工厂方法模式

继承简单工厂模式的优点，有弥补了他的缺点

暂时附上代码，以后慢慢完善

1.抽象产品类TV（电视机类）

package com.th.designedmodem;

public interface TV {
	public void play();
}

2.具体产品类HaierTV（海尔电视机类）

package com.th.designedmodem;

public class HaierTV implements TV {

	@Override
	public void play() {
		System.out.println("海尔电视机播放中。。。");
	}
}

package com.th.designedmodem;

public class HisenseTV implements TV {

	@Override
	public void play() {
		System.out.println("海信电视机播放中。。。。");
	}
}

package com.th.designedmodem;

public interface TVFactory {
	public TV produceTV();
}

package com.th.designedmodem;

public class HaierTVFactory implements TVFactory {

	@Override
	public TV produceTV() {
		System.out.println("海尔电视机工厂生产海尔电视机。。。。");
		return new HaierTV();
	}
}

package com.th.designedmodem;

public class HisenseTVFactory implements TVFactory {

	@Override
	public TV produceTV() {
		System.out.println("海信电视机工厂生产海信电视机。。。。");
		return new HisenseTV();
	}
}

package com.th.designedmodem;

import javax.xml.parsers.*;
import org.w3c.dom.*;
import java.io.*;

public class XMLUtil {
	public static Object getBean()
	{
		try
		{
			DocumentBuilderFactory dFactory = DocumentBuilderFactory.newInstance();
			DocumentBuilder builder = dFactory.newDocumentBuilder();
			Document doc;
			doc = builder.parse(new File("config.xml"));
			
			NodeList nl = doc.getElementsByTagName("className");
			Node classNode = nl.item(0).getFirstChild();
			String cName = classNode.getNodeValue().trim();
			
			Class c = Class.forName(cName);
			Object obj = c.newInstance();
			return obj;
		}
		catch (Exception e)
		{
			e.printStackTrace();
			return null;
		}
	}
}

package com.th.designedmodem;

public class Client {

	public static void main(String[] args) {
		try
		{
			TV tv;
			TVFactory factory;
			factory = (TVFactory) XMLUtil.getBean();
			tv = factory.produceTV();
			tv.play();
		}
		catch (Exception e)
		{
			System.out.println(e.getMessage());
			System.out.println("heheda");
		}
	}
}

<?xml version="1.0" ?>
<config>
	<className>
		com.th.designedmodem.HaierTVFactory
	</className>
</config>

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