代理模式和工厂模式

代理 https://www.yuque.com/wangchao-volk4/fdw9ek/pc33e3

public interface Animal {
    void eat();
}

public class Dog implements Animal{
    @Override
    public void eat() {
        System.out.println("dog eat......");
    }
}

// 代理类
public class AnimalProxy implements Animal {
    private Animal animal;
    public AnimalProxy(Animal animal) {
        this.animal = animal;
    }
    @Override
    public void eat() {
        System.out.println("before eat.....");
        animal.eat();
        System.out.println("after eat.....");
    }
}

// 工厂用来生产代理类
public class ProxyFactory {
    // 通过工厂获取代理类
    public static Animal getAnimal(Animal animal) {
        return new AnimalProxy(animal);
    }
}

// 测试

public class Main {
    public static void main(String[] args) {
        Animal animal = ProxyFactory.getAnimal(new Dog());
        animal.eat();
    }
}