Java JRadioButton MenuItem

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import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ItemEvent;
import java.awt.event.KeyEvent;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JRadioButtonMenuItem;

public class JavaJRadioButtonMenuItem extends JFrame {

	private JLabel statusbar;

	public JavaJRadioButtonMenuItem() {

		initUI();
	}

	private void initUI() {

		createMenuBar();

		statusbar = new JLabel("Easy");
		statusbar.setBorder(BorderFactory.createEtchedBorder());
		add(statusbar, BorderLayout.SOUTH);

		setTitle("JRadioButtonMenuItem");
		setSize(360, 250);
		setLocationRelativeTo(null);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
	}

	private void createMenuBar() {

		JMenuBar menubar = new JMenuBar();
		JMenu difMenu = new JMenu("Difficulty");
		difMenu.setMnemonic(KeyEvent.VK_F);

		ButtonGroup difGroup = new ButtonGroup();

		JRadioButtonMenuItem eaRMi = new JRadioButtonMenuItem("Easy");
		eaRMi.setSelected(true);
		difMenu.add(eaRMi);

		eaRMi.addItemListener((ItemEvent e) -> {
			if (e.getStateChange() == ItemEvent.SELECTED) {
				statusbar.setText("Easy");
			}
		});

		JRadioButtonMenuItem meRMi = new JRadioButtonMenuItem("Medium");
		difMenu.add(meRMi);

		meRMi.addItemListener((ItemEvent e) -> {
			if (e.getStateChange() == ItemEvent.SELECTED) {
				statusbar.setText("Medium");
			}
		});

		JRadioButtonMenuItem haRMi = new JRadioButtonMenuItem("Hard");
		difMenu.add(haRMi);

		haRMi.addItemListener((ItemEvent e) -> {
			if (e.getStateChange() == ItemEvent.SELECTED) {
				statusbar.setText("Hard");
			}
		});

		difGroup.add(eaRMi);
		difGroup.add(meRMi);
		difGroup.add(haRMi);

		menubar.add(difMenu);

		setJMenuBar(menubar);
	}

	public static void main(String[] args) {

		EventQueue.invokeLater(() -> {
			JavaJRadioButtonMenuItem ex = new JavaJRadioButtonMenuItem();
			ex.setVisible(true);
		});
	}
}
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