import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Hiir1 extends JPanel implements MouseListener{
   int px=100, py=50, pr=10;
   public Hiir1(){
      addMouseListener(this);
   }
   public void paintComponent(Graphics g){
      super.paintComponent(g);
      g.fillOval(px-pr, py-pr, 2*pr, 2*pr);
   }
   public void mousePressed(MouseEvent e){
      px=e.getX();
	  py=e.getY();
	  repaint();
   }
   public void mouseReleased(MouseEvent e){}
   public void mouseClicked(MouseEvent e){}
   public void mouseEntered(MouseEvent e){}
   public void mouseExited(MouseEvent e){}
   public static void main(String[] arg){
      JFrame f=new JFrame();
	  f.getContentPane().add(new Hiir1());
	  f.setSize(400, 300);
	  f.setVisible(true);
   }
}