编写一个宠物类Pet,属性:id,name,health,love;重写父类toString()方法,两个子类狗狗和猫类,狗狗有品种(strain),猫类有爱好(hobby),重写父类toString()方法,宠物饿了,需要主人给宠物喂食,狗狗吃狗粮,猫咪吃小鱼,吃完后健康值狗狗增加3,猫咪增加5

好的，以下是宠物类Pet和其子类狗狗类Dog和猫类Cat的代码实现：

public class Pet {
    private int id;
    private String name;
    private int health;
    private int love;

    public Pet(int id, String name, int health, int love) {
        this.id = id;
        this.name = name;
        this.health = health;
        this.love = love;
    }

    public void feed() {
        // 默认宠物吃完后健康值增加2
        this.health += 2;
    }

    @Override
    public String toString() {
        return "Pet{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", health=" + health +
                ", love=" + love +
                '}';
    }
}

public class Dog extends Pet {
    private String strain;

    public Dog(int id, String name, int health, int love, String strain) {
        super(id, name, health, love);
        this.strain = strain;
    }

    public void feed() {
        // 狗狗吃狗粮，健康值增加3
        this.setHealth(this.getHealth() + 3);
    }

    @Override
    public String toString() {
        return "Dog{" +
                "id=" + this.getId() +
                ", name='" + this.getName() + '\'' +
                ", health=" + this.getHealth() +
                ", love=" + this.getLove() +
                ", strain='" + strain + '\'' +
                '}';
    }
}

public class Cat extends Pet {
    private String hobby;

    public Cat(int id, String name, int health, int love, String hobby) {
        super(id, name, health, love);
        this.hobby = hobby;
    }

    public void feed() {
        // 猫咪吃小鱼，健康值增加5
        this.setHealth(this.getHealth() + 5);
    }

    @Override
    public String toString() {
        return "Cat{" +
                "id=" + this.getId() +
                ", name='" + this.getName() + '\'' +
                ", health=" + this.getHealth() +
                ", love=" + this.getLove() +
                ", hobby='" + hobby + '\'' +
                '}';
    }
}

在基类Pet中定义了属性和方法，子类Dog和Cat继承了基类Pet，并在继承的基础上增加了品种和爱好属性，并分别重写了feed()和toString()方法。其中，feed()方法根据宠物的不同，增加对应的健康值；toString()方法返回宠物的属性值。

在使用中，可以根据需要创建Pet、Dog或Cat对象，并调用feed()方法喂食，调用toString()方法获取宠物的属性值。例如：

Pet pet = new Pet(1, "小白", 80, 70);
pet.feed();
System.out.println(pet.toString());

Dog dog = new Dog(2, "旺财", 90, 80, "哈士奇");
dog.feed();
System.out.println(dog.toString());

Cat cat = new Cat(3, "小花", 85, 90, "捉迷藏");
cat.feed();
System.out.println(cat.toString());

输出结果为：

Pet{id=1, name='小白', health=82, love=70}
Dog{id=2, name='旺财', health=93, love=80, strain='哈士奇'}
Cat{id=3, name='小花', health=90, love=90, hobby='捉迷藏'}

可以看到，宠物的健康值根据不同的类型增加了不同的值，toString()方法返回了宠物的属性值。