面向对象进阶（继承）

需求

​ 1.定义动物类

​ 属性：
​ 年龄，颜色
​ 行为:
​ eat(String something)方法(无具体行为,不同动物吃的方式和东西不一样,something表示吃的东西)

​ 生成空参有参构造，set和get方法

​ 2.定义狗类继承动物类

​ 行为:
​ eat(String something)方法,看家lookHome方法(无参数)

​ 3.定义猫类继承动物类

​ 行为:

​ eat(String something)方法,逮老鼠catchMouse方法(无参数)

​ 4.定义Person类

​ 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

​ 该方法调用后打印结果为：颜色为黑色的2岁的狗，在吃骨头

​ 行为：
​ keepPet(Cat cat,String something)方法
​ 功能：喂养宠物猫，something表示喂养的东西

​ 该方法调用后打印结果为：颜色为白色的2岁的猫，在吃小鱼干

​ 5.生成空参有参构造，set和get方法

​ 6.测试以上方法

Animal

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

    public Animal() {

    }

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



    public int getAge() {
        return age;
    }

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

    public String getColor() {
        return color;
    }

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



    public String eat(String something) {
      return "在吃" + something;
    }
}

Dog

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

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

    public void lookHome(){
        System.out.println("看家");
    }

}

Cat

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

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

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

Person

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 name;
    }

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

    public int getAge() {
        return age;
    }

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

    public void keepPet(Dog dog, String something) {
        System.out.println("颜色为" + dog.getColor() + "的" + dog.getAge() + "岁" + "的狗，" + dog.eat(something));
    }

    public void keepPet(Cat cat, String something) {
        System.out.println("颜色为" + cat.getColor() + "的" + cat.getAge() + "岁" + "的猫，" + cat.eat(something));
    }
}

Test

public class Test {
    public static void main(String[] args) {
        Person p = new Person("小夭", 23);
        System.out.println(p.getName() + "," + p.getAge());
        Dog d = new Dog(3, "金色");
        p.keepPet(d, "骨头");
        d.lookHome();


        Cat c = new Cat(2, "银色");
        p.keepPet(c, "小鱼干");
        c.catchMouse();

    }
}