JavaSE-11.2.3【抽象类案例-猫和狗】

package day2.yubaby02.p3;

/*
2.4 抽象类案例-猫和狗
 */

public class AnimalDemo {

    public static void main(String[] args) {
        Animal a1 = new Cat();
        a1.setName("tom");
        a1.setAge(1);
        System.out.println(a1.getName() + "," + a1.getAge());
        a1.eat();

        Animal a2 = new Cat("tom", 1);
        System.out.println(a2.getName() + "," + a2.getAge());
        a2.eat();

        Animal a3 = new Dog();
        a3.setName("sam");
        a3.setAge(2);
        System.out.println(a3.getName() + "," + a3.getAge());
        a3.eat();

        Animal a4 = new Dog("sam", 2);
        System.out.println(a4.getName() + "," + a4.getAge());
        a4.eat();
    }

}

　　

package day2.yubaby02.p3;

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 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");
    }*/

    public abstract void eat();
}

　　

package day2.yubaby02.p3;

public class Cat extends Animal{

    public Cat() {
    }

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

    //技巧-子类重载父抽象类中的抽象方法，键入eat,idea候选选中自动生成函数
    @Override
    public void eat() {
        System.out.println("猫吃啥？");
    }
}

　　

package day2.yubaby02.p3;

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？");
    }
}