import java.text.DecimalFormat; //抽象组件组件interface mkcake{    public void cake();}class  Cake implements mkcake{    @Override    public void cake() {        // TODO Auto-generated method stub        System.out.println("一个成型蛋糕");            }     }//装饰接口abstract class Decorator implements mkcake{    mkcake m;          public Decorator(mkcake m)      {          this.m=m;      }        }class AddMilk extends Decorator{    public AddMilk(mkcake m)    {        super(m);    }    @Override    public void cake() {        // TODO Auto-generated method stub        m.cake();        System.out.println("加了牛奶");            }        }class AddEgg extends Decorator{    public AddEgg(mkcake m)    {        super(m);    }    @Override    public void cake() {        // TODO Auto-generated method stub        m.cake();        System.out.println("加了鸡蛋");            }        }public class 装饰模式 {    /**     * @param args     */    public static void main(String[] args) {        // TODO Auto-generated method stub        //开始制作蛋糕        mkcake c=new Cake();        mkcake m=new AddMilk(new AddEgg(new Cake()));        m.cake();    }}