mouseeventdemo1.java

一个GUI编程的例子 一个GUI编程的例子

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class MouseEventDemo1 extends JApplet{
public void init(){
addMouseListener(new CircleListener());
setForeground(Color.blue);
setBackground(Color.white);
}
}
class CircleListener extends MouseAdapter {
private int radius = 10;
public void mousePressed(MouseEvent e) {
JApplet app = (JApplet)e.getSource();
Graphics g = app.getGraphics();
g.fillOval(e.getX()-radius,e.getY()-radius,2*radius,2*radius);
}
}