class MyPanel extends Panel implements MouseMotionListener{ // 实现监听接口 重写 相应的方法
int x = 30 ;
int y = 30 ;
public void paint(Graphics g){
g.fillOval(x, y, 20, 20) ;
}
@Override
public void mouseDragged(MouseEvent arg0) {
// 鼠标拖动
x = arg0.getX() ;
y = arg0.getY() ;
repaint() ;
}
@Override
public void mouseMoved(MouseEvent arg0) {
// TODO Auto-generated method stub