抽象类：案例:猫和狗

Posted 2021-07-31 yangbocsu

抽象类：案例:猫和狗

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需求:请采用抽象类的思想实现猫和狗的案例，并在测试类中进行测试

 

1 定义动物类

package com.itheima_02;
/*
抽象类
*/
public abstract class Animal {
    private int age = 20;
    private  String name;

    //无参构造方法
    public Animal() {
    }

    //带参数构造方法
    public Animal(int age, String name) {
        this.age = age;
        this.name = name;
    }

    //生成对应的get() set() 方法

    public int getAge() {
        return age;
    }

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

    public String getName() {
        return name;
    }

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

    //抽象方法
    public abstract void eat();




}

 

2 定义猫类

package com.itheima_02;

public class Cat extends Animal{

    //两个构造方法
    public Cat() {
    }

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

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

 

 

3 定义狗类

package com.itheima_02;

public class Dog extends Animal{
    //生成构造方法
    public Dog() {
    }

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

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

 

 

4 定义AnimalDemo类

package com.itheima_02;

public class AnimalDemo {
    public static void main(String[] args) {
        //

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

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

        Animal b = new Dog();
        b.setAge(45);
        b.setName("哈士奇");
        System.out.println(b.getName()+","+b.getAge());
        b.eat();

        b = new Dog(23,"中华田园犬");
        System.out.println(b.getName()+","+b.getAge());
        b.eat();


    }
}