java回调函数的事例

public class Caller {  
  
    private MyCallback myCallback;  
      
    public void doCall(){  
        myCallback.func();  
    }  
  
    public void setMyCallback(MyCallback myCallback) {  
        this.myCallback = myCallback;  
    }  

    public interface MyCallback {  
  
        void func();  
      
    } 
      
}  

public class CallBackTest {  
  
    public static void main(String[] args) {  
          
        Caller caller = new Caller();  
      
        //实例化具体回调函数，实现回调方法  
        caller.setMyCallback(new MyCallback() {  
            @Override  
            public void func() {  
                System.out.println("Hello world");  
            }  
        });  
          
        caller.doCall();  
    }  
      
}