java回调函数
C++回调函数通过函数指针实现,Java中没有函数指针,可以通过接口实现。
1 interface IShow{ 2 public void show(String str); 3 } 4 5 class ShowA implements IShow{ 6 public void show(String str) { 7 System.out.println(str+" is very high!"); 8 } 9 }; 10 11 class ShowB implements IShow{ 12 public void show(String str) { 13 System.out.println(str+" is very rich!"); 14 } 15 }; 16 17 class ShowC implements IShow{ 18 public void show(String str) { 19 System.out.println(str+" is very handsome!"); 20 } 21 };
1 String str = "Jack"; 2 IShow showA = new ShowA(); 3 IShow showB = new ShowB(); 4 IShow showC = new ShowC(); 5 showA.show(str); 6 showB.show(str); 7 showC.show(str);
运行结果:
可通过接口对相应功能进行扩展和更新。