Java SE (Java Platform, Standard Edition)

the following code change the title bar color of JDialog box but also show dots of default Title bar color

       JDialog.setDefaultLookAndFeelDecorated(true);
      UIManager.put("activeCaption", new ColorUIResource(Color.RED));

complete Code

import java.awt.*;
import javax.swing.Icon;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JInternalFrame;
import javax.swing.UIManager;
import javax.swing.plaf.ColorUIResource;
import javax.swing.plaf.metal.MetalInternalFrameTitlePane;
import javax.swing.plaf.metal.MetalInternalFrameUI;
/**
 *
 * @author muneer.ahmed
 */
public class NewJDialog extends javax.swing.JDialog {

    /** Creates new form NewJDialog */
    public NewJDialog(java.awt.Frame parent, boolean modal) {
        super(parent, modal);
        initComponents();
        
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
      JDialog.setDefaultLookAndFeelDecorated(true);
      UIManager.put("activeCaption", new ColorUIResource(Color.RED));
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                NewJDialog dialog = new NewJDialog(new javax.swing.JFrame(), true);
                dialog.addWindowListener(new java.awt.event.WindowAdapter() {
                    public void windowClosing(java.awt.event.WindowEvent e) {
                        System.exit(0);
                    }
                });
                dialog.setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    // End of variables declaration

     class ColorTitlebarInternalFrameUI extends MetalInternalFrameUI {

        JInternalFrame frame1 = null;

        ColorTitlebarInternalFrameUI(JInternalFrame jif) {
            super(jif);
            frame1 = jif;
        }

        protected JComponent createNorthPane(JInternalFrame jif) {

            MetalInternalFrameTitlePane titlePane = new MetalInternalFrameTitlePane(jif) {

                @Override
                public void paintComponent(Graphics g) {
                    //super.paintComponent (g);

                    Graphics2D g2 = (Graphics2D) g;
                    g2.setBackground(new Color(getBackground().getRGB() | 0x01000000));
                    g2.clearRect(0, 0, getWidth(), getHeight());

                    g.setColor(getForeground());
                    g.drawRect(0, 0, getWidth() - 1, getHeight() - 1);

                    int titleLength = 0;
                    int xOffset = 5;
                    String frameTitle = frame1.getTitle();

                    Icon icon = frame1.getFrameIcon();
                    if (icon != null) {
                        int iconY = ((getHeight() / 2) - (icon.getIconHeight() / 2));
                        icon.paintIcon(frame1, g, xOffset, iconY);
                        xOffset += icon.getIconWidth() + 5;
                    }

                    if (frameTitle != null) {
                        Font f = getFont();
                        g.setFont(f);
                        FontMetrics fm = getFontMetrics(getFont());
                        int fHeight = fm.getHeight();
                        int yOffset = ((getHeight() - fm.getHeight()) / 2) + fm.getAscent();

                        Rectangle rect = new Rectangle(0, 0, 0, 0);
                        if (frame1.isIconifiable()) {
                            rect = iconButton.getBounds();
//                        } else if (frame1.isMaximizable()) {
//                            rect = maxButton.getBounds();
                        } else if (frame1.isClosable()) {
                            rect = closeButton.getBounds();
                        }
                        int titleW;

                        if (rect.x == 0) {
                            rect.x = frame.getWidth() - frame.getInsets().right - 2;
                        }
                        titleW = rect.x - xOffset - 4;
                        frameTitle = getTitle(frameTitle, fm, titleW);

                        titleLength = fm.stringWidth(frameTitle);
                        g2.drawString(frameTitle, xOffset, yOffset);
                        xOffset += titleLength + 5;
                    }
                }
            };
            return titlePane;
        }
    }
}