java设计模式：生成器模式实践练习---加深理解

　　题目：某公司要设计一个房屋选购系统，房屋有两种类型：普通型和豪华型。不同房屋体现在面积大小以及卧室、卫生间、车库的数量上。利用生成器模式编制功能类和测试类。 

分析：所需要的类有House类，生成器IBuilder接口类，普通房子生成类BuilderImplP,豪华房子生成类BuilderImplS,指挥生产Director类，最后一个测试类Test。

代码如下：

1.House.java

package com.Mark.chapter04.生成器.ToUnderstand.chapter04.exercise;

public class House
{
　　　　//为了更好理解，就简单定义这些属性　　　　
    public int area;
    public int sleeping;
    public int toliet;
    public int carNum;
}

2.IBuilder接口

package com.Mark.chapter04.生成器.ToUnderstand.chapter04.exercise;

public interface IBuilder
{    
    //因为是接口，所以方法的实现要交给他不同的实现类，实现不同的方法.
    public void createArea();
    public void createSleeping();
    public void createCarNum();
    public void createToliet();
    public House createHouse();
}

3.建造普通房子BuilderImplP类

package com.Mark.chapter04.生成器.ToUnderstand.chapter04.exercise;

public class BuilderImplP implements IBuilder
{
    private House house;
    public BuilderImplP(House house)
    {
        this.house=house;
    }
    @Override
    public void createArea()
    {
        house.area=1;            //这些属性值并未用到，这里只是起到方便理解作用，就假定认为已经用到了这些属性。
        System.out.println("平民房就一平米哦！");
    }

    @Override
    public void createSleeping()
    {
        house.sleeping=1;
        System.out.println("平民房就一个卧室哦！");
    }

    @Override
    public void createCarNum()
    {
        house.carNum=0;
        System.out.println("平民房可是没有车库的哦！");
    }

    @Override
    public void createToliet()
    {
        house.toliet=1;
        System.out.println("平民房就一个厕所！");
    }

    @Override
    public House createHouse()
    {
        System.out.println("建造一个平民房！");
        createArea();
        createCarNum();
        createSleeping();
        createToliet();
        return house;
    }
}

4.建造豪华房BuildImplS

package com.Mark.chapter04.生成器.ToUnderstand.chapter04.exercise;

public class BuilderImplS implements IBuilder
{
    private House house;
    public BuilderImplS(House house)
    {
        this.house=house;
    }
    @Override
    public void createArea()
    {
        house.area=100;
        System.out.println("土豪房子可是不一样的大100平！");
    }

    @Override
    public void createSleeping()
    {
        house.sleeping=5;
        System.out.println("土豪房有5张床！");
    }

    @Override
    public void createCarNum()
    {
        house.carNum=666;
        System.out.println("土豪房子车库数不清！");
    }

    @Override
    public void createToliet()
    {
        house.toliet=666;
        System.out.println("土豪房子厕所大大的！");
    }

    @Override
    public House createHouse()
    {
        System.out.println("土豪房子建好啦！");
        createArea();
        createCarNum();
        createSleeping();
        createToliet();
        return house;
    }
}

5.指挥建造Director

package com.Mark.chapter04.生成器.ToUnderstand.chapter04.exercise;

public class Director
{
    private IBuilder iBuilder;
    public Director(IBuilder iBuilder)
    {
        this.iBuilder=iBuilder;
    }
    public void build()
    {
        iBuilder.createHouse();
    }

}

6.测试Test

package com.Mark.chapter04.生成器.ToUnderstand.chapter04.exercise;

public class Test
{
    public static void main(String[] args)
    {
        House house = new House();
//        普通房
        IBuilder iBuilder1=new BuilderImplP(house);
        Director director1=new Director(iBuilder1);
        director1.build();

        System.out.println("");
//        土豪房
        IBuilder iBuilder2=new BuilderImplS(house);
        Director director2=new Director(iBuilder2);
        director2.build();

    }
}

输出结果：

建造一个平民房！
平民房就一平米哦！
平民房可是没有车库的哦！
平民房就一个卧室哦！
平民房就一个厕所！

土豪房子建好啦！
土豪房子可是不一样的大100平！
土豪房子车库数不清！
土豪房有5张床！
土豪房子厕所大大的！

配合这篇教学可以更加深刻的理解：生成器模式实例——更通俗易懂的去理解生成器模式