Java Swing How to - Handle JCheckBoxMenuItem Events with an ActionListener

Question

We would like to know how to handle JCheckBoxMenuItem Events with an ActionListener.
Answer

  /*from w  ww  .  j ava  2 s .c  om*/
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;

import javax.swing.AbstractButton;
import javax.swing.Icon;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;

public class JCheckBoxMenuItemActionListener {

  public static void main(final String args[]) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JMenuBar menuBar = new JMenuBar();

    // File Menu, F - Mnemonic
    JMenu fileMenu = new JMenu("File");
    fileMenu.setMnemonic(KeyEvent.VK_F);
    menuBar.add(fileMenu);

    // File->New, N - Mnemonic
    JMenuItem newMenuItem = new JMenuItem("New", KeyEvent.VK_N);
    fileMenu.add(newMenuItem);

    JCheckBoxMenuItem caseMenuItem = new JCheckBoxMenuItem("Case Sensitive");
    caseMenuItem.setMnemonic(KeyEvent.VK_C);
    fileMenu.add(caseMenuItem);

    ActionListener aListener = new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        AbstractButton aButton = (AbstractButton) event.getSource();
        boolean selected = aButton.getModel().isSelected();
        String newLabel;
        Icon newIcon;
        if (selected) {
          newLabel = "A";
        } else {
          newLabel = "B";
        }
        aButton.setText(newLabel);
      }
    };

    caseMenuItem.addActionListener(aListener);
    frame.setJMenuBar(menuBar);
    frame.setSize(350, 250);
    frame.setVisible(true);
  }
}