接口

package com_black.jiekou;

public interface Jumping {
    public abstract void jump();
}

package com_black.jiekou;

public abstract class Animal {
    private String name;
    private int age;
    public Animal(){

    }

    public Animal(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public abstract void eat();
}

package com_black.jiekou;

public class Cat extends Animal implements Jumping{
    public Cat(){
    }

    public Cat(String name, int age) {
        super(name, age);
    }
    @Override
    public void eat(){
        System.out.println("猫吃鱼");
    }
    @Override
    public void jump(){
        System.out.println("猫可以跳高了");
    }
}

package com_black.jiekou;
//测试类
public class AnimalDemo {
    public static void main(String[] args) {
        Jumping j=new Cat();
        j.jump();
        System.out.println("--------");

        Animal a=new Cat();
        a.setName("加菲");
        a.setAge(5);
        System.out.println(a.getName()+","+a.getAge());
        a.eat();

        a =new Cat("加菲",5);
        System.out.println(a.getName()+","+a.getAge());
        a.eat();
        System.out.println("-------------");

        Cat c=new Cat();
        c.setName("西卡");
        c.setAge(3);
        System.out.println(c.getName()+","+c.getAge());
        c.eat();
        c.jump();
    }
}