Java-Buddy

package javaswingdrawing;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaSwingDrawing extends JComponent {
 
 int mouseX, mouseY;
 public static void main(String[] args) {
 SwingUtilities.invokeLater(() -> {
 createAndShowGUI();
 });
 }
 public JavaSwingDrawing() {
 addMouseListener(myMouseAdapter);
 }
 
 MouseAdapter myMouseAdapter = new MouseAdapter(){
 @Override
 public void mousePressed(MouseEvent e) {
 mouseX = e.getX();
 mouseY = e.getY();
 repaint();
 }
 };
 @Override
 public void paint(Graphics g) {
 
 Graphics2D graphics2d = (Graphics2D)g;
 graphics2d.setColor(Color.blue);
 graphics2d.fillOval(mouseX-5, mouseY-5, 10, 10);
 }
 private static void createAndShowGUI() {
 JFrame myFrame = new JFrame();
 myFrame.setTitle("java-buddy.blogspot.com");
 myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 myFrame.setSize(new Dimension(400, 300));
 myFrame.setLayout(new BorderLayout());
 myFrame.add(new JavaSwingDrawing(), BorderLayout.CENTER);
 myFrame.setVisible(true);
 }
}