JavaSE-11.1.4【多态案例-猫和狗】

package day2.yubaby01.p4;

/*
1.5 多态案例-猫和狗
 */

public class AnimalDemo {

    public static void main(String[] args) {
        Animal a = new Cat();
        a.setName("tom");
        a.setAge(3);
        System.out.println(a.getName() + "," + a.getAge());
        a.eat();

        a = new Cat("tom", 3);
        System.out.println(a.getName() + "," + a.getAge());
        a.eat();

        Animal aa = new Dog();
        aa.setName("sam");
        aa.setAge(1);
        System.out.println(aa.getName() + "," + aa.getAge());
        aa.eat();

        aa = new Dog("sam", 1);
        System.out.println(aa.getName() + "," + aa.getAge());
        aa.eat();
    }

}

　　

package day2.yubaby01.p4;

public class Animal {

    private String name;
    private int age;

    public Animal() {
    }

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

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

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

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    public void eat(){
        System.out.println("动物进食");
    }

}

　　

package day2.yubaby01.p4;

public class Cat extends Animal{

    public Cat() {
    }

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

    @Override
    public void eat(){
        System.out.println("猫吃啥？");
    }

}

　　

package day2.yubaby01.p4;

public class Dog extends Animal{

    public Dog() {
    }

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

    @Override
    public void eat(){
        System.out.println("狗吃啥？");
    }

}