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桥接模式实例与解析 实例一:模拟毛笔

2021-04-12 21:10:27  阅读:28  来源: 互联网

标签:String 毛笔 桥接 void color 实例 public penType name


桥接模式实例与解析

  实例一:模拟毛笔

          现需要提供大中小3种型号的画笔,能够绘制5种不同颜色,如果使用蜡笔,我们需要准备3*5=15支蜡笔,也就是说必须准备15个具体的蜡笔类。而如果使用毛笔的话,只需要3种型号的毛笔,外加5个颜料盒,用3+5=8个类就可以实现15支蜡笔的功能。本实例使用桥接模式来模拟毛笔的使用过程。

 

public class BigPen extends Pen
{
	public void draw(String name)
	{
		String penType="大号毛笔绘制";
		this.color.bepaint(penType,name);			
	}	
}

 

public class Black implements Color
{
	public void bepaint(String penType,String name)
	{
		System.out.println(penType + "黑色的"+ name + ".");
	}
}

 

 

public class Blue implements Color
{
	public void bepaint(String penType,String name)
	{
		System.out.println(penType + "蓝色的"+ name + ".");
	}
}
public class Client
{
	public static void main(String a[])
	{
		Color color;
		Pen pen;
		
		color=(Color)XMLUtilPen.getBean("color");
		pen=(Pen)XMLUtilPen.getBean("pen");
		
		pen.setColor(color);
		pen.draw("鲜花");
	}
}
public interface Color
{
	void bepaint(String penType,String name);
}
public class Green implements Color
{
	public void bepaint(String penType,String name)
	{
		System.out.println(penType + "绿色的"+ name + ".");
	}
}
public class MiddlePen extends Pen
{
	public void draw(String name)
	{
		String penType="中号毛笔绘制";
		this.color.bepaint(penType,name);			
	}	
}
public abstract class Pen
{
	protected Color color;
	public void setColor(Color color)
	{
		this.color=color;
	}
	public abstract void draw(String name);
} 
public class Red implements Color
{
	public void bepaint(String penType,String name)
	{
		System.out.println(penType + "红色的"+ name + ".");
	}
}
public class SmallPen extends Pen
{
	public void draw(String name)
	{
		String penType="小号毛笔绘制";
		this.color.bepaint(penType,name);			
	}	
}
public class White implements Color
{
	public void bepaint(String penType,String name)
	{
		System.out.println(penType + "白色的"+ name + ".");
	}
}
import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.SAXException;
import java.io.*;
public class XMLUtilPen
{
//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(String args)
	{
		try
		{
			//创建文档对象
			DocumentBuilderFactory dFactory = DocumentBuilderFactory.newInstance();
			DocumentBuilder builder = dFactory.newDocumentBuilder();
			Document doc;							
			doc = builder.parse(new File("configPen.xml")); 
			NodeList nl=null;
			Node classNode=null;
			String cName=null;
			nl = doc.getElementsByTagName("className");
			
			if(args.equals("color"))
			{
				//获取包含类名的文本节点
	            classNode=nl.item(0).getFirstChild();
	            
			}
			else if(args.equals("pen"))
			{
			   //获取包含类名的文本节点
	            classNode=nl.item(1).getFirstChild();
			}
			
	         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configPen.xml


<?xml version="1.0"?>
<config>
    <className>Blue</className>
    <className>SmallPen</className>
</config>

 

标签:String,毛笔,桥接,void,color,实例,public,penType,name
来源: https://blog.csdn.net/bueke/article/details/115640512

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