How to make a JWindow transparent

Question

hi
as my question describes i wants to make a transparent window. please help me. example code should be appreciated .
thanx in advance.

Answer 1

That's an imitation of the transparent window.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
public class Test {
    JScrollPane scroll;
    JPanel p=new JPanel(new BorderLayout());
    Robot robot=new Robot();
    public Test()  throws Exception {
        final TransparentFrame frame=new TransparentFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(p);
        JButton b=new JButton("Test");
        b.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
/*                TransparentFrame frame1=new TransparentFrame();
                frame1.setBounds(100,100,100,100);
                frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame1.setVisible(true);*/
        frame.getContentPane().add(new JLabel("Test"));
        frame.getContentPane().add(b);
        frame.setBounds(100,100,200,200);
        frame.show();
    public static void main(String[] args) throws Exception {
        new Test();
class TransparentFrame extends JFrame {
    Robot robot;
    BufferedImage screenImg;
    Rectangle screenRect;
    MyPanel contentPanel=new MyPanel();
    boolean userActivate=false;
    public TransparentFrame() {
        super();
        createScreenImage();
        this.setContentPane(contentPanel);
        this.addComponentListener(new ComponentAdapter() {
            public void componentHidden(ComponentEvent e) {}
            public void componentMoved(ComponentEvent e) {
                resetUnderImg();
                repaint();
            public void componentResized(ComponentEvent e) {
                resetUnderImg();
                repaint();
            public void componentShown(ComponentEvent e) {}
        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
            public void windowClosed(WindowEvent e) {
            public void windowOpened(WindowEvent e) {
            public void windowIconified(WindowEvent e) {
            public void windowDeiconified(WindowEvent e) {
            public void windowActivated(WindowEvent e) {
                if (userActivate) {
                    userActivate=false;
//                    boolean f=TransparentFrame.this.isShowing();
//                    if (f)
                        TransparentFrame.this.setVisible(false);
                    createScreenImage();
                    resetUnderImg();
//                    if (f)
                        TransparentFrame.this.setVisible(true);
                else {
                    userActivate=true;
            public void windowDeactivated(WindowEvent e) {
    protected void createScreenImage() {
        try {
            if (robot==null)
                robot=new Robot();
        catch (AWTException ex) {
            ex.printStackTrace();
        Dimension screenSize=Toolkit.getDefaultToolkit().getScreenSize();
        screenRect=new Rectangle(0,0,screenSize.width,screenSize.height);
        screenImg=robot.createScreenCapture(screenRect);
/*    public void show() {
        resetUnderImg();
        super.show();
    public void resetUnderImg() {
        if (robot!=null && screenImg!=null) {
            Rectangle frameRect=getBounds();
            int x=frameRect.x+4;
            contentPanel.paintX=0;
            contentPanel.paintY=0;
            if (x<0) {
                contentPanel.paintX=-x;
                x=0;
            int y=frameRect.y+23;
            if (y<0) {
                contentPanel.paintY=-y;
                y=0;
            int w=frameRect.width-10;
            if (x+w>screenImg.getWidth())
                w=screenImg.getWidth()-x;
            int h=frameRect.height-23-5;
            if (y+h>screenImg.getHeight())
                h=screenImg.getHeight()-y;
            contentPanel.underFrameImg=screenImg.getSubimage(x,y,w,h);
class MyPanel extends JPanel {
    BufferedImage underFrameImg;
    int paintX=0;
    int paintY=0;
    public MyPanel() {
        super();
        setOpaque(true);
    public void paint(Graphics g) {
        super.paint(g);
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(underFrameImg,paintX,paintY,null);
}