NBA之装饰器模式

Design Pattern:

Decorator pattern allows a user to add new functionality to an existing object without altering its structure. This type of design pattern comes under structural pattern as this pattern acts as a wrapper to existing class. 模式：装饰器模式允许类上添加新功能并且不改变原有的状态,属于结构性模式

故事场景：不是创建这个类的子类，而是implements实现被装饰类的接口，然后 引用被装饰类方法，并且加上自己另外实现的方法（继承比组合更加膨胀）

Player

  public interface Player {

      void play();
  }

  public class Curry implements Player {
      @Override
      public void play() {
           System.out.println("Curry 远投3分");
      }
  }

PlayerDecorator装饰器

  public class PlayerDecorator implements Player {

      protected Player player;

      public PlayerDecorator(Player player){
          this.player = player;
      }

      @Override
      public void play() {
          player.play();
          dunk();
      }

      public void dunk(){
          System.out.println("顺便又暴扣2分");
      }
  }

实验的开始

    public class DecoratorDemo {

        public static void main(String[] args) {
            Player curry = new Curry();
            Player player = new PlayerDecorator(curry);
            player.play();
        }
    }

结果