One Man’s Walk in work

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
public class GlassPane extends JPanel {
	public void install(final RootPaneContainer rootPane) {
		final Component prevGlassPane = rootPane.getGlassPane();
		rootPane.setGlassPane(this);
 
		addMouseListener(new MouseAdapter() {
			public void mouseClicked(MouseEvent e) {
				Toolkit.getDefaultToolkit().beep();
			}
		});
		addFocusListener(new FocusAdapter() {
			public void focusLost(FocusEvent e) {
				requestFocus();
			}
		});
		addKeyListener(new KeyAdapter() {
			public void keyTyped(KeyEvent e) {
				Toolkit.getDefaultToolkit().beep();
			}
 
			public void keyPressed(KeyEvent e) {
				if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
					setVisible(false);
					rootPane.setGlassPane(prevGlassPane);
				}
			}
		});
 
		setOpaque(false);
		setVisible(true);
		repaint();
		requestFocus();
	}
 
	public void paint(Graphics g) {
		super.paint(g);
 
		g.setFont(new Font("Arial", Font.BOLD, 24));
		g.setColor(Color.blue);
 
		g.drawString("Glass!!!", 110, 140);
	}
 
	public static void main(String[] args) {
		final JFrame frame = new JFrame("GlassPane Test");
 
		JButton showButton = new JButton("Click here to show glass pane");
		showButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				new GlassPane().install(frame);
			}
		});
 
		frame.getContentPane().setLayout(new BorderLayout(10, 10));
		frame.getContentPane().add(BorderLayout.NORTH, new JTextField("TextField1"));
		frame.getContentPane().add(BorderLayout.CENTER, new JTextField("TextField2"));
		frame.getContentPane().add(BorderLayout.EAST, showButton);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(new Dimension(575, 300));
		frame.setVisible(true);
	}
}