Decorator Pattern in Java

Main.java

package com.company;

interface Coffee{
    Double getCost();
    String getIngredients();
}

class SimpleCoffee implements Coffee {

    @Override
    public Double getCost() {
        return 3.0;
    }

    @Override
    public String getIngredients() {
        return "Coffee";
    }
}

class CoffeeDecorator implements Coffee{

    Coffee decoratedCoffee;
    String ingredientSeperator = " , ";

    CoffeeDecorator(Coffee decoratedCoffee) {
        this.decoratedCoffee = decoratedCoffee;
    }


    @Override
    public Double getCost() {
        return decoratedCoffee.getCost();
    }

    @Override
    public String getIngredients() {
        return decoratedCoffee.getIngredients();
    }
}

class Milk extends CoffeeDecorator{

    public Milk(Coffee decoratedCoffee) {
        super(decoratedCoffee);
    }

    @Override
    public Double getCost() {
        return super.getCost() + 0.7;
    }

    @Override
    public String getIngredients() {
        return super.getIngredients() + ingredientSeperator + "Milk";
    }
}

class WhipCoffee extends CoffeeDecorator{

    public WhipCoffee(Coffee decoratedCoffee) {
        super(decoratedCoffee);
    }

    @Override
    public Double getCost() {
        return super.getCost() + 1.0;
    }

    @Override
    public String getIngredients() {
        return super.getIngredients() + ingredientSeperator + "Whip";
    }
}



public class Main {

    public static void main(String[] args) {
	// write your code here

        Coffee simpleCoffee = new SimpleCoffee();
        System.out.println("Cost: " + simpleCoffee.getCost() + " Ingredients: " + simpleCoffee.getIngredients());

        simpleCoffee = new Milk(simpleCoffee);
        System.out.println("Cost: " + simpleCoffee.getCost() + " Ingredients: " + simpleCoffee.getIngredients());

        simpleCoffee = new WhipCoffee(simpleCoffee);
        System.out.println("Cost: " + simpleCoffee.getCost() + " Ingredients: " + simpleCoffee.getIngredients());
    }
}