Anonymous

import javax.swing.*;public class Helloworld {	public static void main(String[] args) 	{		JFrame f = new JFrame("Hello world");		JPanel panel = new JPanel();		JButton button = new JButton("Press me!");		button.addActionListener(new ActionListener())		{			public void actionPerformed(ActionEvent event)			{				System.out.println("You pressed me!");			}		}		panel.add(button);		f.add(panel);		f.pack();		f.show(true);	}}