实现猫和老虎类，猫和老虎继承animal,同时写eat和run方法，设置扩展属性和方法

在面向对象编程中，你可以创建一个`Animal`基类作为所有动物的通用模板，然后分别定义`Cat`和`Tiger`两个子类，它们继承自`Animal`，并覆盖或扩展必要的功能。

首先，我们创建一个`Animal`基类：

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

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

    // 定义通用的行为
    public void eat() {
        System.out.println(name + " is eating.");
    }

    public void run() {
        System.out.println(name + " is running at a moderate speed.");
    }

    // 扩展属性和方法
    public void displayInfo() {
        System.out.println("Name: " + name + ", Age: " + age);
    }
}

接着，我们为`Cat`和`Tiger`这两个子类添加特定行为：

public class Cat extends Animal {
    public Cat(String name, int age) {
        super(name, age);
    }

    @Override
    public void eat() {
        System.out.println(name + " is eating fish.");
    }

    // 猫的特有方法
    public void climbTree() {
        System.out.println(name + " is climbing a tree.");
    }
}

public class Tiger extends Animal {
    public Tiger(String name, int age) {
        super(name, age);
    }

    @Override
    public void eat() {
        System.out.println(name + " is hunting and eating meat.");
    }

    // 老虎的特有方法
    public void roar() {
        System.out.println(name + " is roaring loudly.");
    }
}

现在，你可以实例化`Cat`和`Tiger`对象，并通过它们的父类`Animal`引用调用方法，或者直接调用它们特有的方法：

public static void main(String[] args) {
    Cat cat = new Cat("Mimi", 3);
    cat.eat();       // 输出: Mimi is eating fish.
    cat.run();
    cat.climbTree();

    Tiger tiger = new Tiger("Leo", 5);
    tiger.eat();      // 输出: Leo is hunting and eating meat.
    tiger.run();
    tiger.roar();
}