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

class Program extends JFrame {
	JButton gomb;

	Program() {
		gomb = new JButton("Nyomj le!");

		gomb.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				setTitle("Lenyomták");
			}
		});
		
		add(gomb);
		setSize(200, 100);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setVisible(true);
	}
	public static void main(String[] args) {
		new Program();
	}

}