CircleListener.java A subclass of MouseAdapter that draws a circle wherever mouse was pressed. Illustrates first approach to event-handling with listeners: attaching a separate listener
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import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
/** The listener used by CircleDrawer1. Note call
* to getSource to obtain reference to the applet.
*
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public class CircleListener extends MouseAdapter {
private int radius = 25;
public void mousePressed(MouseEvent event) {
Applet app = (Applet)event.getSource();
Graphics g = app.getGraphics();
g.fillOval(event.getX()-radius,
event.getY()-radius,
2*radius,
2*radius);
}
}
