Can someone pls help me with this code

Question

The method createScreen() creates the first screen wherein the user makes a selection if he wants all the data ,in a range or single data.The problem comes in when the user makes a selection of single.that then displays the singleScreen() method.Then the user has to input a key data like date or invoice no on the basis of which all the information for that set of data is selected.Now if the user inputs a wrong key that does not exist for the first time the program says invalid entry of data,after u click ok on the option pane it prompts him to enter the data again.But since then whenever the user inputs wrong data the program says wrong data but after displaying the singlescreen again does not wait for input from the user it again flashes the option pane with the invalid entry message.and this goes on doubling everytime the user inputs wrong data.the second wrong entry of data flashes the error message twice,the third wrong entry flashes the option pane message 4 times and so on.What actually happens is it does not wait at the singlescreen() for user to input data ,it straight goes into displaying the JOptionPane message for wrong data entry so we have to click the optiion pane twice,four times and so on.
Can someone pls help me with this!!!!!!!!!
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.util.*;
public class MainMenu extends JFrame implements ActionListener,ItemListener{
//class     
     FileReaderDemo1 fd=new FileReaderDemo1();
     FileReaderDemo1 fr;
     Swing1Win sw;
//primary
     int monthkey=1,counter=0;
     boolean flag=false,splitflag=false;
     String selection,monthselection,dateselection="01",yearselection="00",s,searchcriteria="By Date",datekey,smonthkey,invoiceno;
//arrays
     String singlesearcharray[];
     String[] monthlist={"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sept","Oct","Nov","Dec"};
     String[] datelist=new String[31];
     String[] yearlist=new String[100];
     String[] searchlist={"By Date","By Invoiceno"};
//collection
     Hashtable allinvoicesdata=new Hashtable();
     Vector data=new Vector();
     Enumeration keydata;
//components
     JButton next=new JButton("NEXT>>");
     JComboBox month,date,year,search;
     JLabel bydate,byinvno,trial;
     JTextField yeartext,invtext;
     JPanel panel1,panel2,panel3,panel4;
     JRadioButton single,range,all;
     ButtonGroup group;
     JButton select=new JButton("SELECT");
//frame and layout declarations
     JFrame jf;
     Container con;
     GridBagLayout gridbag=new GridBagLayout();
     GridBagConstraints gc=new GridBagConstraints();
//constructor
     MainMenu(){
          jf=new JFrame();
          con=getContentPane();
          con.setLayout(null);
          fr=new FileReaderDemo1();
          createScreen();
          setSize(500,250);
          setLocation(250,250);
          setVisible(true);
//This is thefirst screen displayed
     public void createScreen(){
          group=new ButtonGroup();
          single=new JRadioButton("SINGLE");
          range=new JRadioButton("RANGE");
          all=new JRadioButton("ALL");
          search=new JComboBox(searchlist);
          group.add(single);
          group.add(range);
          group.add(all);
          single.setBounds(100,50,100,20);
          search.setBounds(200,50,100,20);
          range.setBounds(100,90,100,20);
          all.setBounds(100,130,100,20);
          select.setBounds(200,200,100,20);
          con.add(single);
          con.add(search);
          con.add(range);
          con.add(all);
          con.add(select);
          search.setEnabled(false);
          single.addItemListener(this);
          search.addActionListener(new MyActionListener());     
          range.addItemListener(this);
          all.addItemListener(this);
          select.addActionListener(this);
     public class MyActionListener implements ActionListener{
          public void actionPerformed(ActionEvent a){
               JComboBox cb=(JComboBox)a.getSource();
               if(a.getSource().equals(month))
                    monthkey=((cb.getSelectedIndex())+1);
               if(a.getSource().equals(date)){
                    dateselection=(String)cb.getSelectedItem();
               if(a.getSource().equals(year))
                    yearselection=(String)cb.getSelectedItem();
               if(a.getSource().equals(search)){
                    searchcriteria=(String)cb.getSelectedItem();
     public void itemStateChanged(ItemEvent ie){
          if(ie.getItem()==single){
               selection="single";     
               search.setEnabled(true);
          else if (ie.getItem()==all){
               selection="all";
               search.setEnabled(false);
          else if (ie.getItem()==range){
               search.setEnabled(false);
     public void actionPerformed(ActionEvent ae){          
          if(ae.getSource().equals(select))
                    if(selection.equals("single")){
                         singleScreen();
                    if(selection.equals("all"))
                         sw=new Swing1Win();
          if(ae.getSource().equals(next)){
               if(monthkey<9)
                    smonthkey="0"+monthkey;
               System.out.println(smonthkey+"/"+dateselection+"/"+yearselection+"it prints this");
               allinvoicesdata=fr.read(searchcriteria);
               if (searchcriteria.equals("By Date")){
                    System.out.println("it goes in this");
                    singleinvoice(smonthkey+"/"+dateselection+"/"+yearselection);
               else if (searchcriteria.equals("By Invoiceno")){
                    invoiceno=invtext.getText();
                    singleinvoice(invoiceno);
               if (flag == false){
                    System.out.println("flag is false");
                    singleScreen();
               else{
               System.out.println("its in here");
               singlesearcharray=new String[data.size()];
               data.copyInto(singlesearcharray);
               sw=new Swing1Win(singlesearcharray);
     public void singleinvoice(String searchdata){
          keydata=allinvoicesdata.keys();
          while(keydata.hasMoreElements()){
                    s=(String)keydata.nextElement();
                    if(s.equals(searchdata)){
                         System.out.println(s);
                         flag=true;
                         break;
          if (flag==true){
               System.out.println("vector found");
               System.exit(0);
               data= ((Vector)(allinvoicesdata.get(s)));
          else{
               JOptionPane.showMessageDialog(jf,"Invalid entry of date : choose again");     
     public void singleScreen(){
          System.out.println("its at the start");
          con.removeAll();
          SwingUtilities.updateComponentTreeUI(con);
          con.setLayout(null);
          counter=0;
          panel2=new JPanel(gridbag);
          bydate=new JLabel("By Date : ");
          byinvno=new JLabel("By Invoice No : ");
          dateComboBox();
          invtext=new JTextField(6);
          gc.gridx=0;
          gc.gridy=0;
          gc.gridwidth=1;
          gridbag.setConstraints(month,gc);
          panel2.add(month);
          gc.gridx=1;
          gc.gridy=0;
          gridbag.setConstraints(date,gc);
          panel2.add(date);
          gc.gridx=2;
          gc.gridy=0;
          gc.gridwidth=1;
          gridbag.setConstraints(year,gc);
          panel2.add(year);
          bydate.setBounds(100,30,60,20);
          con.add(bydate);
          panel2.setBounds(170,30,200,30);
          con.add(panel2);
          byinvno.setBounds(100,70,100,20);
          invtext.setBounds(200,70,50,20);
          con.add(byinvno);
          con.add(invtext);
          next.setBounds(300,200,100,20);
          con.add(next);
          if (searchcriteria.equals("By Invoiceno")){
               month.setEnabled(false);
               date.setEnabled(false);
               year.setEnabled(false);
          else if(searchcriteria.equals("By Date")){
               byinvno.setEnabled(false);
               invtext.setEnabled(false);
          monthkey=1;
          dateselection="01";
          yearselection="00";
          month.addActionListener(new MyActionListener());
          date.addActionListener(new MyActionListener());
          year.addActionListener(new MyActionListener());
          next.addActionListener(this);
          invtext.addKeyListener(new KeyAdapter(){
               public void keyTyped(KeyEvent ke){
                    char c=ke.getKeyChar();
                    if ((c == KeyEvent.VK_BACK_SPACE) ||(c == KeyEvent.VK_DELETE)){
                         System.out.println(counter+"before");
                         counter--;               
                         System.out.println(counter+"after");
                    else
                         counter++;
                    if(counter>6){
                         System.out.println(counter);
                         counter--;
                         ke.consume();
                    else                    
                    if(!((Character.isDigit(c) || (c == KeyEvent.VK_BACK_SPACE) || (c == KeyEvent.VK_DELETE)))){
                         getToolkit().beep();
                         counter--;     
                         JOptionPane.showMessageDialog(null,"please enter numerical value");
                         ke.consume();
          System.out.println("its at the end");
     public void dateComboBox(){          
          for (int counter=0,day=01;day<=31;counter++,day++)
               if(day<=9)
                    datelist[counter]="0"+String.valueOf(day);
               else
                    datelist[counter]=String.valueOf(day);
          for(int counter=0,yr=00;yr<=99;yr++,counter++)
               if(yr<=9)
                    yearlist[counter]="0"+String.valueOf(yr);
               else
                    yearlist[counter]=String.valueOf(yr);
          month=new JComboBox(monthlist);
          date=new JComboBox(datelist);
          year=new JComboBox(yearlist);
     public static void main(String[] args){
          MainMenu mm=new MainMenu();
     public class WindowHandler extends WindowAdapter{
          public void windowClosing(WindowEvent we){
               jf.dispose();
               System.exit(0);
}     

Answer 1

Hi,
I had a similar problem with a message dialog. Don't know if it is a bug, I was in a hurry and had no time to search the bug database... I found a solution by using keyPressed() and keyReleased() instead of keyTyped():
   private boolean pressed = false;
   public void keyPressed(KeyEvent e) {
      pressed = true;
   public void keyReleased(KeyEvent e) {
      if (!pressed) {
         e.consume();
         return;
      // Here you can test whatever key you want
   //...I don't know if it will help you, but it worked for me.
Regards.