Add Mnemonic for JMenu in Java

//from w ww.j  av  a 2  s. c  o  m
import static java.awt.event.InputEvent.CTRL_DOWN_MASK;
import javax.swing.ButtonGroup;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.KeyStroke;
public class Main extends JFrame {
  private JMenuBar menuBar = new JMenuBar(); // Window menu bar
  private JMenuItem newItem, openItem, closeItem, saveItem, saveAsItem, printItem;
  private JRadioButtonMenuItem lineItem, rectangleItem, circleItem;
  private JCheckBoxMenuItem redItem, yellowItem;
  public Main(String title) {
    JMenu fileMenu = new JMenu("File"); // Create File menu
    JMenu elementMenu = new JMenu("Elements"); // Create Elements menu
    fileMenu.setMnemonic('F'); // Create shortcut
    elementMenu.setMnemonic('E'); // Create shortcut
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setJMenuBar(menuBar);
    newItem = fileMenu.add("New");
    openItem = fileMenu.add("Open");
    closeItem = fileMenu.add("Close");
    fileMenu.addSeparator();
    saveItem = fileMenu.add("Save");
    saveAsItem = fileMenu.add("Save As...");
    fileMenu.addSeparator();
    printItem = fileMenu.add("Print");
    elementMenu.add(lineItem = new JRadioButtonMenuItem("Line", true));
    elementMenu.add(rectangleItem = new JRadioButtonMenuItem("Rectangle", false));
    elementMenu.add(circleItem = new JRadioButtonMenuItem("Circle", false));
    ButtonGroup types = new ButtonGroup();
    types.add(lineItem);
    types.add(rectangleItem);
    types.add(circleItem);
    elementMenu.addSeparator();
    elementMenu.add(redItem = new JCheckBoxMenuItem("Red", false));
    elementMenu.add(yellowItem = new JCheckBoxMenuItem("Yellow", false));
    menuBar.add(fileMenu);
    menuBar.add(elementMenu);
    newItem.setAccelerator(KeyStroke.getKeyStroke('N', CTRL_DOWN_MASK));
    openItem.setAccelerator(KeyStroke.getKeyStroke('O', CTRL_DOWN_MASK));
    saveItem.setAccelerator(KeyStroke.getKeyStroke('S', CTRL_DOWN_MASK));
    printItem.setAccelerator(KeyStroke.getKeyStroke('P', CTRL_DOWN_MASK));
    lineItem.setAccelerator(KeyStroke.getKeyStroke('L', CTRL_DOWN_MASK));
    rectangleItem.setAccelerator(KeyStroke.getKeyStroke('E', CTRL_DOWN_MASK));
    circleItem.setAccelerator(KeyStroke.getKeyStroke('I', CTRL_DOWN_MASK));
    elementMenu.addSeparator();
    redItem.setAccelerator(KeyStroke.getKeyStroke('R', CTRL_DOWN_MASK));
    yellowItem.setAccelerator(KeyStroke.getKeyStroke('Y', CTRL_DOWN_MASK));
    menuBar.add(fileMenu);
    menuBar.add(elementMenu);
  }
  public static void main(String[] a) {
    Main window = new Main("");
    window.setBounds(30, 30, 300, 300);
    window.setVisible(true);
  }
}