public class House {private String type = null;private List features = new ArrayList();public House() {}public House(String type) {this.type = type;}public void setType(String type) {this.type = type;}public String getType() {return type;}public void setProgress(String s) {features.add(s);}public String toString() {StringBuffer ff = new StringBuffer();String t = type.substring(6);ff.append(t + "\n ");int size =  features.size();for (int i = 0; i < size; i++) {ff.append(features.get(i) + "\n ");}return ff.toString();}
}

public class Skyscraper extends HouseBuilder {Skyscraper(String type){System.out.println("--Building the house "+ type);house.setType(this.getClass() +" :"+ type);}@Overridepublic void buildFoundation() {//doEngineering()//doExcavating()//doPlumbingHeatingElectricity()//doSewerWaterHookUp()//doFoundationInspection()house.setProgress("foundation is done");}@Overridepublic void buildFrame() {//doHeatingPlumbingRoof()//doElectricityRoute()//doDoorsWindows()//doFrameInspection()house.setProgress("frame is done");}@Overridepublic void buildExterior() {//doOverheadDoors()//doBrickWorks()//doSidingsoffitsGutters()//doDrivewayGarageFloor()//doDeckRail()//doLandScaping()house.setProgress("Exterior is waiting to start");}@Overridepublic void buildInterior() {//doBuiltinVacuum()//doInsulation()//doDryWall()//doPainting()//doLinoleum()//doCabinet()//doTileWork()//doLightFixtureBlinds()//doCleaning()//doInteriorInspection()house.setProgress("Interior is not started yet");}
}

定义一个房子构造抽象类HouseBuilder.java.

abstract class HouseBuilder {protected House house = new House();//show the building infoprotected String showProgress() {return house.toString();}abstract public void buildFoundation();abstract public void buildFrame();abstract public void buildExterior();abstract public void buildInterior();
}

构造启动类Workshop.java.

public class Workshop{public void construct(HouseBuilder builder){builder.buildFoundation();builder.buildFrame();builder.buildExterior();builder.buildExterior();}
}

测试这个构造模式，代码如下：

public class Builder {public static void main(String []args){System.out.println("---- Builder Pattern ---------");//initialize two house builder objectsHouseBuilder skyscraperOne = new Skyscraper("************Telnet");HouseBuilder skyscraperTwo = new Skyscraper("****************DongDu");//build the workspace for the projectWorkshop workshop = new Workshop();workshop.construct(skyscraperOne);workshop.construct(skyscraperTwo);//show the building informationSystem.out.println("---check the building-----");System.out.println(skyscraperOne.showProgress());System.out.println(skyscraperTwo.showProgress());}
}

结果如下：

---- Builder Pattern ---------
--Building the house ************Telnet
--Building the house ****************DongDu
---check the building-----
org.pattern.rationaljava.creationalpattern.Skyscraper :************Telnetfoundation is doneframe is doneExterior is waiting to startExterior is waiting to startorg.pattern.rationaljava.creationalpattern.Skyscraper :****************DongDufoundation is doneframe is doneExterior is waiting to startExterior is waiting to start