此类图中包含了几个动物类，Tiger、Dog和Cat，它们都包含各自的功能，三个类互相协作，以便完成类似于动物世界的游戏功能。因每个类都保持有其他两个类的类型的私有变量，在这个设计中的三个动物类之间存在高度的耦合。请在基本功能不变的情况下，对以上的设计选用合适的模式进行重构。 采用中介者模式使用java实现代码

以下是采用中介者模式进行重构的Java代码实现：

public interface AnimalMediator {
    void play();
    void feed(String animalType);
    void sleep(String animalType);
}

public class AnimalGame implements AnimalMediator {
    private Tiger tiger;
    private Dog dog;
    private Cat cat;

    public AnimalGame(Tiger tiger, Dog dog, Cat cat) {
        this.tiger = tiger;
        this.dog = dog;
        this.cat = cat;
    }

    @Override
    public void play() {
        System.out.println("开始玩耍！");
        tiger.roar();
        dog.bark();
        cat.meow();
    }

    @Override
    public void feed(String animalType) {
        System.out.println("给" + animalType + "喂食！");
        switch (animalType) {
            case "Tiger":
                tiger.eat();
                break;
            case "Dog":
                dog.eat();
                break;
            case "Cat":
                cat.eat();
                break;
            default:
                System.out.println("无法识别的动物类型！");
        }
    }

    @Override
    public void sleep(String animalType) {
        System.out.println(animalType + "开始睡觉！");
        switch (animalType) {
            case "Tiger":
                tiger.rest();
                break;
            case "Dog":
                dog.rest();
                break;
            case "Cat":
                cat.rest();
                break;
            default:
                System.out.println("无法识别的动物类型！");
        }
    }
}

public abstract class Animal {
    protected AnimalMediator mediator;
    protected String type;

    public Animal(String type, AnimalMediator mediator) {
        this.type = type;
        this.mediator = mediator;
    }

    public abstract void eat();
    public abstract void rest();
}

public class Tiger extends Animal {
    public Tiger(AnimalMediator mediator) {
        super("Tiger", mediator);
    }

    public void roar() {
        System.out.println("老虎咆哮！");
    }

    @Override
    public void eat() {
        System.out.println("老虎吃肉！");
    }

    @Override
    public void rest() {
        System.out.println("老虎躺下休息！");
    }
}

public class Dog extends Animal {
    public Dog(AnimalMediator mediator) {
        super("Dog", mediator);
    }

    public void bark() {
        System.out.println("狗叫汪汪！");
    }

    @Override
    public void eat() {
        System.out.println("狗啃骨头！");
    }

    @Override
    public void rest() {
        System.out.println("狗趴下休息！");
    }
}

public class Cat extends Animal {
    public Cat(AnimalMediator mediator) {
        super("Cat", mediator);
    }

    public void meow() {
        System.out.println("猫叫喵喵！");
    }

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

    @Override
    public void rest() {
        System.out.println("猫卧下休息！");
    }
}

public class Main {
    public static void main(String[] args) {
        Tiger tiger = new Tiger(new AnimalGame(tiger, dog, cat));
        Dog dog = new Dog(new AnimalGame(tiger, dog, cat));
        Cat cat = new Cat(new AnimalGame(tiger, dog, cat));

        AnimalMediator mediator = new AnimalGame(tiger, dog, cat);

        mediator.play();
        mediator.feed("Tiger");
        mediator.feed("Dog");
        mediator.feed("Cat");
        mediator.sleep("Tiger");
        mediator.sleep("Dog");
        mediator.sleep("Cat");
    }
}

在这个重构后的设计中，中介者模式被用于减少三个动物类之间的耦合。在这种模式下，AnimalMediator 接口充当中介者角色，AnimalGame 类实现了中介者接口。每个动物类都持有中介者的引用，并通过中介者来与其他动物类进行通信。当需要进行玩耍、喂食或休息时，动物类会向中介者发送请求，中介者会根据请求类型来调用相应的方法。这样，每个动物类都可以专注于自己的功能，而不需要关心其他动物类的状态和行为。