How to paint over components in JWindow?

Question

Hi,
Need to know if its possible to draw some lines over components in a JFrame or JWindow.
Im writng a GUI for an mp3 player and one of the effects is to create scanlines over the Logo and Components (play, pause, etc)
Heres what I'm trying to do:
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import javax.swing.*;
import java.awt.geom.Line2D;
public class PLUSGUI extends JWindow {
     public PLUSGUI() {
          //super("+ PLUS-GUI");
          Container c = this.getContentPane();
          c.setBackground(Color.lightGray);
          this.setLayout(new FlowLayout());
          ClassLoader cldr = this.getClass().getClassLoader();
          java.net.URL imageURL   = cldr.getResource("+PLUS_Logo.jpg");
          ImageIcon PLUSLOGO = new ImageIcon(imageURL);
          this.add(new JLabel(PLUSLOGO));
          //this.add(new JButton("test"));
          //this.add(new JCheckBox("test"));
          //this.add(new JRadioButton("test"));
          this.add(new JProgressBar(0, 100));
          this.setSize(new Dimension(300, 300));
          this.setLocationRelativeTo(null);
          //this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          //this.setUndecorated(true);
public void paint(Graphics g){
   Graphics2D g2 = (Graphics2D) g;
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
//Draw the logo
//g2.setPaint(Color.ORANGE);
//g2.drawString("+ PLUS GUI", 50, 51);
int x = 0;
int y = 0;
int w = 300;
int h = 0;
for (int i=0; i<150; i++){
   g2.setColor(Color.GRAY);
   g2.draw(new Line2D.Double(x, y, w, h));
   y=y+2;
   h=h+2;
     public static void main(String[] args) {
          //JFrame.setDefaultLookAndFeelDecorated(true);
          SwingUtilities.invokeLater(new Runnable() {
               @Override
               public void run() {
                    Window w = new PLUSGUI();
                    w.setVisible(true);
                    //com.sun.awt.AWTUtilities.setWindowOpacity(w, 0.5f);
                    com.sun.awt.AWTUtilities
                              .setWindowShape(w, new RoundRectangle2D.Float(0, 0, w.getWidth(), w.getHeight(), 10, 10));
}

Answer 1

Custom painting is done by overriding the paintComponent(g) method of a Swing component that is not a top level container.
You should never override the paint() method of a top level container (like JFrame, JWindow) espcially when you don't invoke super.paint(...).
So if you want line above the label, then overide the label and add the custom code.
Also, use proper Java naming convention. Class names and variable name should not be completely capitalized.