设计模式 -- 建造者模式（ Builder Pattern）

建造者模式

• Separate the construction of a complex object from its representation so that the same construction process can create different representations.（ 将一个复杂对象的构建与它的表示分离， 使得同样的构建过程可以创建不同的表示。 ）
• 参考：https://github.com/BaliStarDUT/hello-world/tree/master/code/Design-Patterns/builder-pattern

public class BuilderPatternDemo {
  public static void main(String[] args) {
    MealBuilder mealBuilder = new MealBuilder();

    Meal vegMeal = mealBuilder.prepareVegMeal();
    System.out.println("Veg Meal");
    vegMeal.showItems();
    System.out.println("Total Cost: " +vegMeal.getCost());

    Meal nonVegMeal = mealBuilder.prepareNonVegMeal();
     System.out.println("\n\nNon-Veg Meal");
     nonVegMeal.showItems();
     System.out.println("Total Cost: " +nonVegMeal.getCost());

  }
}