{"id":91,"date":"2015-03-30T11:48:44","date_gmt":"2015-03-30T03:48:44","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=91"},"modified":"2015-04-18T21:26:31","modified_gmt":"2015-04-18T13:26:31","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":"

this \u5173\u952e\u5b57\u7528\u6765\u8868\u793a\u5f53\u524d\u5bf9\u8c61\u672c\u8eab\uff0c\u6216\u5f53\u524d\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u901a\u8fc7 this \u53ef\u4ee5\u8c03\u7528\u672c\u5bf9\u8c61\u7684\u6240\u6709\u65b9\u6cd5\u548c\u5c5e\u6027\u3002\u4f8b\u5982\uff1a
\n
\n[java]public class Demo{
\n\u00a0\u00a0\u00a0 public int x = 10; \u00a0\u00a0\u00a0
\n\u00a0\u00a0\u00a0 public int y = 15;
\n\u00a0\u00a0\u00a0 public void sum(){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ \u901a\u8fc7 this \u83b7\u53d6\u6210\u5458\u53d8\u91cf
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 int z = this.x + this.y;
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println("x + y = " + z);
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0
\n\u00a0\u00a0\u00a0 public static void main(String[] args) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Demo obj = new Demo();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0obj.sum();
\n\u00a0\u00a0\u00a0 }
\n}[\/java]
\n\u8fd0\u884c\u7ed3\u679c\uff1a
\nx + y = 25<\/p>\n

\u4e0a\u9762\u7684\u7a0b\u5e8f\u4e2d\uff0cobj \u662f Demo \u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\uff0cthis \u4e0e obj \u7b49\u4ef7\uff0c\u6267\u884c int z = this.x + this.y;\uff0c\u5c31\u76f8\u5f53\u4e8e\u6267\u884c int z = obj.x + obj.y;\u3002<\/p>\n

\u6ce8\u610f\uff1athis \u53ea\u6709\u5728\u7c7b\u5b9e\u4f8b\u5316\u540e\u624d\u6709\u610f\u4e49\u3002
\n\u4f7f\u7528this\u533a\u5206\u540c\u540d\u53d8\u91cf<\/p>\n

\u6210\u5458\u53d8\u91cf\u4e0e\u65b9\u6cd5\u5185\u90e8\u7684\u53d8\u91cf\u91cd\u540d\u65f6\uff0c\u5e0c\u671b\u5728\u65b9\u6cd5\u5185\u90e8\u8c03\u7528\u6210\u5458\u53d8\u91cf\uff0c\u600e\u4e48\u529e\u5462\uff1f\u8fd9\u65f6\u5019\u53ea\u80fd\u4f7f\u7528this\uff0c\u4f8b\u5982\uff1a
\n[java]public class Demo{
\n\u00a0\u00a0\u00a0 public String name;
\n\u00a0\u00a0\u00a0 public int age;
\n\u00a0\u00a0
\n\u00a0\u00a0\u00a0 public Demo(String name, int age){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this.name = name;
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this.age = age;
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0
\n\u00a0\u00a0\u00a0 public void say(){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println("\u7f51\u7ad9\u7684\u540d\u5b57\u662f" + name + "\uff0c\u5df2\u7ecf\u6210\u7acb\u4e86" + age + "\u5e74");
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0
\n\u00a0\u00a0\u00a0 public static void main(String[] args) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Demo obj = new Demo("\u65b0\u534e\u82d1", 3);
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0obj.say();
\n\u00a0\u00a0\u00a0 }
\n}[\/java]
\n\u8fd0\u884c\u7ed3\u679c\uff1a
\n\u7f51\u7ad9\u7684\u540d\u5b57\u662f\u5fae\u5b66\u82d1\uff0c\u5df2\u7ecf\u6210\u7acb\u4e863\u5e74<\/p>\n

\u5f62\u53c2\u7684\u4f5c\u7528\u57df\u662f\u6574\u4e2a\u65b9\u6cd5\u4f53\uff0c\u662f\u5c40\u90e8\u53d8\u91cf\u3002\u5728Demo()\u4e2d\uff0c\u5f62\u53c2\u548c\u6210\u5458\u53d8\u91cf\u91cd\u540d\uff0c\u5982\u679c\u4e0d\u4f7f\u7528this\uff0c\u8bbf\u95ee\u5230\u7684\u5c31\u662f\u5c40\u90e8\u53d8\u91cfname\u548cage\uff0c\u800c\u4e0d\u662f\u6210\u5458\u53d8\u91cf\u3002\u5728 say() \u4e2d\uff0c\u6211\u4eec\u6ca1\u6709\u4f7f\u7528 this\uff0c\u56e0\u4e3a\u6210\u5458\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u662f\u6574\u4e2a\u5b9e\u4f8b\uff0c\u5f53\u7136\u4e5f\u53ef\u4ee5\u52a0\u4e0a this\uff1a
\npublic void say(){
\nSystem.out.println(“\u7f51\u7ad9\u7684\u540d\u5b57\u662f” + this.name + “\uff0c\u5df2\u7ecf\u6210\u7acb\u4e86” + this.age + “\u5e74”);
\n}
\nJava \u9ed8\u8ba4\u5c06\u6240\u6709\u6210\u5458\u53d8\u91cf\u548c\u6210\u5458\u65b9\u6cd5\u4e0e this \u5173\u8054\u5728\u4e00\u8d77\uff0c\u56e0\u6b64\u4f7f\u7528 this \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u662f\u591a\u4f59\u7684\u3002
\n\u4f5c\u4e3a\u65b9\u6cd5\u540d\u6765\u521d\u59cb\u5316\u5bf9\u8c61<\/p>\n

\u4e5f\u5c31\u662f\u76f8\u5f53\u4e8e\u8c03\u7528\u672c\u7c7b\u7684\u5176\u5b83\u6784\u9020\u65b9\u6cd5\uff0c\u5b83\u5fc5\u987b\u4f5c\u4e3a\u6784\u9020\u65b9\u6cd5\u7684\u7b2c\u4e00\u53e5\u3002\u793a\u4f8b\u5982\u4e0b\uff1a
\n[java]public class Demo{
\n\u00a0\u00a0\u00a0 public String name;
\n\u00a0\u00a0\u00a0 public int age;
\n\u00a0\u00a0\u00a0
\n\u00a0\u00a0\u00a0 public Demo(){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this("\u65b0\u534e\u82d1", 3);
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0
\n\u00a0\u00a0\u00a0 public Demo(String name, int age){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this.name = name;
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this.age = age;
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0
\n\u00a0\u00a0\u00a0 public void say(){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println("\u7f51\u7ad9\u7684\u540d\u5b57\u662f" + name + "\uff0c\u5df2\u7ecf\u6210\u7acb\u4e86" + age + "\u5e74");
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0
\n\u00a0\u00a0\u00a0 public static void main(String[] args) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Demo obj = new Demo();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0obj.say();
\n\u00a0\u00a0\u00a0 }
\n}[\/java]
\n\u8fd0\u884c\u7ed3\u679c\uff1a
\n\u7f51\u7ad9\u7684\u540d\u5b57\u662f\u5fae\u5b66\u82d1\uff0c\u5df2\u7ecf\u6210\u7acb\u4e863\u5e74<\/p>\n

\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff1a
\n\u5728\u6784\u9020\u65b9\u6cd5\u4e2d\u8c03\u7528\u53e6\u4e00\u4e2a\u6784\u9020\u65b9\u6cd5\uff0c\u8c03\u7528\u52a8\u4f5c\u5fc5\u987b\u7f6e\u4e8e\u6700\u8d77\u59cb\u7684\u4f4d\u7f6e\u3002
\n\u4e0d\u80fd\u5728\u6784\u9020\u65b9\u6cd5\u4ee5\u5916\u7684\u4efb\u4f55\u65b9\u6cd5\u5185\u8c03\u7528\u6784\u9020\u65b9\u6cd5\u3002
\n\u5728\u4e00\u4e2a\u6784\u9020\u65b9\u6cd5\u5185\u53ea\u80fd\u8c03\u7528\u4e00\u4e2a\u6784\u9020\u65b9\u6cd5\u3002<\/p>\n

\u4e0a\u8ff0\u4ee3\u7801\u6d89\u53ca\u5230\u65b9\u6cd5\u91cd\u8f7d\uff0c\u5373Java\u5141\u8bb8\u51fa\u73b0\u591a\u4e2a\u540c\u540d\u65b9\u6cd5\uff0c\u53ea\u8981\u53c2\u6570\u4e0d\u540c\u5c31\u53ef\u4ee5\u3002\u540e\u7eed\u7ae0\u8282\u4f1a\u8bb2\u89e3\u3002<\/p>\n

\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012<\/p>\n

\u9700\u8981\u5728\u67d0\u4e9b\u5b8c\u5168\u5206\u79bb\u7684\u7c7b\u4e2d\u8c03\u7528\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5e76\u5c06\u5f53\u524d\u5bf9\u8c61\u7684\u4e00\u4e2a\u5f15\u7528\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u65f6\u3002\u4f8b\u5982\uff1a
\n[java]public class Demo{
\n\u00a0\u00a0\u00a0 public static void main(String[] args){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B b = new B(new A());
\n\u00a0\u00a0\u00a0 }
\n}
\nclass A{
\n\u00a0\u00a0\u00a0 public A(){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 new B(this).print(); \/\/ \u533f\u540d\u5bf9\u8c61
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 public void print(){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println("Hello from A!");
\n\u00a0\u00a0\u00a0 }
\n}
\nclass B{
\n\u00a0\u00a0\u00a0 A a;
\n\u00a0\u00a0\u00a0 public B(A a){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 this.a = a;
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 public void print() {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0a.print();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println("Hello from B!");
\n\u00a0\u00a0\u00a0 }
\n}[\/java]
\n\u8fd0\u884c\u7ed3\u679c\uff1a
\nHello from A!
\nHello from B!<\/p>\n

\u533f\u540d\u5bf9\u8c61\u5c31\u662f\u6ca1\u6709\u540d\u5b57\u7684\u5bf9\u8c61\u3002\u5982\u679c\u5bf9\u8c61\u53ea\u4f7f\u7528\u4e00\u6b21\uff0c\u5c31\u53ef\u4ee5\u4f5c\u4e3a\u533f\u540d\u5bf9\u8c61\uff0c\u4ee3\u7801\u4e2d new B(this).print(); \u7b49\u4ef7\u4e8e ( new B(this) ).print();\uff0c\u5148\u901a\u8fc7 new B(this) \u521b\u5efa\u4e00\u4e2a\u6ca1\u6709\u540d\u5b57\u7684\u5bf9\u8c61\uff0c\u518d\u8c03\u7528\u5b83\u7684\u65b9\u6cd5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

this \u5173\u952e\u5b57\u7528\u6765\u8868\u793a\u5f53\u524d\u5bf9\u8c61\u672c\u8eab\uff0c\u6216\u5f53\u524d\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u901a\u8fc7 this \u53ef\u4ee5\u8c03\u7528\u672c\u5bf9\u8c61\u7684\u6240\u6709\u65b9\u6cd5\u548c\u5c5e\u6027\u3002\u4f8b\u5982 […]<\/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],"_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}]}}