兩個類：Dog和Cat，一個介面CallBack。

1 Dog類，實現介面CallBack介面：

public class Dog implements CallBack {

    private Cat cat;
    public Dog(Cat li){
        this.cat=li;
    }
    public void ask(String s){
        System.out.println("dog is asking");
        //呼叫cat的ask方法，並把當前物件註冊進去
        cat.ask(this,s);
    }
    //回撥函式
    @Override
    public void solve(String s) {
        System.out.println("執行回撥函式");
        System.out.print(s);
    }
}
 

public class Cat {
    private CallBack callBack;
    public void ask(CallBack callBack,String s){
        System.out.println("cat:ask");
        callBack.solve(s);
    }
    //內部類進行介面回撥
    public void  setCallBack(CallBack callBack){
        System.out.println("Cat:setCallBack");
        callBack.solve("執行回撥函式");
    }
}
 

cat=new Cat();
dog=new Dog(cat);
dog.ask("dog is asking");

dog is asking
cat:ask
執行回撥函式
dog is asking

****匿名內部類實現介面回撥****

a.測試程式碼如下：

  cat=new Cat();
        cat.setCallBack(new CallBack() {
          @Override
          public void solve(String s) {
              System.out.println("執行回撥函式引數-s   "+s);
              System.out.println("內部類回撥函式");
          }
      });
 

Cat:setCallBack
執行回撥函式引數-s   執行回撥函式
內部類回撥函式