接口中包含抽象类demo

package jiechoudemo;
/*
 * 接口中包含抽象类
 */
public class jiechoudemo {
    public static void main(String[] args) {
         windows.door wd = new zhuozi().new yizi();
         wd.close();
    }
  
}
//写一个接口
interface windows{
    public abstract void open();
    //抽象类
    abstract class door{
        public abstract void close();
    }
}
//子类去实现接口
class zhuozi implements windows{
    public void open(){
        System.out.println("open  la");
    }
    class yizi extends door{
        public void close(){
            System.out.println("close   la");
        }
    }
}