複雜物件的組裝與建立——建造者模式（二）

//Actor角色類：複雜產品，考慮到程式碼的可讀性，只列出部分成員屬性，且成員屬性的型別均為String，真實情況下，有些成員屬性的型別需自定義

class Actor

{

       private  String type; //角色型別

       private  String sex; //性別

       private  String face; //臉型

       private  String costume; //服裝

       private  String hairstyle; //髮型

       public  void setType(String type) {

              this.type  = type;

       }

       public  void setSex(String sex) {

              this.sex  = sex;

       }

       public  void setFace(String face) {

              this.face  = face;

       }

       public  void setCostume(String costume) {

              this.costume  = costume;

       }

       public  void setHairstyle(String hairstyle) {

              this.hairstyle  = hairstyle;

       }

       public  String getType() {

              return  (this.type);

       }

       public  String getSex() {

              return  (this.sex);

       }

       public  String getFace() {

              return  (this.face);

       }

       public  String getCostume() {

              return  (this.costume);

       }

       public  String getHairstyle() {

              return  (this.hairstyle);

       }

}

//角色建造器：抽象建造者

abstract class ActorBuilder

{

       protected  Actor actor = new Actor();

       public  abstract void buildType();

       public  abstract void buildSex();

       public  abstract void buildFace();

       public  abstract void buildCostume();

       public  abstract void buildHairstyle();

    //工廠方法，返回一個完整的遊戲角色物件

       public Actor createActor()

       {

              return actor;

       }

}

//英雄角色建造器：具體建造者

class HeroBuilder extends ActorBuilder

{

       public  void buildType()

       {

              actor.setType("英雄");

       }

       public  void buildSex()

       {

              actor.setSex("男");

       }

       public  void buildFace()

       {

              actor.setFace("英俊");

       }

       public  void buildCostume()

       {

              actor.setCostume("盔甲");

       }

       public  void buildHairstyle()

       {

              actor.setHairstyle("飄逸");

       }    

}

//天使角色建造器：具體建造者

class AngelBuilder extends ActorBuilder

{

       public  void buildType()

       {

              actor.setType("天使");

       }

       public  void buildSex()

       {

              actor.setSex("女");

       }

       public  void buildFace()

       {

              actor.setFace("漂亮");

       }

       public  void buildCostume()

       {

              actor.setCostume("白裙");

       }

       public  void buildHairstyle()

       {

              actor.setHairstyle("披肩長髮");

       }    

}

//惡魔角色建造器：具體建造者

class DevilBuilder extends ActorBuilder

{

       public  void buildType()

       {

              actor.setType("惡魔");

       }

       public  void buildSex()

       {

              actor.setSex("妖");

       }

       public  void buildFace()

       {

              actor.setFace("醜陋");

       }

       public  void buildCostume()

       {

              actor.setCostume("黑衣");

       }

       public  void buildHairstyle()

       {

              actor.setHairstyle("光頭");

       }    

}

//遊戲角色建立控制器：指揮者

class ActorController

{

    //逐步構建複雜產品物件

       public Actor construct(ActorBuilder ab)

       {

              Actor actor;

              ab.buildType();

              ab.buildSex();

              ab.buildFace();

              ab.buildCostume();

              ab.buildHairstyle();

              actor=ab.createActor();

              return actor;

       }

}

import javax.xml.parsers.*;

import org.w3c.dom.*;

import org.xml.sax.SAXException;

import java.io.*;

class XMLUtil

{

//該方法用於從XML配置檔案中提取具體類類名，並返回一個例項物件

       public  static Object getBean()

       {

              try

              {

                     //建立文件物件

                     DocumentBuilderFactory  dFactory = DocumentBuilderFactory.newInstance();

                     DocumentBuilder  builder = dFactory.newDocumentBuilder();

                     Document  doc;                                                

                     doc  = builder.parse(new File("config.xml"));

                     //獲取包含類名的文字節點

                     NodeList  nl = doc.getElementsByTagName("className");

            Node  classNode=nl.item(0).getFirstChild();

            String  cName=classNode.getNodeValue();

            //通過類名生成例項物件並將其返回

            Class c=Class.forName(cName);

                 Object obj=c.newInstance();

            return obj;

         }  

         catch(Exception e)

         {

              e.printStackTrace();

              return null;

          }

       }

}

<?xml version="1.0"?>

<config>

       <className>AngelBuilder</className>

</config>   

class Client

{

       public  static void main(String args[])

       {

              ActorBuilder ab; //針對抽象建造者程式設計

              ab =  (ActorBuilder)XMLUtil.getBean(); //反射生成具體建造者物件

         ActorController ac = new  ActorController();

              Actor actor;

              actor = ac.construct(ab); //通過指揮者建立完整的建造者物件

              String  type = actor.getType();

              System.out.println(type  + "的外觀：");

              System.out.println("性別：" + actor.getSex());

              System.out.println("面容：" + actor.getFace());

              System.out.println("服裝：" + actor.getCostume());

              System.out.println("髮型：" + actor.getHairstyle());

       }

}

天使的外觀：

性別：女

面容：漂亮

服裝：白裙

髮型：披肩長髮