Problem in validating menu item

Question

hi,
everybody.
i have created a main window using JInternalFrame. The window has a menu bar in which document menu is used for closing the main window, while employee menu is used for adding new frame for the employee. while the login frame is displayed when the application is executed.
my problem is that i want to validate that before login employee menu should be disabled, and after login is performed employee menu is enabled.
the following is my code. please reply me as i am stucked with it.
thanks in advance.
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.io.*;
import java.util.*;
public class InternalFrameDemo extends JFrame implements ActionListener
     JDesktopPane desktop;
     public InternalFrameDemo()
          super("InternalFrameDemo");
          int inset = 50;
          Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
          setBounds(inset, inset, screenSize.width - inset*2, screenSize.height - inset*2);
          desktop = new JDesktopPane();
          setContentPane(desktop);
          desktop.setBackground(Color.white);
          setJMenuBar(createMenuBar());
          desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
          createLogin();
     public JMenuBar createMenuBar()
          JMenuBar menuBar = new JMenuBar();
          JMenu menu = new JMenu("Document");
          menu.setMnemonic(KeyEvent.VK_D);
          menuBar.add(menu);
          JMenuItem menuItem = new JMenuItem("Quit");
          menuItem.setMnemonic(KeyEvent.VK_Q);
          menuItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_Q, ActionEvent.ALT_MASK));
          menuItem.setActionCommand("quit");
          menuItem.addActionListener(this);
          menu.add(menuItem);
          JMenu employee = new JMenu("Employee");
          employee.setMnemonic(KeyEvent.VK_E);
          employee.setActionCommand("employee");
          menuBar.add(employee);
          JMenuItem additem = new JMenuItem("Add");
          additem.setMnemonic(KeyEvent.VK_A);
          additem.setActionCommand("add");
          additem.addActionListener(this);
          employee.add(additem);
          return menuBar;
     public void actionPerformed(ActionEvent ae)
          String str = ae.getActionCommand();
          if(str.equals("add"))
               System.out.println("Employee Form Invoked");
               createEmployee();
          else if(str.equals("quit"))
               quit();
     public void createEmployee()
          MyEmployeeFrame employeeframe = new MyEmployeeFrame();
          employeeframe.setVisible(true);
          desktop.add(employeeframe);
          try
               employeeframe.setSelected(true);
          catch(Exception e)
     public void createLogin()
          MyLogin loginframe = new MyLogin();
          loginframe.setVisible(true);
          desktop.add(loginframe);
          try
               loginframe.setSelected(true);
          catch(Exception e){}
     public void quit()
          System.exit(0);
     private static void createAndShowGUI()
          JFrame.setDefaultLookAndFeelDecorated(true);
          InternalFrameDemo frame = new InternalFrameDemo();
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setSize(800,600);
          frame.setVisible(true);
     public static void main(String a[])
          createAndShowGUI();
class MyEmployeeFrame extends JInternalFrame implements ActionListener
     JFrame employeeframe;
     JLabel labelfirstname;
     JLabel labellastname;
     JLabel labelage;
     JLabel labeladdress;
     JLabel labelcity;
     JLabel labelstate;
     JTextField textfirstname;
     JTextField textlastname;
     JTextField textage;
     JTextField textaddress;
     JTextField textcity;
     JTextField textstate;
     JButton buttonsave;
     FileOutputStream out;
     PrintStream p;
     String strfirstname,strlastname,strage,straddress,strcity,strstate;
     GridBagLayout gl;
     GridBagConstraints gbc;
     public MyEmployeeFrame()
          super("Employee Details",true,true,true,true);
          setSize(500,400);
          labelfirstname = new JLabel("First Name");
          labellastname = new JLabel("Last Name");
          labelage = new JLabel("Age");
          labeladdress = new JLabel("Address");
          labelcity = new JLabel("City");
          labelstate = new JLabel("State");
          textfirstname = new JTextField(10);
          textlastname = new JTextField(10);
          textage = new JTextField(5);
          textaddress = new JTextField(15);
          textcity = new JTextField(10);
          textstate = new JTextField(10);
          buttonsave = new JButton("Save");
          gl = new GridBagLayout();
          gbc = new GridBagConstraints();
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 3;
          gl.setConstraints(labelfirstname,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 3;
          gl.setConstraints(textfirstname,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 5;
          gl.setConstraints(labellastname,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 5;
          gl.setConstraints(textlastname,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 7;
          gl.setConstraints(labelage,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 7;
          gl.setConstraints(textage,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 9;
          gl.setConstraints(labeladdress,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 9;
          gl.setConstraints(textaddress,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 11;
          gl.setConstraints(labelcity,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 11;
          gl.setConstraints(textcity,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 13;
          gl.setConstraints(labelstate,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 13;
          gl.setConstraints(textstate,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 17;
          gl.setConstraints(buttonsave,gbc);
          Container contentpane = getContentPane();
          contentpane.setLayout(gl);
          contentpane.add(labelfirstname);
          contentpane.add(textfirstname);
          contentpane.add(labellastname);
          contentpane.add(textlastname);
          contentpane.add(labelage);
          contentpane.add(textage);
          contentpane.add(labeladdress);
          contentpane.add(textaddress);
          contentpane.add(labelcity);
          contentpane.add(textcity);
          contentpane.add(labelstate);
          contentpane.add(textstate);
          contentpane.add(buttonsave);
          buttonsave.addActionListener(this);
     public void reset()
          textfirstname.setText("");
          textlastname.setText("");
          textage.setText("");
          textaddress.setText("");
          textcity.setText("");
          textstate.setText("");
     public void actionPerformed(ActionEvent ae)
          String str = ae.getActionCommand();
          System.out.println(str);
          if(str.equalsIgnoreCase("Save"))
             try
                     out = new FileOutputStream("myfile.txt",true);
                     p = new PrintStream( out );
                     strfirstname = textfirstname.getText();
                     strlastname = textlastname.getText();
                     strage = textage.getText();
                     straddress = textaddress.getText();
                     strcity = textcity.getText();
                     strstate = textstate.getText();
                     p.print(strfirstname+"|");
                     p.print(strlastname+"|");
                     p.print(strage+"|");
                     p.print(straddress+"|");
                     p.print(strcity+"|");
                     p.println(strstate);
                     System.out.println("Record Saved");
                     reset();
                     p.close();
             catch (Exception e)
                     System.err.println ("Error writing to file");
class MyLogin extends JInternalFrame implements ActionListener
     JFrame loginframe;
     JLabel labelname;
     JLabel labelpassword;
     JTextField textname;
     JPasswordField textpassword;
     JButton okbutton;
     String name = "";
     FileOutputStream out;
     PrintStream p;
     Date date;
     GregorianCalendar gcal;
     GridBagLayout gl;
     GridBagConstraints gbc;
     public MyLogin()
          super("Login",true,true,true,true);
          setSize(400,300);
          gl = new GridBagLayout();
          gbc = new GridBagConstraints();
          labelname = new JLabel("User");
          labelpassword = new JLabel("Password");
          textname = new JTextField("",9);
          textpassword = new JPasswordField(5);
          okbutton = new JButton("OK");
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 5;
          gl.setConstraints(labelname,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 2;
          gbc.gridy = 5;
          gl.setConstraints(textname,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 10;
          gl.setConstraints(labelpassword,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 2;
          gbc.gridy = 10;
          gl.setConstraints(textpassword,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 15;
          gl.setConstraints(okbutton,gbc);
          Container contentpane = getContentPane();
          contentpane.setLayout(gl);
          contentpane.add(labelname);
          contentpane.add(labelpassword);
          contentpane.add(textname);
          contentpane.add(textpassword);
          contentpane.add(okbutton);
          okbutton.addActionListener(this);
     public void reset()
          textname.setText("");
          textpassword.setText("");
     public void run()
          try
               String text = textname.getText();
               String blank="";
               if(text.equals(blank))
                  System.out.println("First Enter a UserName");
               else
                    if(text != blank)
                         date = new Date();
                         gcal = new GregorianCalendar();
                         gcal.setTime(date);
                         out = new FileOutputStream("log.txt",true);
                         p = new PrintStream( out );
                         name = textname.getText();
                         String entry = "UserName:- " + name + " Logged in:- " + gcal.get(Calendar.HOUR) + ":" + gcal.get(Calendar.MINUTE) + " Date:- " + gcal.get(Calendar.DATE) + "/" + gcal.get(Calendar.MONTH) + "/" + gcal.get(Calendar.YEAR);
                         p.println(entry);
                         System.out.println("Record Saved");
                         reset();
                         p.close();
          catch (IOException e)
               System.err.println("Error writing to file");
     public void actionPerformed(ActionEvent ae)
          String str = ae.getActionCommand();
          if(str.equals("OK"))
               run();
               loginframe.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}

Answer 1

hai!.
i am happy to help you.Below is the modified code of ur program.if u still have problem please post.
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
public class MainFrame extends JFrame implements ActionListener
     JDesktopPane desktop;
     JMenuBar menubar;
     JMenu menu,menuemployee;
     public JMenuItem menuitemlogin;
     JMenuItem menuitemquit,itememployee;
     public MainFrame()
          super("MainFrame");
          int inset = 50;
          Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
          setBounds(inset,inset,screenSize.width - inset*2,screenSize.height - inset*2);
          desktop = new JDesktopPane();
          desktop.setBackground(Color.white);
          setContentPane(desktop);
          desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
          setJMenuBar(createMenuBar());
          //createLogin();
     public JMenuBar createMenuBar()
          menubar = new JMenuBar();
          menu = new JMenu("Document");
          menu.setMnemonic(KeyEvent.VK_D);
          menuitemlogin = new JMenuItem("Login");
          menuitemlogin.setMnemonic(KeyEvent.VK_L);
          menuitemlogin.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_L, ActionEvent.ALT_MASK));
          menuitemlogin.setActionCommand("login");
          menuitemlogin.addActionListener(this);
          menuitemquit = new JMenuItem("Quit");
          menuitemquit.setMnemonic(KeyEvent.VK_Q);
          menuitemquit.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_Q, ActionEvent.ALT_MASK));
          menuitemquit.setActionCommand("quit");
          menuitemquit.addActionListener(this);
          menubar.add(menu);
          menu.add(menuitemlogin);
          menu.add(menuitemquit);
          itememployee = new JMenu("Employee");
          itememployee.setMnemonic(KeyEvent.VK_E);
          itememployee.setActionCommand("employee");
//added this line to disable the itememployee item button     
          itememployee.setEnabled(false);
//use above the displaying menus all are "JAbstractButton" itememployee.disable();
          menubar.add(itememployee);
          JMenuItem additem = new JMenuItem("Add");
          additem.setMnemonic(KeyEvent.VK_A);
          additem.setActionCommand("add");
          additem.addActionListener(this);
          itememployee.add(additem);
          return menubar;
     public void actionPerformed(ActionEvent ae)
          String str = ae.getActionCommand();
          if(str.equals("login"))
//added this line to disable login menu:
menuitemlogin.setEnabled(false);
               createLogin();
          else if(str.equals("quit"))
               System.exit(0);
          else if(str.equals("add"))
               System.out.println("Employee Form Invoked");
               createEmployee();
     private static void createAndShowGUI()
          JFrame.setDefaultLookAndFeelDecorated(true);
          MainFrame frame = new MainFrame();
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setSize(800,600);
          frame.setVisible(true);
     public static void main(String a[])
          createAndShowGUI();
     public void createLogin()
          Login loginobj = new Login();
          loginobj.setVisible(true);
          //itememployee.enable();
          desktop.add(loginobj);
     public void createEmployee()
          Employee employeeobj = new Employee();
          employeeobj.setVisible(true);
          desktop.add(employeeobj);
class Employee extends JInternalFrame implements ActionListener
     JFrame employeeframe;
     JLabel labelfirstname;
     JLabel labellastname;
     JLabel labelage;
     JLabel labeladdress;
     JLabel labelcity;
     JLabel labelstate;
     JTextField textfirstname;
     JTextField textlastname;
     JTextField textage;
     JTextField textaddress;
     JTextField textcity;
     JTextField textstate;
     JButton buttonsave;
     FileOutputStream out;
     PrintStream p;
     String strfirstname,strlastname,strage,straddress,strcity,strstate;
     GridBagLayout gl;
     GridBagConstraints gbc;
     public Employee()
          super("Employee Details",true,true,true,true);
          setSize(400,300);
          labelfirstname = new JLabel("First Name");
          labellastname = new JLabel("Last Name");
          labelage = new JLabel("Age");
          labeladdress = new JLabel("Address");
          labelcity = new JLabel("City");
          labelstate = new JLabel("State");
          textfirstname = new JTextField(10);
          textlastname = new JTextField(10);
          textage = new JTextField(5);
          textaddress = new JTextField(15);
          textcity = new JTextField(10);
          textstate = new JTextField(10);
          buttonsave = new JButton("Save");
          gl = new GridBagLayout();
          gbc = new GridBagConstraints();
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 3;
          gl.setConstraints(labelfirstname,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 3;
          gl.setConstraints(textfirstname,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 5;
          gl.setConstraints(labellastname,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 5;
          gl.setConstraints(textlastname,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 7;
          gl.setConstraints(labelage,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 7;
          gl.setConstraints(textage,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 9;
          gl.setConstraints(labeladdress,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 9;
          gl.setConstraints(textaddress,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 11;
          gl.setConstraints(labelcity,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 11;
          gl.setConstraints(textcity,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 13;
          gl.setConstraints(labelstate,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 13;
          gl.setConstraints(textstate,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 3;
          gbc.gridy = 17;
          gl.setConstraints(buttonsave,gbc);
          Container contentpane = getContentPane();
          contentpane.setLayout(gl);
          contentpane.add(labelfirstname);
          contentpane.add(textfirstname);
          contentpane.add(labellastname);
          contentpane.add(textlastname);
          contentpane.add(labelage);
          contentpane.add(textage);
          contentpane.add(labeladdress);
          contentpane.add(textaddress);
          contentpane.add(labelcity);
          contentpane.add(textcity);
          contentpane.add(labelstate);
          contentpane.add(textstate);
          contentpane.add(buttonsave);
          buttonsave.addActionListener(this);
     public void reset()
          textfirstname.setText("");
          textlastname.setText("");
          textage.setText("");
          textaddress.setText("");
          textcity.setText("");
          textstate.setText("");
     public void actionPerformed(ActionEvent ae)
          String str = ae.getActionCommand();
          System.out.println(str);
          if(str.equalsIgnoreCase("Save"))
     try
     out = new FileOutputStream("myfile.txt",true);
     p = new PrintStream( out );
     strfirstname = textfirstname.getText();
     strlastname = textlastname.getText();
     strage = textage.getText();
     straddress = textaddress.getText();
     strcity = textcity.getText();
     strstate = textstate.getText();
     p.print(strfirstname+"|");
     p.print(strlastname+"|");
     p.print(strage+"|");
     p.print(straddress+"|");
     p.print(strcity+"|");
     p.println(strstate);
     System.out.println("Record Saved");
     reset();
     p.close();
     catch (Exception e)
     System.err.println ("Error writing to file");
class Login extends JInternalFrame implements ActionListener,InternalFrameListener
     JFrame loginframe;
     JLabel labelname;
     JLabel labelpassword;
     JTextField textname;
     JPasswordField textpassword;
     JButton okbutton;
     String name = "";
     FileOutputStream out;
     PrintStream p;
     Date date;
     GregorianCalendar gcal;
     GridBagLayout gl;
     GridBagConstraints gbc;
     MainFrame obj = new MainFrame();
     public Login()
          super("Login",true,true,true,true);
          setSize(300,300);
          gl = new GridBagLayout();
          gbc = new GridBagConstraints();
          labelname = new JLabel("User");
          labelpassword = new JLabel("Password");
          textname = new JTextField("",9);
          textpassword = new JPasswordField(5);
          okbutton = new JButton("OK");
          okbutton.setMnemonic(KeyEvent.VK_O);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 5;
          gl.setConstraints(labelname,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 2;
          gbc.gridy = 5;
          gl.setConstraints(textname,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 10;
          gl.setConstraints(labelpassword,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 2;
          gbc.gridy = 10;
          gl.setConstraints(textpassword,gbc);
          gbc.anchor = GridBagConstraints.NORTHWEST;
          gbc.gridx = 1;
          gbc.gridy = 15;
          gl.setConstraints(okbutton,gbc);
          Container contentpane = getContentPane();
          contentpane.setLayout(gl);
          contentpane.add(labelname);
          contentpane.add(labelpassword);
          contentpane.add(textname);
          contentpane.add(textpassword);
          contentpane.add(okbutton);
          okbutton.addActionListener(this);
          this.addInternalFrameListener(this);
     public void reset()
          textname.setText("");
          textpassword.setText("");
     public void run()
          try
               String text = textname.getText();
               String blank="";
               if(text.equals(blank))
          System.out.println("First Enter a UserName");
          JOptionPane.showMessageDialog(loginframe,"Enter UserName","Alert",JOptionPane.WARNING_MESSAGE);
               else
                    if(text != blank)
                         date = new Date();
                         gcal = new GregorianCalendar();
                         gcal.setTime(date);
                         out = new FileOutputStream("log.txt",true);
                         p = new PrintStream( out );
                         name = textname.getText();
                         String entry = "UserName:- " + name + " Logged in:- " + gcal.get(Calendar.HOUR) + ":" + gcal.get(Calendar.MINUTE) + " Date:- " + gcal.get(Calendar.DATE) + "/" + gcal.get(Calendar.MONTH) + "/" + gcal.get(Calendar.YEAR);
                         p.println(entry);
                         System.out.println("Record Saved");
                         reset();
                         p.close();
                         System.out.println("Enabling itememployee");
                         obj.itememployee.enable();
//hai boy add this line to enable itememployee menu:
itememployee.setEnabled(true);
// i added this line to close/dispose the internal login frame after ok button is pressed
this.dispose();
          catch (IOException e)
               System.err.println("Error writing to file");
     public void actionPerformed(ActionEvent ae)
          String str = ae.getActionCommand();
          if(str.equalsIgnoreCase("OK"))
               try
                    run();
                    loginframe.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
               catch(Exception e)
public void internalFrameClosing(InternalFrameEvent e){
//added this line to again enable login menu if the user closed the login window
               menuitemlogin.setEnabled(true);
public void internalFrameOpened(InternalFrameEvent e) {  }
public void internalFrameIconified(InternalFrameEvent e) {    }
public void internalFrameDeiconified(InternalFrameEvent e) {   }
public void internalFrameActivated(InternalFrameEvent e) {    }
public void internalFrameDeactivated(InternalFrameEvent e) {    }
public void internalFrameClosed(InternalFrameEvent e) {   }
}