帮忙看下下面的程序
import java.awt.*;
import java.awt.event.*;
class Mytuxing{
	private Frame f;
	Mytuxing(){
		tuxing();
	}
	private void tuxing(){
		f=new Frame();
		f.setBounds(300,300,300,300);
		Event();
		f.setVisible(true);
	}
	private void Event(){		
		f.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e){
				System.exit(0);
			}
		});
		f.addMouseListener(new MouseAdapter(){
			int x;
			int y;
			public void mousePressed(MouseEvent m){
				 x=m.getX();
				y=m.getY();
			}
public void mouseReleased(MouseEvent v){
				Graphics g=f.getGraphics();
				g.setColor(Color.red);
				 g.drawLine(x, y, v.getX(), v.getY());
			}
		});
	}
}
class Graphics {	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new Mytuxing();
	}
}
出现的问题是:
public void mouseReleased(MouseEvent v){
				Graphics g=f.getGraphics();
				g.setColor(Color.red);
				 g.drawLine(x, y, v.getX(), v.getY());
			}这段代码
运行提示是
Exception in thread "main" 
java.lang.Error: 无法解析的编译问题:
	类型不匹配:不能从 Graphics 转换为 Graphics
	没有为类型 Graphics 定义方法 setColor(Color)
	没有为类型 Graphics 定义方法 drawLine(int, int, int, int)
	at Mytuxing.Event(Graphics.java:39)
	at Mytuxing.tuxing(Graphics.java:13)
	at Mytuxing.<init>(Graphics.java:8)
	at Graphics.main(Graphics.java:57)
------解决方案--------------------
不要自己定义:
class Graphics {
跟java.awt.Graphics 重名了,结果把Java给整糊涂了