java:多态练习

根据需求完成代码:1.定义狗类
属性
行为:
2.定义猫类
属性:
行为:
年龄，颜色
eat(String something)(something表示吃的东西)看家lookHome方法(无参数)
年龄，颜色
eat(String something)方法(something表示吃的东西)逮老鼠catchMouse方法(无参数)
3.定义Person类//饲养员
属性姓名，年龄行为:
keepPet(Dog dog,String something)方法功能:喂养宠物狗，something表示喂养的东西
行为:
keepPet(Cat cat,String something)方法功能:喂养宠物猫，something表示喂养的东西生成空参有参构造，set和get方法4.定义测试类(完成以下打印效果):keepPet(Dog dog,String somethind)方法打印内容如下:年龄为30岁的老王养了一只黑颜色的2岁的狗2岁的黑颜色的狗两只前腿死死的抱住骨头猛吃keepPet(Cat cat,String somethind)方法打印内容如下:年龄为25岁的老李养了一只灰颜色的3岁的猫3岁的灰颜色的猫眯着眼睛侧着头吃鱼
5.思考:
1.Dog和Cat都是Animal的子类，以上案例中针对不同的动物，定义了不同的keepPet方法，过于繁琐，能否简化，并体会简化后的好处?
2.Doq和Cat虽然都是Animal的子类，但是都有其特有方法，能否想办法在keepPet中调用特有方法?

package 多态练习;

public class Animal {
    private int age;
    private String color;

    //空参构造
    public Animal(){}

    //传参构造
    public Animal(int age,String color)
    {
        this.age=age;
        this.color=color;
    }

    public int getAge()
    {
        return age;
    }

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

    public String getColor()
    {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public void eat(String something)
    {
        System.out.println("小动物在吃"+something);
    }
}

package 多态练习;

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

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

    @Override
    public void eat(String something)
    {
        System.out.println(getAge()+"的"+getColor()+"颜色的猫咪着眼睛侧着头吃"+something);
    }

    public void catchMouse()
    {
        System.out.println("猫咪在逮老鼠");
    }

}

package 多态练习;

public class Duck extends Animal{
    //构造
    public Duck(){}

    public Duck(int age,String color){
        super(age,color);
    }

    @Override
    public void eat(String something)
    {
        System.out.println(getAge()+"岁的"+getColor()+"颜色的鸭子在叫");
    }

    public void Play()
    {
        System.out.println("鸭子在嘻嘻");
    }
}

package 多态练习;

public class person {
    private String name;
    private int age;

    public person() {
    }

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

    public String getName() {
        return this.name;
    }

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

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

    public int getAge() {
        return age;
    }

   /* public void KeepPet(Duck duck,String something)
    {
        System.out.println("年龄为"+getAge()+"的老王养了一只"+duck.getColor()+"颜色的"+duck.getAge()+"的小鸭子");
        duck.eat(something);
    }

    public void KeepPet(Cat cat,String something)
    {
        System.out.println("年龄为"+getAge()+"的老李养了一只"+cat.getColor()+"颜色的"+cat.getAge()+"的猫");
        cat.eat(something);
    }*/

    //想用一个方法接受所有的动物，包括猫，狗在内
    //方法的形参：可以写这些父类Animal
    public void KeepPet(Animal a, String something) {
        if (a instanceof Duck b) {
            System.out.println("年龄为" + age + "岁的" + name + "养了一只" + a.getColor() + "颜色的" + a.getAge() + "岁的鸭子");
            b.eat(something);
        } else if (a instanceof Cat c) {
            System.out.println("年龄为" + age + "岁的" + name + "养了一只" + a.getColor() + "颜色的" + a.getAge() + "岁的猫");
            c.eat(something);
        } else {
            System.out.println("没有这种动物");
        }
    }
}

package 多态练习;

public class test {
    public static void main(String[] args) {
        //创建对象并且调用方法
        person person1=new person("老王",30);
        person person2=new person("老李",25);
        Duck duck1=new Duck(2,"黄");
        Duck duck2=new Duck(3,"白");


        person1.KeepPet(duck1,"米粒");
        person2.KeepPet(duck2,"粉条");

        person p=new person("老王",30);
        Duck a=new Duck(2,"黄色");
        Cat c=new Cat(3,"灰色");

        p.KeepPet(a,"米");
        p.KeepPet(c,"小鱼仔");


    }
}

 

 

 

 

原文地址：https://blog.csdn.net/2303_81073778/article/details/143726589

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