接口的定义和使用

 
练习

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();

}

public interface Swim {
    public abstract void swim();
}

public class Rabit extends Animal{
    public Rabit() {
    }

    public Rabit(String name, int age) {
        super(name, age);
    }

    @Override
    public void eat() {
        System.out.println("兔子在吃东西");
    }
}

public class Frog extends Animal implements Swim{

    public Frog() {
    }

    public Frog(String name, int age) {
        super(name, age);
    }

    @Override
    public void eat() {
        System.out.println("青蛙吃虫子");
    }

    @Override
    public void swim() {
        System.out.println("青蛙在游泳");
    }
}