接口的应用 

 适配器设计模式 

 

Inter

package com.itheima.a09;

public interface Inter {
    public abstract void show1();
    public abstract void show2();
    public abstract void show3();
    public abstract void show4();


}

InterAdapter

package com.itheima.a09;
//抽象
public abstract class InterAdapter implements Inter {
    @Override
    public void show1() {

    }

    @Override
    public void show2() {

    }

    @Override
    public void show3() {

    }

    @Override
    public void show4() {

    }
}

InterImpl

package com.itheima.a09;

public class InterImpl extends  InterAdapter{
//   用到哪个方法 就重新哪个

    @Override
    public void show2() {
        System.out.println("只用第二个方法");
    }
}

总结