Translucency test

translucency.java

package main.java;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;

public class Main extends JFrame {

    public static final String NOT_SUPPORTED_ERR_MSG = "Translucency is not supported";
    public static final String PROGRAM_TITLE = "Translucency demo";

    public static void main(String[] args) throws ClassNotFoundException, UnsupportedLookAndFeelException, InstantiationException, IllegalAccessException {
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice gd = ge.getDefaultScreenDevice();

        if (!gd.isWindowTranslucencySupported(GraphicsDevice.WindowTranslucency.TRANSLUCENT)) {
            System.err.println(NOT_SUPPORTED_ERR_MSG);
            System.exit(0);
        }

        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                Main tw = new Main();
                addEscapeListener(tw);
                tw.setVisible(true);
            }
        });
    }

    private Main() {
        super(PROGRAM_TITLE);
        Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setLayout(new BorderLayout());
        setLocation(0, 0);
        setSize(dim);
        setUndecorated(true);
        setBackground(new Color(0, 0, 0, 210));

        JButton asd = new JButton("asd");
        asd.setPreferredSize(new Dimension(80, 30));

        JPanel buttonPane = new JPanel();
        buttonPane.setBackground(new Color(0, 0, 0, 0));
        buttonPane.add(asd);

        add(buttonPane, BorderLayout.SOUTH);
    }

    private static void addEscapeListener(final JFrame frame) {
        ActionListener escListener = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        };

        frame.getRootPane().registerKeyboardAction(escListener, KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), JComponent.WHEN_IN_FOCUSED_WINDOW);
    }

}