Java Swing | Creating a Toast Message

// Java program that creates the toast message
//(which is a selectively translucent JWindow)
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class toast extends JFrame {

    //String of toast
    String s;

    // JWindow
    JWindow w;

    toast(String s, int x, int y)
    {
        w = new JWindow();

        // make the background transparent
        w.setBackground(new Color(0, 0, 0, 0));

        // create a panel
        JPanel p = new JPanel() {
            public void paintComponent(Graphics g)
            {
                int wid = g.getFontMetrics().stringWidth(s);
                int hei = g.getFontMetrics().getHeight();

                // draw the boundary of the toast and fill it
                g.setColor(Color.black);
                g.fillRect(10, 10, wid + 30, hei + 10);
                g.setColor(Color.black);
                g.drawRect(10, 10, wid + 30, hei + 10);

                // set the color of text
                g.setColor(new Color(255, 255, 255, 240));
                g.drawString(s, 25, 27);
                int t = 250;

                // draw the shadow of the toast
                for (int i = 0; i < 4; i++) {
                    t -= 60;
                    g.setColor(new Color(0, 0, 0, t));
                    g.drawRect(10 - i, 10 - i, wid + 30 + i * 2,
                               hei + 10 + i * 2);
                }
            }
        };

        w.add(p);
        w.setLocation(x, y);
        w.setSize(300, 100);
    }

    // function to pop up the toast
    void showtoast()
    {
        try {
            w.setOpacity(1);
            w.setVisible(true);

            // wait for some time
            Thread.sleep(2000);

            // make the message disappear  slowly
            for (double d = 1.0; d > 0.2; d -= 0.1) {
                Thread.sleep(100);
                w.setOpacity((float)d);
            }

            // set the visibility to false
            w.setVisible(false);
        }
        catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

// Java Program to create a driver class to run 
// the toast class
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class driver extends JFrame implements ActionListener {

    // create a frame
    static JFrame f;

    // textfield
    static JTextField tf;

    public static void main(String args[])
    {
        // create the frame
        f = new JFrame("toast");

        driver d = new driver();

        // textfield
        tf = new JTextField(16);

        // button
        Button b = new Button("create");

        // add action listener
        b.addActionListener(d);

        // create a panel
        JPanel p = new JPanel();

        p.add(tf);
        p.add(b);

        // add panel
        f.add(p);

        // setSize
        f.setSize(500, 500);

        f.show();
    }

    // if button is pressed
    public void actionPerformed(ActionEvent e)
    {

        // create a toast message
        toast t = new toast(tf.getText(), 150, 400);

        // call the method
        t.showtoast();
    }
}