装饰模式，制作一个蛋糕java

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();

}

}