JAVA装饰者模式（从现实生活角度理解代码原理）

 public interface GuoDi {
   public float cost();//锅底当然要有价钱啦
   public String name();//名字也得有哦
 }

public class YuanYang implements GuoDi {
  @Override
  public float cost() {
    return 48.0f;
  }
  @Override
  public String name() {
    return "鸳鸯锅底";
  }
}
public class DaLongYan implements GuoDi{
  @Override
  public float cost() {
    return 59.0f;
  }
  @Override
  public String name() {
    return "大龙燚火锅原味锅底";
  }
}

public abstract class PeiCai implements GuoDi {
  private GuoDi guodi;
  public FoodDecorator(GuoDi guodi) {
    super();
    this.guodi = guodi;
  }
  @Override
  public float cost() {
    return guodi.cost();
  }
  @Override
  public String name() {
    return guodi.name();
  }
}

public class MaLaNiuRou extends PeiCai {
  public MaLaNiuRou(GuoDi guodi) {
    super(guodi);
  }
  @Override
  public float cost() {
    return super.cost()+46f;
  }
  @Override
  public String name() {
    return super.name()+"+麻辣牛肉";
  }
}
public class MaoDu extends PeiCai {

  public MaoDu(GuoDi guodi) {
    super(guodi);
  }
  @Override
  public float cost() {
    return super.cost()+30f;
  }
  @Override
  public String name() {
    return super.name()+"+大刀毛肚";
  }
}

public class Test {
  public static void main(String[] args) {
    GuoDi guodi = new DaLongYan ();//点个大龙燚火锅原味锅底
    MaLaNiuRou y = new MaLaNiuRou(guodi);//来个麻辣牛肉
    MaoDu x = new MaoDu(y);//在麻辣牛肉的基础上再来个大刀毛肚
    System.out.println("一共点了"+x.name()+",共消费"+s.cost());
  }
}