1、一个实现类继承实现多个接口

接口A：

package com.interfPack;
public interface MyInterfaceA {
  public abstract void methodsA();
}

接口B：

package com.interfPack;
public interface MyInterfaceB {
    public abstract void methodsB();
}

实现类：

package com.interfPack;
public class InterfaceABDemo implements MyInterfaceA,MyInterfaceB{
//等同于 
 //public class InterfaceABDemo extends Object implements MyInterfaceA,MyInterfaceB{
    @Override
    public void methodsA() { //覆盖重写接口A的抽象方法
        System.out.println("重写A");
    }
    @Override
    public void methodsB() { //覆盖重写接口B的抽象方法
        System.out.println("重写B");
    }
}

调用：

package com.interfPack;

public class UseDemo {
    public static void main(String[] args) {
       InterfaceABDemo interfaceABDemo=new InterfaceABDemo();
       interfaceABDemo.methodsA(); //调用方法A
       interfaceABDemo.methodsB(); //调用方法B
    }
}