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 {@Overridepublic void show1() {}@Overridepublic void show2() {}@Overridepublic void show3() {}@Overridepublic void show4() {}
}

InterImpl

package com.itheima.a09;public class InterImpl extends  InterAdapter{
//   用到哪个方法 就重新哪个@Overridepublic void show2() {System.out.println("只用第二个方法");}
}

总结