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建造者模式的应用

实例：KFC套餐

建造者模式可以用于描述KFC如何创建套餐：套餐是一个复杂对象，它一般包含主食（如汉堡、鸡肉卷等）和饮料（如果汁、可乐等）等组成部分，不同的套餐有不同的组成部分，而KFC的服务员可以根据顾客的要求，一步一步装配这些组成部分，构造一份完整的套餐，然后返回给顾客。利用建造者模式设计，用JAVA语言实现 (或C#控制台应用程序实现)。绘制该模式的UML图。

【模式UML图】

package sdp.sy_3.builderpattern;//产品类：套餐――包括主食和饮料public class SetMeal {
   	String StapleFood;  //主食	String Dringks;   //饮料		public String getStapleFood() {
   		return StapleFood;	}	public void setStapleFood(String stapleFood) {
   		StapleFood = stapleFood;	}	public String getDringks() {
   		return Dringks;	}	public void setDringks(String dringks) {
   		Dringks = dringks;	}	}

// SetMealBuilder.java:

package sdp.sy_3.builderpattern;//抽象的Builder接口public abstract class SetMealBuilder {
   	SetMeal setMeal = new SetMeal();		public abstract void createStapleFood();	public abstract void createDrinks();		public SetMeal getSetMeal() {
   		return setMeal;	}	}

// SetMealBuilderA.java:

package sdp.sy_3.builderpattern;//套餐A：主食：汉堡+饮料：果汁public class SetMealBuilderA extends SetMealBuilder{
   	@Override	public void createStapleFood() {
   		setMeal.setStapleFood("Hamburger");	}	@Override	public void createDrinks() {
   		setMeal.setDringks("juice");	}	}

// SetMealBuilderB.java:

package sdp.sy_3.builderpattern;//套餐B：主食：鸡肉卷+饮料：可乐public class SetMealBuilderB extends SetMealBuilder{
   	@Override	public void createStapleFood() {
   		setMeal.setStapleFood("ChickenRolls");	}	@Override	public void createDrinks() {
   		setMeal.setDringks("Cola");	}}

// Director.java:

package sdp.sy_3.builderpattern;public class Director {
   	private SetMealBuilder setMealBuilder;		public Director(SetMealBuilder setMealBuilder) {
   		this.setMealBuilder = setMealBuilder;	}		public SetMeal construct() {
   		//准备主食		setMealBuilder.createStapleFood();		//准备饮料		setMealBuilder.createDrinks();		//返回一个套餐		return setMealBuilder.getSetMeal();	}}

// Client.java:

package sdp.sy_3.builderpattern;//建造者模式public class Client {
   	public static void main(String[] args) {
   		System.out.println("---------KFC套餐选择---------");				//建造套餐A		SetMealBuilder setMealABuilder = new SetMealBuilderA();		Director kfcDirector = new Director(setMealABuilder);		SetMeal kfcSetMealA = kfcDirector.construct();				System.out.println("套餐A：");		System.out.println("主食："+kfcSetMealA.getStapleFood()+" 饮料："+kfcSetMealA.getDringks());				//建造套餐B		SetMealBuilder setMealBBuilder = new SetMealBuilderB();		kfcDirector = new Director(setMealBBuilder);		SetMeal kfcSetMealB = kfcDirector.construct();				System.out.println("套餐B：");		System.out.println("主食："+kfcSetMealB.getStapleFood()+" 饮料："+kfcSetMealB.getDringks());			}}

【运行截图】

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