设计模式之装饰模式 Decorator

Posted 2020-10-05 大白

 

 

代码实现

public interface ICar {
    void move();
}

抽象构建角色

//具体构件角色（真实对象，被装饰角色）
class Car implements ICar{

    @Override
    public void move() {
        System.out.println("陆地上跑");
    }
    
}

具体构建角色

//装饰角色
class SuperCar implements ICar{

    private ICar car;
    
    public SuperCar(ICar car) {
        super();
        this.car = car;
    }

    @Override
    public void move() {
        car.move();
    }
}

装饰角色

//具体装饰角色
class FlyCar extends SuperCar{

    public FlyCar(ICar car) {
        super(car);
        // TODO Auto-generated constructor stub
    }
    
    public void fly(){
        System.out.println("天上飞");
    }

    @Override
    public void move() {
        // TODO Auto-generated method stub
        super.move();
        fly();
    }    
}


class WaterCar extends SuperCar{

    public WaterCar(ICar car) {
        super(car);
        // TODO Auto-generated constructor stub
    }
    
    public void swim(){
        System.out.println("水中游");
    }

    @Override
    public void move() {
        // TODO Auto-generated method stub
        super.move();
        swim();
    }    
}


class AICar extends SuperCar{

    public AICar(ICar car) {
        super(car);
        // TODO Auto-generated constructor stub
    }
    
    public void autoMove(){
        System.out.println("自动驾驶");
    }

    @Override
    public void move() {
        // TODO Auto-generated method stub
        super.move();
        autoMove();
    }    
}

具体装饰角色

public class Client {

    public static void main(String[] args) {
        Car car = new Car();
        car.move();
        
//        System.out.println("增加新的功能，飞行-------");
//        FlyCar flycar = new FlyCar(car);
//        flycar.move();
//        
//        System.out.println("增加新的功能，水中游-------");
//        WaterCar waterCar = new WaterCar(flycar);
//        waterCar.move();
        
        System.out.println("增加两个新功能，飞行，水里游---");
        WaterCar waterCar2 = new WaterCar(new FlyCar(car));
        waterCar2.move();    
    }
}

调用测试