package dk.itu.oop.lecture3; import javax.swing.JFrame; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; public class DotFrame extends JFrame { public static void main(String[] args){ final DotFrame df = new DotFrame(); df.addMouseListener(new MouseAdapter(){ public void mouseClicked(MouseEvent e){ df.getGraphics().fillOval(e.getX()-5,e.getY()-5,10,10); } }); } public DotFrame(){ setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(400, 400); setTitle("DotFrame"); setVisible(true); } }