/ \u533f\u540d\u5bf9\u8c61\n    }\n    public void print() {\n        System.out.println(\"Hello from A!\");\n    }\n}\nclass B {\n    A a;\n    public B(A a) {\n        this.a = a;\n    }\n    public void print() {\n        a.print();\n        System.out.println(\"Hello from B!\");\n    }\n}<\/code><\/pre>\n
    \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
    Hello from A!\nHello from B!<\/code><\/pre>\n
    \u533f\u540d\u5bf9\u8c61\u5c31\u662f\u6ca1\u6709\u540d\u5b57\u7684\u5bf9\u8c61\u3002\u53ea\u7528\u4e00\u6b21\u65f6\uff0cnew B(this).print()<\/code> \u7b49\u4ef7\u4e8e\u5148 new B(this)<\/code> \u518d\u7acb\u523b\u8c03\u7528 print()<\/code>\u3002<\/p>\n
    \n
    \u4e00\u53e5\u8bdd\u603b\u7ed3\uff1athis \u5c31\u662f\u5f53\u524d\u5b9e\u4f8b\uff1b\u91cd\u540d\u65f6\u7528 this. \u6210\u5458\uff0c\u6784\u9020\u91cc\u7528 this() \u8f6c\u8c03\u53e6\u4e00\u4e2a\u6784\u9020\uff0c\u9700\u8981\u628a\u81ea\u5df1\u4ea4\u7ed9\u522b\u4eba\u65f6\u628a this \u5f53\u53c2\u6570\u4f20\u51fa\u53bb\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
    this \u7528\u6765\u8868\u793a\u5f53\u524d\u5bf9\u8c61\uff1a\u54ea\u4e2a\u5b9e\u4f8b\u6b63\u5728\u6267\u884c\u8fd9\u6bb5\u4ee3\u7801\uff0cthis \u5c31\u6307\u5411\u8c01\u3002\u901a\u8fc7\u5b83\u53ef\u4ee5\u8bbf\u95ee\u672c\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\u548c\u5b9e\u4f8b […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[16],"tags":[33,43],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/91"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=91"}],"version-history":[{"count":2,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/91\/revisions"}],"predecessor-version":[{"id":379,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/91\/revisions\/379"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=91"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=91"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=91"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}