Java JButton Listener

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class JavaJButtonListner {

	static JFrame frame;

	public static void main(String[] args) {
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				displayJFrame();
			}
		});
	}

	static void displayJFrame() {
		frame = new JFrame("Our JButton listener example");

		JButton showDialogButton = new JButton("Click Me");
		showDialogButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {

				JDialog d = new JDialog(frame, "Hello", true);
				d.setLocationRelativeTo(frame);
				d.setVisible(true);
			}
		});

		frame.getContentPane().setLayout(new FlowLayout());
		frame.add(showDialogButton);
		frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
		frame.setPreferredSize(new Dimension(300, 200));
		frame.pack();
		frame.setLocationRelativeTo(null);
		frame.setVisible(true);
	}
}
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