SimpleAboutDialog

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class SimpleAboutDialog extends JDialog {
public SimpleAboutDialog(JFrame parent) {
super(parent, "About Dialog", true);

Box b = Box.createVerticalBox();
b.add(Box.createGlue());
b.add(new JLabel("Java source code, product and article"));
b.add(new JLabel("By Java source and support"));
b.add(new JLabel("At www.java2s.com"));
b.add(Box.createGlue());
getContentPane().add(b, "Center");

JPanel p2 = new JPanel();
JButton ok = new JButton("Ok");
p2.add(ok);
getContentPane().add(p2, "South");

ok.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
setVisible(false);
}
});

setSize(250, 150);
}

public static void main(String[] args) {
JDialog f = new SimpleAboutDialog(new JFrame());
f.show();
}
}