实例一：电器工厂 一个电器工厂可以产生多种类型的电器，如海尔工厂可以生产海尔电视机、海尔空调等，TCL工厂可以生产TCL电视机、TCL空调等，相同品牌的电器构成一个产品族，而相同类型的电器构成了一个产品等级结构，现使用抽象工厂模式模拟该场景。

接口AirConditioner类：

public interface AirConditioner
{
	public void changeTemperature();
}

客户端类client：
public class Client
{
	public static void main(String args[])
	{
         try
         {
         	EFactory factory;
         	Television tv;
         	AirConditioner ac;
         	factory=(EFactory)XMLUtil.getBean();
         	tv=factory.produceTelevision();
         	tv.play();
         	ac=factory.produceAirConditioner();
         	ac.changeTemperature();
         }
         catch(Exception e)
         {
         	System.out.println(e.getMessage());
         }
	}
}

EFactory类：
public interface EFactory
{
	public Television produceTelevision();
	public AirConditioner produceAirConditioner();
}

HaierFactory 类：
public class HaierFactory implements EFactory
{
	public Television produceTelevision()
	{
		return new HaierTelevision();
	}
	
	public AirConditioner produceAirConditioner()
	{
		return new HairAirConditioner();
	}
}

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

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

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

TCLFactory 类：
public class TCLFactory implements EFactory
{
	public Television produceTelevision()
	{
		return new TCLTelevision();
	}
	
	public AirConditioner produceAirConditioner()
	{
		return new TCLAirConditioner();
	}
}

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

Television接口：
public interface Television
{
	public void play();
}

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("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;
           	}
		}
}

配置文件：config.xml

<?xml version="1.0"?>
<config>
	<className>HaierFactory</className>
</config>