Displaying split menu containing check boxes in struts

Question

How to display a split menu containing check boxes ,in the first a list of all families should be displayed and when we click on a family ,then in the second menu it should display list of check boxes of all the members . If the check box of a family is checked then all members of that family have to be in checked state .

Answer 1

* Menu_Demo.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Menu_Demo extends JFrame {
    public Menu_Demo() {
        initComponents();
    private void initComponents() {
        setTitle("Menu Demo");
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setSize(400,300);
        setLocationRelativeTo(null);
        //create menu components
        menubar = new JMenuBar();
        families = new JMenu();
        family1Select = new JCheckBoxMenuItem();
        family2Select = new JCheckBoxMenuItem();
        members = new JMenu();
        family1 = new JMenu();
        member11 = new JCheckBoxMenuItem();
        member12 = new JCheckBoxMenuItem();
        family2 = new JMenu();
        member21 = new JCheckBoxMenuItem();
        member22 = new JCheckBoxMenuItem();
        //init families menu
        ItemListener listener = new ItemListener() {
            public void itemStateChanged(ItemEvent evt) {
                familyStateChanged(evt);
        families.setText("Families");
        family1Select.setText("Family 1");
        family1Select.addItemListener(listener);
        families.add(family1Select);
        family2Select.setText("Family 2");
        family2Select.addItemListener(listener);
        families.add(family2Select);
        menubar.add(families);
        //init family members menu
        members.setText("Members");
        family1.setText("Family 1");
        family1.setVisible(false);
        member11.setText("Member 11");
        family1.add(member11);
        member12.setText("Member 12");
        family1.add(member12);
        members.add(family1);
        family2.setText("Family 2");
        family2.setVisible(false);
        member21.setText("Member 21");
        family2.add(member21);
        member22.setText("Member 22");
        family2.add(member22);
        members.add(family2);
        members.setEnabled(false);
        menubar.add(members);
        setJMenuBar(menubar);
    private void familyStateChanged(ItemEvent evt) {
        JCheckBoxMenuItem family = (JCheckBoxMenuItem)evt.getSource();
        //find corresponding family members menu
        JMenu familyMembers = null;
        if( family.getText().equalsIgnoreCase("Family 1") ){
            familyMembers = family1;
        }else{
            familyMembers = family2;
        //set visiblility and selection
        boolean selection = family.isSelected();
        familyMembers.setVisible( selection );
        Component[] membersArray = familyMembers.getMenuComponents();
        for( int i=0; i<membersArray.length; i++ ){
            ((JCheckBoxMenuItem)membersArray).setSelected(selection);
//enable family members menu only if there is at least one family selected
members.setEnabled(false);
Component[] familiesArray = families.getMenuComponents();
for( int i=0; i<familiesArray.length; i++ ){
if( ((JCheckBoxMenuItem)familiesArray[i]).isSelected() ){
members.setEnabled(true);
break;
public static void main(String args[]) {
new Menu_Demo().setVisible(true);
private JMenuBar menubar;
private JMenu families, members, family1, family2;
private JCheckBoxMenuItem family1Select, family2Select, member11, member12, member21, member22;