Java Swing How to - Handle JCheckBoxMenuItem event ItemListener

Question

We would like to know how to handle JCheckBoxMenuItem event ItemListener.
Answer

//w  w  w.  java  2  s . c  o  m

import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyEvent;

import javax.swing.AbstractButton;
import javax.swing.Icon;
import javax.swing.ImageIcon;
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("MenuSample Example");
    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);

    ItemListener iListener = new ItemListener() {
      public void itemStateChanged(ItemEvent event) {
        Icon girlIcon = new ImageIcon("girl-r.jpg");
        Icon boyIcon = new ImageIcon("boy-r.jpg");
        AbstractButton aButton = (AbstractButton)event.getSource();
        int state = event.getStateChange();
        String newLabel;
        Icon newIcon;
        if (state == ItemEvent.SELECTED) {
          newLabel = "Girl";
          newIcon = girlIcon;
        } else {
          newLabel = "Boy";
          newIcon = boyIcon;
        }
        aButton.setText(newLabel);
        aButton.setIcon(newIcon);
      }
    };

    caseMenuItem.addItemListener(iListener);
    frame.setJMenuBar(menuBar);
    frame.setSize(350, 250);
    frame.setVisible(true);
  }
}