抽象类中包含接口demo

package neibuneidemo;
/*
 * 抽象方法中包含接口
 */
public class neibuneidemo {
public static void main(String[] args) {
    //实例化内部接口对象
    windows.door wd = new zhuozi().new yizi();
    wd.close();
}
}
//写一个抽象类
abstract class windows{
    public abstract void open();
    //接口
    interface door{
        public abstract void close();
    }
}
//写一个子类去继承windows
 class zhuozi extends windows{
     //重写open
     public void open(){
         System.out.println("kai l ");
     }
     //实现接口,内部类
     class yizi implements door{
         public void close(){
             System.out.println("guan  la");
         }
     }
 }