Codice della classe MyButtonFrame

package framebuttontest;

import java.awt.event.ActionEvent;

public class MyButtonFrame extends JFrame implements ActionListener {
	private static final long serialVersionUID = 1L;
	
	private JButton closeButton;

	public MyButtonFrame() {
		setTitle("Finestra con form di prova");

		closeButton = new JButton("Termina");
		closeButton.addActionListener(this);
		add(closeButton);
		pack();
	}

	@Override
	public void actionPerformed(ActionEvent evt) {
		if (evt.getSource() == closeButton) {
			dispose();
		}		
	} 
}