装饰者模式

//被装饰者---接口
interface Person {
    void eat();
}

//被装饰者---实现类
class Man implements Person {
    public void eat() {
        System.out.println("男人在吃饭");
    }
}

//装饰者--抽象类，实现了被装饰者接口，持有被装饰者的引用
abstract class Decorator implements Person {

    private Person person;
    
    public Decorator(Person person) {
        this.person = person;
    }
    
    public void eat() {
        person.eat();
    }
}

//定义装饰者A---实现类
class ManDecoratorA extends Decorator {
    public ManDecoratorA(Person person) {
        super(person);
    }
    
    public void eat() {
        super.eat();
        reEat();
        System.out.println("装饰类B");
    }

    public void reEat() {
        System.out.println("再吃一顿炒面");
    }
}

//定义装饰者B---实现类
class ManDecoratorB extends Decorator {
    public ManDecoratorB(Person person) {
        super(person);
    }    
    public void eat() {
        System.out.println("=======例子2========");
        super.eat();
        reEat();
        System.out.println("装饰类A");
    }
    public void reEat() {
        System.out.println("再喝一碗粥");
    }
}

//测试类  
public class Test {  
    public static void main(String[] args) {  
        Man man = new Man();
        ManDecoratorA md1 = new ManDecoratorA(man);
        ManDecoratorB md2 = new ManDecoratorB(man);
   
        md1.eat();
        md2.eat();
    }  
}