使用java applet语言，画出一个椭圆，鼠标的按压和释放确定椭圆的左上角和右下角。

package sdfgvw;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class AppletOval2 extends JApplet
{
private int x, y, h, w;
public void init()
{
addMouseListener(new getPoint());
}
public void paint(Graphics g)
{
g.drawOval(x,y,w,h);
}
class getPoint extends MouseAdapter
{
public void mousePressed(MouseEvent e)
{
x = e.getX();
y = e.getY();
}
public void mouseReleased(MouseEvent e)
{
w = e.getX() - x;
h = e.getY() - y;
getGraphics().clearRect(getX(),getY(),getWidth(),getHeight());
repaint();
}
}