ActionListener in other package change menuItem

Question

hiya,
I have a class MenuBuild and within i specify ActionListeners to the items.
now when i receive an action it goes to the set Listener, now from the Listener i want to be able to change an item in the menu.
the two files are both in a diffrent package but i dont think that should be a problem at all.
when i try to get an int from the menu ( menu.getItem() )
it returns a NullPointerException.
while i already create this menu.
is there anyway i can retreive this info?
thnx in advance
public class MenuBuild {
     public JMenuBar bar = new JMenuBar();
     public JMenuItem item;
     public JMenu menu;
     HelpMe help;
     AboutMe about;
     FormBuild frame;     
     public JMenuBar menuBouw(String menu1[], String menu2[], String[] menu3) {
          menu = new JMenu(menu1[0]);
          for (int i = 1; i < menu1.length; i++) {
               if (menu1[i] == "Seperator") {
                    menu.addSeparator();
               else {
                    item = new JMenuItem(menu1);
                    item.addActionListener(new BestandMenuListener());
                    menu.add(item);
          bar.add(menu);
          menu = new JMenu(menu2[0]);          
          for (int i = 1; i < menu2.length; i++) {
               if (menu2[i] == "Seperator") {
                    menu.addSeparator();
               else {
                    item = new JMenuItem(menu2[i]);
                    item.addActionListener(new ExtraMenuListener());
                    menu.add(item);
          bar.add(menu);     
          return bar;
public class ExtraMenuListener implements ActionListener {
     MenuBuild menuCall;
     HelpMe help;
     AboutMe about;
     public void actionPerformed (ActionEvent e) {
          menuCall = new MenuBuild();
          if (e.getActionCommand() == "Wetenschappelijk") {
          System.out.println(menuCall.menu.getItemCount());     
          if (e.getActionCommand() == "Simpel") {
          if (e.getActionCommand() == "Help") {
               help = new HelpMe();
               help.help();
          if (e.getActionCommand() == "About...") {
               about = new AboutMe();
               about.about();

Answer 1

import nl.rekenmachine.gui.forms.FormBuild;
import nl.rekenmachine.gui.forms.MenuBuild;
class RekenMachine_v3 {
     FormBuild frame;
     MenuBuild menu;
     String[] menu1;
     String[] menu2;
     public static void main (String args[]) {
          new RekenMachine_v3();
     public RekenMachine_v3() {
          String menu1[]={"Bestand", "Nieuw", "Openen", "Opslaan", "Afsluiten"};
          String menu2[]={"Extra", "Wetenschappelijk", "Help", "Seperator", "About..."};
frame = new FormBuild();
frame.BuildFrame("RekenMachine", 300, 300, 50, 50, menu1, menu2);               
package nl.rekenmachine.gui.forms;
import javax.swing.JFrame;
public class FormBuild extends JFrame {
     private static final long serialVersionUID = -2092267704264962405L;
     JFrame frame;
     JFrame frame2;
     JFrame frame3;
     MenuBuild menu;
     public JFrame BuildFrame(String titel, int breedte , int hoogte, int x, int y, String[] menu1, String[] menu2) {
          menu = new MenuBuild();
          frame = new JFrame();
          frame.setJMenuBar(menu.menuBouw(menu1, menu2));          
          frame.setTitle(titel);
          frame.setSize(breedte, hoogte);
          frame.setLocation(x, y);
          frame.setName(titel);
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setVisible(true);          
          return frame;
     public JFrame BuildFrameNoMenu(String titel, int breedte, int hoogte, int x, int y, String image ) {
          frame2 = new JFrame();
          frame2.setTitle(titel);
          frame2.setSize(breedte, hoogte);
          frame2.setLocation(x, y);
          frame2.setName(titel);
          frame2.setVisible(true);          
          return frame2;
package nl.rekenmachine.gui.forms;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import nl.rekenmachine.gui.listeners.BestandMenuListener;
import nl.rekenmachine.gui.listeners.ExtraMenuListener;
public class MenuBuild {
     public JMenuBar bar = new JMenuBar();
     public JMenuItem item;
     public JMenu menu;
     public JMenuBar menuBouw(String menu1[], String menu2[]) {
          menu = new JMenu(menu1[0]);
          for (int i = 1; i < menu1.length; i++) {
               if (menu1.equals("Seperator")) {
                    menu.addSeparator();
               else {
                    item = new JMenuItem(menu1[i]);
                    item.addActionListener(new BestandMenuListener());
                    menu.add(item);
          bar.add(menu);
          menu = new JMenu(menu2[0]);          
          for (int i = 1; i < menu2.length; i++) {
               if (menu2[i].equals("Seperator")) {
                    menu.addSeparator();
               else {
                    item = new JMenuItem(menu2[i]);
                    item.addActionListener(new ExtraMenuListener());
                    menu.add(item);
          bar.add(menu);     
          return bar;
package nl.rekenmachine.gui.listeners;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import nl.rekenmachine.gui.forms.MenuBuild;
public class ExtraMenuListener implements ActionListener {
     MenuBuild menuCall;
     public void actionPerformed (ActionEvent e) {
          menuCall = new MenuBuild();
          if (e.getActionCommand().equals("Wetenschappelijk")) {
               System.out.println(menuCall.menu.getItemCount());               
          if (e.getActionCommand().equals("Simpel")) {
          if (e.getActionCommand().equals("Help")) {
          if (e.getActionCommand().equals("About...")) {