一、类图

04_建造者模式_KFC套餐.jpg

二、实例代码 - KFC套餐

• 1/4_Product

package design.pattern.create.builder.kfc;

public class Meal {

    private String food;
    private String drink;

    public String getFood() {
        return food;
    }

    public void setFood(String food) {
        this.food = food;
    }

    public String getDrink() {
        return drink;
    }

    public void setDrink(String drink) {
        this.drink = drink;
    }

}

• 2/4_Builder

package design.pattern.create.builder.kfc;

public abstract class MealBuilder {

    protected Meal meal = new Meal();

    public abstract void buildFood();

    public abstract void buildDrink();

    public Meal getMeal() {
        return meal;
    }

}

• 3/4_ConcreteBuilder

package design.pattern.create.builder.kfc;

public class SubMealBuilderA extends MealBuilder {

    @Override
    public void buildFood() {
        meal.setFood("一个鸡堡");
    }

    @Override
    public void buildDrink() {
        meal.setDrink("一杯可乐");
    }

}

package design.pattern.create.builder.kfc;

public class SubMealBuilderB extends MealBuilder {

    @Override
    public void buildFood() {
        meal.setFood("一个鸡肉卷");
    }

    @Override
    public void buildDrink() {
        meal.setDrink("一杯果汁");
    }

}

• 4/4_Director

package design.pattern.create.builder.kfc;

public class KFCWaiter {

    private MealBuilder mealBuilder;

    public void setMealBuilder(MealBuilder mealBuilder) {
        this.mealBuilder = mealBuilder;
    }

    public Meal construct() {
        mealBuilder.buildFood();
        mealBuilder.buildDrink();
        return mealBuilder.getMeal();
    }

}

• 配置文件

<?xml version = "1.0"?>
<config>
    <classPath>design.pattern.create.builder.kfc.</classPath>
    <className>SubMealBuilderB</className>
</config>

• Client

package design.pattern.create.builder.kfc;

import design.pattern.util.XmlUtil;

public class Client {

    public static void main(String[] args) {
        String CONFIG_FILE = "design/pattern/create/builder/kfc/z_config.xml";

        try {
            MealBuilder mb = (MealBuilder)XmlUtil.getBean(CONFIG_FILE);
            KFCWaiter waiter = new KFCWaiter();
            waiter.setMealBuilder(mb);
            Meal meal = waiter.construct();

            System.out.println("套餐组成：");
            System.out.println(meal.getFood());
            System.out.println(meal.getDrink());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

输出

套餐组成：
一个鸡肉卷
一杯果汁