Java 深入理解创建型设计模式之建造者模式

package com.szh.builder;
 
public class House {
    private String basic;
    private String wall;
    private String roof;
 
    //setter and getter
}

package com.szh.builder;
 
//抽象的建造者
public abstract class HouseBuilder {
 
    protected House house = new House();
 
    //将建造的流程写好, 抽象的方法
    public abstract void buildBasic();
    public abstract void buildWall();
    public abstract void buildRoof();
 
    //建造房子好， 将产品(房子)返回
    public House buildHouse() {
        return house;
    }
 
}

package com.szh.builder;
 
public class CommonHouse extends HouseBuilder {
    @Override
    public void buildBasic() {
        System.out.println(" 普通房子打地基5m.... ");
    }
 
    @Override
    public void buildWall() {
        System.out.println(" 普通房子砌墙10cm.... ");
    }
 
    @Override
    public void buildRoof() {
        System.out.println(" 普通房子添加屋顶.... ");
    }
}

package com.szh.builder;
 
public class HighHouse extends HouseBuilder {
    @Override
    public void buildBasic() {
        System.out.println(" 高楼打地基100m.... ");
    }
 
    @Override
    public void buildWall() {
        System.out.println(" 高楼砌墙20cm.... ");
    }
 
    @Override
    public void buildRoof() {
        System.out.println(" 高楼添加透明屋顶.... ");
    }
}

package com.szh.builder;
 
//指挥者，这里去指定制作流程，返回产品
public class HouseDirector {
 
    HouseBuilder houseBuilder;
 
    //构造器传入 houseBuilder
    public HouseDirector(HouseBuilder houseBuilder) {
        this.houseBuilder = houseBuilder;
    }
 
    //通过setter传入 houseBuilder
    public void setHouseBuilder(HouseBuilder houseBuilder) {
        this.houseBuilder = houseBuilder;
    }
 
    //如何处理建造房子的流程，交给指挥者
    public House constructHouse() {
        houseBuilder.buildBasic();
        houseBuilder.buildWall();
        houseBuilder.buildRoof();
        return houseBuilder.buildHouse();
    }
}

package com.szh.builder;
 
public class MainTest {
    public static void main(String[] args) {
        //盖普通房子
        CommonHouse commonHouse = new CommonHouse();
        //准备创建房子的指挥者
        HouseDirector houseDirector = new HouseDirector(commonHouse);
        //完成盖房子，返回产品(普通房子)
        houseDirector.constructHouse();
 
        System.out.println("--------------------------");
 
        //盖高楼
        HighHouse highHouse = new HighHouse();
        //重置建造者
        houseDirector.setHouseBuilder(highHouse);
        //完成盖房子，返回产品(高楼)
        houseDirector.constructHouse();
    }
}