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                #建造者模式(Builder Pattern) ##簡介 生成器模式是一種對象構建模式。它可以將復雜對象的建造過程抽象出來(抽象類別),使這個抽象過程的不同實現方法可以構造出不同表現(屬性)的對象。 ###范例 ``` /** "Product" */ class Pizza { private String dough = ""; private String sauce = ""; private String topping = ""; public void setDough (String dough) { this.dough = dough; } public void setSauce (String sauce) { this.sauce = sauce; } public void setTopping (String topping) { this.topping = topping; } } ''/** "Abstract Builder" */'' abstract class PizzaBuilder { protected Pizza pizza; public Pizza getPizza() { return pizza; } public void createNewPizzaProduct() { pizza = new Pizza(); } public abstract void buildDough(); public abstract void buildSauce(); public abstract void buildTopping(); } /** "ConcreteBuilder" */ class HawaiianPizzaBuilder extends PizzaBuilder { public void buildDough() { pizza.setDough("cross"); } public void buildSauce() { pizza.setSauce("mild"); } public void buildTopping() { pizza.setTopping("ham+pineapple"); } } /** "ConcreteBuilder" */ class SpicyPizzaBuilder extends PizzaBuilder { public void buildDough() { pizza.setDough("pan baked"); } public void buildSauce() { pizza.setSauce("hot"); } public void buildTopping() { pizza.setTopping("pepperoni+salami"); } } ''/** "Director" */'' class Waiter { private PizzaBuilder pizzaBuilder; public void setPizzaBuilder (PizzaBuilder pb) { pizzaBuilder = pb; } public Pizza getPizza() { return pizzaBuilder.getPizza(); } public void constructPizza() { pizzaBuilder.createNewPizzaProduct(); pizzaBuilder.buildDough(); pizzaBuilder.buildSauce(); pizzaBuilder.buildTopping(); } } /** A customer ordering a pizza. */ class BuilderExample { public static void main(String[] args) { Waiter waiter = new Waiter(); PizzaBuilder hawaiian_pizzabuilder = new HawaiianPizzaBuilder(); PizzaBuilder spicy_pizzabuilder = new SpicyPizzaBuilder(); waiter.setPizzaBuilder ( hawaiian_pizzabuilder ); waiter.constructPizza(); Pizza pizza = waiter.getPizza(); } } ``` 抽象工廠模式與生成器相似,因為它也可以創建復雜對象。主要的區別是生成器模式著重于一步步構造一個復雜對象。而抽象工廠模式著重于多個系列的產品對象(簡單的或是復雜的)。生成器在最后的一步返回產品,而對于抽象工廠來說,產品是立即返回的。 ##實例 。 建造者模式包含如下角色: * Builder:抽象建造者 * ConcreteBuilder:具體建造者 * Director:指揮者 * Product:產品角色 ![builder](https://box.kancloud.cn/2016-05-02_57270f3aca11f.jpg) ###實序圖 ![builder](https://box.kancloud.cn/2016-05-02_57270f3adfe10.jpg) 建造者模式主要是用于創建一些復雜的對象,這些對象內部構建間的建造順序是穩定的,但是對象內部的構建通常面臨著復雜的變化。 建造者模式的好處就是使得建造代碼與表示代碼分離,由于建造者隱藏了改產品是如何組裝的,所以若需要改變一個產品的內部表示,只需要再定義一個具體的建造者就可以了。
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