Set Accelerator for JRadioButtonMenuItem in Java

//from   w  w  w  . j av a2s  .com
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.KeyStroke;
import javax.swing.border.BevelBorder;

public class Main extends JPanel {
  public JMenuBar menuBar = new JMenuBar();
  public Main() {
    JMenu justifyMenu = new JMenu("Justify");
    ActionListener actionPrinter = new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        System.out.println("Action [" + e.getActionCommand()+ "] performed!\n");
      }
    };
    JRadioButtonMenuItem leftJustify = new JRadioButtonMenuItem("Left",new ImageIcon("1.gif"));
    leftJustify.setHorizontalTextPosition(JMenuItem.RIGHT);
    leftJustify.setAccelerator(KeyStroke.getKeyStroke('L', Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
    leftJustify.addActionListener(actionPrinter);
    JRadioButtonMenuItem rightJustify = new JRadioButtonMenuItem("Right",new ImageIcon("2.gif"));
    rightJustify.setHorizontalTextPosition(JMenuItem.RIGHT);
    rightJustify.setAccelerator(KeyStroke.getKeyStroke('R', Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
    rightJustify.addActionListener(actionPrinter);
    JRadioButtonMenuItem centerJustify = new JRadioButtonMenuItem("Center",new ImageIcon("3.gif"));
    centerJustify.setHorizontalTextPosition(JMenuItem.RIGHT);
    centerJustify.setAccelerator(KeyStroke.getKeyStroke('M', Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
    centerJustify.addActionListener(actionPrinter);
    JRadioButtonMenuItem fullJustify = new JRadioButtonMenuItem("Full",new ImageIcon("4.gif"));
    fullJustify.setHorizontalTextPosition(JMenuItem.RIGHT);
    fullJustify.setAccelerator(KeyStroke.getKeyStroke('F', Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
    fullJustify.addActionListener(actionPrinter);

    ButtonGroup group = new ButtonGroup();
    group.add(leftJustify);
    group.add(rightJustify);
    group.add(centerJustify);
    group.add(fullJustify);

    justifyMenu.add(leftJustify);
    justifyMenu.add(rightJustify);
    justifyMenu.add(centerJustify);
    justifyMenu.add(fullJustify);

    menuBar.add(justifyMenu);
    menuBar.setBorder(new BevelBorder(BevelBorder.RAISED));
  }

  public static void main(String s[]) {
    Main example = new Main();

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setJMenuBar(example.menuBar);
    frame.pack();
    frame.setVisible(true);
  }
}