代理设计模式

interface A
{public void get();
}
class B implements A
{public void get(){
    System.out.println("出席活动");
}
}
class C implements A
{private A a;
 public C(A a){
   this.a=a;
   }
public void print (){
   System.out.println("接到媒体通知");
   }
public void get(){
   this.print();
   this.a.get();
   this.stop();
   }
public void stop(){
    System.out.println("结束");
       }
}
public class vvv
{public static void main(String args[]){
    A a=new C(new B());
    a.get();
    }
}