Create Mode -- Builder mode

1 

2 

interface Packing{
    public String pack();
}
class Wrapper implements Packing{
    @Override
    public String pack() {
        return "Wrapper";
    }
}
class Bottle implements Packing{
    @Override
    public String pack() {
        return "Bottle";
    }
}
interface Item{
    public String name();
    public Packing pack();
    public float price();
}
abstract class Hambur implements Item{
    @Override
    public Packing pack() {
        return new Wrapper();
    }
    @Override
    public abstract float price();
}
abstract class Colddrink implements Item{
    @Override
    public Packing pack() {
        return new Bottle();
    }
    @Override
    public abstract float price();
}
class Mcdonald extends Hambur{
    @Override
    public float price() {
        return 1000.0f;
    }
    @Override
    public String name() {
        return "Mcdonald";
    }
}
class KFC extends Hambur{
    @Override
    public float price() {
        return 2000.0f;
    }
    @Override
    public String name() {
        return "KFC";
    }
}
class Coca extends Colddrink{
    @Override
    public float price() {
        return 100.0f;
    }
    @Override
    public String name() {
        return "Coca";
    }
}
class Pepsi extends Colddrink{
    @Override
    public float price() {
        return 200.0f;
    }
    @Override
    public String name() {
        return "Pepsi";
    }
}
class Meal{
    private List<Item> items = new ArrayList<Item>();
    public void addItem(Item item){
        items.add(item);
    }
    public float getPrice(){
        float cost = 0.0f;
        for (Item item : items){
            cost += item.price();
        }
        return cost;
    }
    public void showItem(){
        for (Item item : items){
            System.out.println(item.name() + " " + item.price() + " ");
        }
        System.out.println(getPrice());
    }
}
class MealBuilder{
    public Meal prepareKFC(){
        Meal meal = new Meal();
        meal.addItem(new KFC());
        meal.addItem(new Coca());
        return meal;
    }
    public Meal preparePepsi(){
        Meal meal = new Meal();
        meal.addItem(new Mcdonald());
        meal.addItem(new Pepsi());
        return meal;
    }
}
public class Test {
    public static void main(String[] args){
        MealBuilder mealBuilder = new MealBuilder();
        Meal meal = mealBuilder.prepareKFC();
        meal.showItem();
    }
}