10例子24.txt

Java大学实用教程 耿祥义编著 课件 PPT

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Win extends JFrame implements MouseMotionListener
{  
    PointerInfo pi;
    Win()
    { 
      setTitle("你可以用鼠标拖动本窗体"); 
      addMouseMotionListener(this);
      setBounds(10,10,300,300);
      setVisible(true); 
      validate();
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    public void mouseMoved(MouseEvent e){} 
    public void mouseDragged(MouseEvent e)
    { 
       pi=MouseInfo.getPointerInfo();
       java.awt.Point point=pi.getLocation() ;
       int x=(int)point.getX();
       int y=(int)point.getY();
       int w=getSize().width;        //获取窗体的宽。
       int h=getSize().height;
       setLocation(x-w/2,y-h/2);     //窗体的中心跟随鼠标指针移动。      
       setTitle("("+x+","+y+")");    //窗体标题显示鼠标指针的坐标值。
    }
}
public class Example
{  public static void main(String args[])
    { 
       Win win=new Win();
    }
}