1.产品接口，电视和空调

public interface Television // 电视接口{    public void play();}

public interface AirConditioner // 空调{    public void changeTemperature();}

2.电子工厂接口，生产电视和空调

public interface EFactory //E工厂接口{    public Television produceTelevision(); // 生产电视    public AirConditioner produceAirConditioner(); // 生产空调}

3.具体工厂

海尔工厂生产海尔电视和海尔空调

public class HaierFactory implements EFactory // 海尔工厂{    public Television produceTelevision()    {        return new HaierTelevision();    }        public AirConditioner produceAirConditioner()    {        return new HairAirConditioner();    }}

TCL工厂生产TCL电视和TCL空调

public class TCLFactory implements EFactory // TCL工厂{    public Television produceTelevision()    {        return new TCLTelevision();    }        public AirConditioner produceAirConditioner()    {        return new TCLAirConditioner();    }}

4.具体产品，海尔电视，海尔空调

public class HaierTelevision implements Television  // 海尔电视{    public void play()    {        System.out.println("海尔电视机播放中......");    }}

public class HairAirConditioner implements AirConditioner // 海尔空调{    public void changeTemperature()    {        System.out.println("海尔空调温度改变中......");    }}

TCL电视，TCL空调

public class TCLTelevision implements Television // TCL电视{    public void play()    {        System.out.println("TCL电视机播放中......");    }}

public class TCLAirConditioner implements AirConditioner // TCL空调{    public void changeTemperature()    {        System.out.println("TCL空调温度改变中......");    }}

5.配置与获取配置类

    
        
     
      TCLFactory
     
    

import javax.xml.parsers.*;import org.w3c.dom.*;import org.xml.sax.SAXException;import java.io.*;public class XMLUtil{//该方法用于从XML配置文件中提取具体类类名，并返回一个实例对象    public static Object getBean()    {        try        {            //创建文档对象            DocumentBuilderFactory dFactory = DocumentBuilderFactory.newInstance();            DocumentBuilder builder = dFactory.newDocumentBuilder();            Document doc;                                       doc = builder.parse(new File("./src/config.xml"));                    //获取包含类名的文本节点            NodeList nl = doc.getElementsByTagName("className");            Node classNode=nl.item(0).getFirstChild();            String cName=classNode.getNodeValue();                        //通过类名生成实例对象并将其返回            Class c=Class.forName(cName);            Object obj=c.newInstance();            return obj;           }               catch(Exception e)            {                e.printStackTrace();                return null;            }        }}

6.客户端调用

public class Client{    public static void main(String args[])    {         try         {            EFactory factory; // 电子工厂            Television tv; // TV            AirConditioner ac; // 空调            factory=(EFactory)XMLUtil.getBean();                // factory = new HaierFactory();                // factory = new TCLFactory();            tv=factory.produceTelevision(); // 工厂生产电视            tv.play(); // 电视播放            ac=factory.produceAirConditioner(); // 工厂生产空调            ac.changeTemperature(); // 空调调节温度         }         catch(Exception e)         {            System.out.println(e.getMessage());         }    }}

结果：

TCL电视机播放中......

TCL空调温度改变中......

类图关系如下，