求解答：装饰者模式去除掉抽象装饰类为什么会出现线程出现栈溢出

public class aaa {
public static void main(String[] args) {
Drink coffe = new Coffe();
Drink suger = new Suger(coffe);
System.out.println(suger.info()+"-->"+suger.cost());

}

}
//抽象组件
interface Drink{
double cost();//费用
String info();//说明
}
//具体组件
class Coffe implements Drink{
private String name = "原味咖啡";
@Override
public double cost() {
return 10;
}

@Override
public String info() {  
    return name;
}

}

//具体装饰类

class Suger implements Drink{

private Drink drink;
public Suger(Drink drink) {
    this.drink = drink;
}

@Override
public double cost() {
    return this.cost()*2;
}

@Override
public String info() {
    return this.info()+"加入了糖";
}

}

函数自己调用自己，造成了无限递归