Simple Swing application

Main.java

package be.vub;

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

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main {
	/**
	 * Starts the main GUI window
	 */
	public static void main(String[] args) {
		javax.swing.SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				// Setup the application's window
				JFrame frame = new JFrame("Swing Text Editor");
				frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
				
				// Setup the content pane
				JPanel contentPane = new JPanel();
				contentPane.setLayout(new BorderLayout());
				frame.setContentPane(contentPane);
				
				// Add a button to the content pane
				final JButton button = new JButton("Click here");
				contentPane.add(button, BorderLayout.CENTER);
				
				button.addActionListener(new ActionListener() {
					public void actionPerformed(ActionEvent e) {
						button.setText("Clicked");
					}
				});
				
				// Display the window
				frame.pack();
				frame.setSize(640, 480);
				frame.setLocationRelativeTo(null);
				frame.setVisible(true);
			}
		});
	}
}