retrieving and storing password from and to hashtable

[tom brownlee]

hello there,
my problem is one of frustration and impatience.
I have a swing GUI interface (code written below)that asks for a code and a password. I need to check the validity of both to enable the program to proceed.
how do i acccomplish this?
The code and password has to be stored somewhere in the program. (hashtable or vector or file etc).
As you may see when running the code, i also have to store and be able to retrieve information when put in by a user, but i thought id start out slowly. I am a reasonably competent java user, so please throw anything at me
My apologise if this isnt a beginner question, it seemed a good place to start.

import java.util.*;
import javax.swing.text.*;
import javax.swing.*;
import javax.swing.border.*;     
import java.awt.*;
import java.awt.event.*;
    
public class EmployeeDetails extends JFrame implements ActionListener
{
 JTextField txt1;           JTextField txt2;           JTextField txt3;           
 JTextField txt4;           JTextField txt5;           JPasswordField passwordField;
 JTextArea area;            JLabel message;            JButton modifyBtn;         
 JButton clearBtn;          JButton deleteBtn;         JButton addBtn;            JButton retrieveBtn;       
 JButton exitBtn;           JComboBox combo3;          JLabel lbl12;              
 String a = "ChChPCmrc";    String b = "ChChPScnc";    String d = "ChChPEngr";    
 String e = "ChChPNurs";    String f = "ChChPHosp";
  
    public EmployeeDetails( JFrame frame ) 
    {   
     super ( "Brownlee Computer Systems");
     setBounds( 100, 50, 650, 500);
                  
       GridBagConstraints c                         = new GridBagConstraints();
       EmptyBorder border                           = new EmptyBorder( new Insets( 0, 0, 0, 2 ) );
       EmptyBorder border1                          = new EmptyBorder( new Insets( 0, 4, 0, 2 ) );
       c.insets                                     = new Insets( 1, 1, 1, 1 );
       c.anchor                                     = GridBagConstraints.WEST;
       IntegerDocument1 FirstFourDigitDocument      = new IntegerDocument1();
       IntegerDocument2 SixDigitDocument            = new IntegerDocument2();       
       IntegerDocument3 SecondFourDigitDocument     = new IntegerDocument3();
       IntegerDocument4 EightDigitDocument          = new IntegerDocument4();
       IntegerDocument5 TwentyDigitDocument         = new IntegerDocument5();
       IntegerDocument6 SecondTwentyDigitDocument   = new IntegerDocument6();

//     Creates a panel to hold all components
        getContentPane().setLayout(new BorderLayout());
        ((JPanel)getContentPane()).setOpaque(false);
        Dimension dim = getToolkit().getScreenSize();
        getContentPane().setLocation(dim.width/2 - getContentPane().getWidth()/2, dim.height/2 - getContentPane().getHeight()/2);
                
          JPanel panel1 = new JPanel();
          panel1.setLayout(new FlowLayout(FlowLayout.CENTER));
          panel1.setOpaque(false);
          JLabel lbl1 = new JLabel("Employee Maintenance Screen");
          lbl1.setFont(new Font("Arial", Font.BOLD, 36));
          panel1.add(lbl1);
          getContentPane().add(panel1, BorderLayout.NORTH);
                
          JPanel panelEast = new JPanel();
          panelEast.setOpaque(false);
          panelEast.setLayout(new FlowLayout());
          panelEast.setBorder( BorderFactory.createEmptyBorder(0,10,0,10));
          getContentPane().add(panelEast, BorderLayout.EAST);
                
          JPanel panelWest = new JPanel();
          panelWest.setOpaque(false);
          panelWest.setLayout(new FlowLayout());
          panelWest.setBorder( BorderFactory.createEmptyBorder(0,10,0,10));
          getContentPane().add(panelWest, BorderLayout.WEST);
       
          JPanel panel2 = new JPanel();
          panel2.setOpaque(false);
          panel2.setLayout(new BorderLayout());                
          getContentPane().add(panel2, BorderLayout.CENTER);       
       
          JPanel panel2a = new JPanel();
          panel2a.setLayout(new GridBagLayout());
          Border compound = BorderFactory.createCompoundBorder(new BevelBorder( BevelBorder.LOWERED),new EmptyBorder( 5,5,5,5));
          Border compound1 = BorderFactory.createTitledBorder(compound, "Employee Security", 0, 0, null, Color.red);
          panel2a.setBorder(compound1);
          panel2.add(panel2a, BorderLayout.NORTH);
                
          JLabel lbl2 = new JLabel( "Maintenance Operation Code");
          lbl2.setFont(new Font("Helvetica", Font.BOLD, 14 ));
          lbl2.setForeground (Color.blue);
          lbl2.setBorder ( border );
          c.gridx = 0;
          c.gridy = 0;
          c.anchor = GridBagConstraints.WEST;                
          panel2a.add( lbl2, c );
          txt1 = new JTextField(4); 
          c.gridx = 1;
          c.gridy = 0;
          c.anchor = GridBagConstraints.WEST;
          txt1.setEnabled ( true );
          panel2a.add( txt1, c );
                
          JLabel lbl3 = new JLabel( "Password" );
          lbl3.setFont(new Font("Helvetica", Font.BOLD, 14 ));                
          lbl3.setForeground(Color.blue);
          lbl3.setBorder ( border );                
          c.gridx = 0;
          c.gridy = 1;
          c.anchor = GridBagConstraints.WEST;                 
          panel2a.add( lbl3, c );
          passwordField = new JPasswordField(6);
          c.gridx = 1;
          c.gridy = 1;
          c.anchor = GridBagConstraints.WEST;
          passwordField.setEnabled ( true );
          panel2a.add( passwordField, c );
                 
          JLabel lbl4 = new JLabel( "Employee Code" );
          lbl4.setFont(new Font("Helvetica", Font.BOLD, 14 ));                
          lbl4.setForeground(Color.blue);
          lbl4.setBorder ( border );               
          c.gridx = 0;
          c.gridy = 2;
          c.gridwidth = 1;
          c.gridheight = 1;
          c.anchor = GridBagConstraints.WEST;                
          panel2a.add( lbl4, c );
          txt2 = new JTextField(4);           
          c.gridx = 1;
          c.gridy = 2;
          c.anchor = GridBagConstraints.WEST;  
          txt2.setEnabled( false );
          panel2a.add( txt2, c );
                
          JPanel panel2b = new JPanel();
          panel2b.setLayout(new GridBagLayout());
          Border compound4 = BorderFactory.createCompoundBorder(new BevelBorder( BevelBorder.LOWERED),new EmptyBorder( 5,5,5,5));
          Border compound5 = BorderFactory.createTitledBorder(compound4, "Employee Details", 0, 0, null, Color.red);                
          panel2b.setBorder(compound5);
          panel2.add(panel2b, BorderLayout.CENTER);                 
                
          JPanel panel2c = new JPanel();
          panel2c.setLayout(new FlowLayout( FlowLayout.CENTER ));
          Border compound2 = BorderFactory.createCompoundBorder(new BevelBorder( BevelBorder.LOWERED),new EmptyBorder( 5,5,5,5));
          Border compound3 = BorderFactory.createTitledBorder(compound2);//, "", 0, 0, null, Color.red);
          message = new JLabel();
          message.setFont(new Font("Arial", Font.BOLD, 15));
          message.setText ("Enter Maintenance Operative Code and Password then click \"Retrieve\" button");
          message.setEnabled ( true );
          panel2c.setBorder(compound3);
          panel2c.add(message);
          panel2.add(panel2c, BorderLayout.SOUTH);
                    
          JLabel lbl5 = new JLabel( "First Name" );
          lbl5.setForeground(Color.blue);
          lbl5.setBorder ( border );            
          c.gridx = 0;
          c.gridy = 0;
          c.gridwidth = 2;
          panel2b.add( lbl5, c );
          txt3 = new JTextField(20);            
            c.gridx = 2;
            c.gridwidth = 2;
            txt3.setEnabled( false );            
            panel2b.add( txt3, c );
            
          JLabel lbl7 = new JLabel( "Last Name" );
          lbl7.setForeground(Color.blue);
          lbl7.setBorder ( border );            
          c.gridx = 0;
          c.gridy = 1;
          c.gridwidth = 2;
          panel2b.add( lbl7, c );     
          txt4 = new JTextField(20);
            c.gridx = 2;
            c.gridwidth = 2;
            txt4.setEnabled( false );           
            panel2b.add( txt4, c );           
            
          JLabel lbl6 = new JLabel( "Department Code" );               
          lbl6.setForeground(Color.blue);
          lbl6.setBorder( border1 );
          c.gridx = 4;
          c.gridy = 0;
          c.gridwidth = 2;           
          panel2b.add( lbl6, c );    
            combo3 = new JComboBox();                
            combo3.addItem( a );
            combo3.addItem( b );
            combo3.addItem( d );
            combo3.addItem( e );
            combo3.addItem( f );
            c.gridx = 6;
            combo3.setEnabled( false );           
            panel2b.add( combo3, c );             
            MyItemListener actionListener = new MyItemListener();
            combo3.addItemListener(actionListener); 
 
            lbl12 = new JLabel();
            lbl12.setBorder ( border );
            lbl12.setFont(new Font("", Font.BOLD, 16));
            lbl12.setEnabled( true );
            lbl12.setText("Commerce");
            c.gridx = 6;
            c.gridy = 1;
            c.gridwidth = 2;
            panel2b.add( lbl12, c ); 
          JLabel lbl9 = new JLabel( "IRD Number" );
          lbl9.setForeground(Color.blue);
          lbl9.setBorder ( border );                     
          c.gridx = 0;
          c.gridy = 2;
          c.gridwidth = 2;        
          panel2b.add( lbl9, c );   
          txt5 = new JTextField(8);
            c.gridx = 2;
            c.gridwidth = 2;
            txt5.setEnabled( false );
            panel2b.add( txt5, c );            
            txt5.addKeyListener (new KeyAdapter()
            {
             public void keyTyped(KeyEvent e) 
              {
               char c = e.getKeyChar();      
               if (!((Character.isDigit(c) || (c == KeyEvent.VK_BACK_SPACE) || (c == KeyEvent.VK_DELETE)))) 
                {
                 getToolkit().beep();
                 e.consume();
                }
              }
            });
          
          JLabel lbl8 = new JLabel( "Gender" );           
          lbl8.setForeground(Color.blue);
          lbl8.setBorder ( border1 );             
          c.gridx = 5;
          c.gridy = 2;
          c.anchor = GridBagConstraints.EAST;
          c.gridwidth = 1;         
          panel2b.add( lbl8, c ); 
            JPanel radioPanel = new JPanel();
                // Create a FlowLayout JPanel with 5 pixel horizontal gaps
                // and no vertical gaps
            radioPanel.setLayout( new FlowLayout( FlowLayout.LEFT, 5, 0 ) );
            ButtonGroup group = new ButtonGroup();
            JRadioButton radio1 = new JRadioButton( "Male" );
            radio1.setSelected( true );
            radio1.setEnabled( false );            
            group.add( radio1 );
            JRadioButton radio2 = new JRadioButton( "Female" );
            radio2.setEnabled( false );            
            group.add( radio2 );
            radioPanel.add( radio1 );
            radioPanel.add( radio2 );
            c.gridx = 6;
            c.gridwidth = 2;
            c.anchor = GridBagConstraints.CENTER;
            panel2b.add( radioPanel, c);
            
          JLabel lbl10 = new JLabel( "Notes" );
          lbl10.setForeground(Color.blue);
          lbl10.setBorder ( border );
          c.gridx = 0;
          c.gridy = 3;
          c.gridwidth = 2;
          panel2b.add( lbl10, c );  
            area = new JTextArea( 5, 10 );
            JScrollPane scroll = new JScrollPane (area);
            c.gridx = 2;
            c.gridwidth = 10; // span across 10 columns
            c.gridheight = 5; // span across 5 rows           
            c.fill = GridBagConstraints.BOTH; // fills the cols & rows
            area.setEnabled( false );
            area.setLineWrap ( true );
            area.setWrapStyleWord ( true );
            panel2b.add( scroll, c );
            JPanel panel3 = new JPanel();
            panel3.setOpaque(false);
            panel3.setLayout(new FlowLayout(FlowLayout.CENTER));
            getContentPane().add(panel3, BorderLayout.SOUTH);
                
            modifyBtn = new JButton( "Modify" );
            modifyBtn.setEnabled( false );            
            panel3.add(modifyBtn);
            clearBtn = new JButton( "Clear" );                
            clearBtn.setEnabled( false );                      
            clearBtn.addActionListener(this);
            panel3.add(clearBtn);
            
            deleteBtn = new JButton( "Delete" );
            deleteBtn.setEnabled( false );            
            panel3.add(deleteBtn);
            
            addBtn = new JButton( "Add" );
            addBtn.setEnabled( false );             
            panel3.add(addBtn);
            
            retrieveBtn = new JButton( "Retrieve" );
            retrieveBtn.setEnabled( true );
            retrieveBtn.addActionListener ( this );
            panel3.add( retrieveBtn );
            
            exitBtn = new JButton( "Exit" );
            exitBtn.addActionListener ( this );
            panel3.add(exitBtn);
         
         final ImageIcon m_image = new ImageIcon("a:/EmployeeDetails/Cabg08.jpg");
         final int winc = m_image.getIconWidth();
         final int hinc = m_image.getIconHeight();
         JLabel backlabel = new JLabel("");
         if (m_image.getIconWidth() > 0 && m_image.getIconHeight() > 0)
         {
           backlabel = new JLabel() 
             {
               public void paintComponent(Graphics g) 
                 {
                   int w = getParent().getWidth();
                   int h = getParent().getHeight();
                   for (int i=0;i<h+hinc;i=i+hinc)
                     {
                       for (int j=0;j<w+winc;j=j+winc)
                        {
                          m_image.paintIcon(this,g,j,i);
                        }
                     }
                  }
                      public Dimension getPreferredSize() 
                  {
                      return new Dimension(super.getSize());
                  }
                      public Dimension getMinimumSize() 
                  {
                      return getPreferredSize();
                  }
             };
         
         getLayeredPane().add(backlabel, new Integer(Integer.MIN_VALUE));
         backlabel.setBounds(0,0,5000,5000);
         setVisible(true);
}
         setDefaultCloseOperation( WindowConstants.DO_NOTHING_ON_CLOSE );
         setVisible( true );
         txt1.setDocument           ( FirstFourDigitDocument );        
         txt2.setDocument           ( SecondFourDigitDocument );
         txt5.setDocument           ( EightDigitDocument );
         passwordField.setDocument  ( SixDigitDocument );
         txt3.setDocument           ( TwentyDigitDocument );
         txt4.setDocument           ( SecondTwentyDigitDocument );

}   

class IntegerDocument1 extends PlainDocument 
{ 
 public void insertString(int offset, String str, AttributeSet a) throws BadLocationException 
  { 
   char[] insertChars = str.toCharArray(); 
   boolean valid = true; 
   boolean fit = true; 
    if (insertChars.length + getLength() <= 4) 
     { 
      for (int i = 0; i < insertChars.length; i++) 
       { 
        if (!Character.isDigit(insertChars[i])) 
         { 
          valid = false; 
          break; 
         }
       } 
     } 
    else 
     fit = false; 
     if (fit && valid) 
        super.insertString(offset, str, a); 
     else if (!fit) 
        getToolkit().beep(); 
  } 
}  
 
class IntegerDocument2 extends PlainDocument 
{ 
 public void insertString(int offset, String str, AttributeSet a) throws BadLocationException 
  { 
   char[] insertChars = str.toCharArray(); 
   boolean valid = true; 
   boolean fit = true; 
    if (insertChars.length + getLength() <= 6) 
     { 
      for (int i = 0; i < insertChars.length; i++) 
       { 
        if (Character.isDigit(insertChars[i])) 
         { 
          valid = false; 
          break; 
         } 
       } 
     } 
    else 
      fit = false; 
      if (fit && valid) 
        super.insertString(offset, str, a); 
      else if (!fit) 
         getToolkit().beep(); 
  } 
}  
 
class IntegerDocument3 extends PlainDocument 
{ 
 public void insertString(int offset, String str, AttributeSet a) throws BadLocationException 
  { 
   char[] insertChars = str.toCharArray(); 
   boolean valid = true; 
   boolean fit = true; 
    if (insertChars.length + getLength() <= 4) 
     { 
      for (int i = 0; i < insertChars.length; i++) 
       { 
        if (!Character.isDigit(insertChars[i])) 
         { 
          valid = false; 
          break; 
         } 
       } 
     } 
    else 
     fit = false; 
    if (fit && valid) 
       super.insertString(offset, str, a); 
    else if (!fit) 
       getToolkit().beep(); 
  } 
}    
class IntegerDocument4 extends PlainDocument 
{ 
 public void insertString(int offset, String str, AttributeSet a) throws BadLocationException 
  { 
   char[] insertChars = str.toCharArray(); 
   boolean valid = true; 
   boolean fit = true; 
    if (insertChars.length + getLength() <= 8) 
     { 
      for (int i = 0; i < insertChars.length; i++) 
       { 
        if (!Character.isDigit(insertChars[i])) 
         { 
          valid = false; 
          break; 
         } 
       } 
     } 
    else 
     fit = false; 
    if (fit && valid) 
       super.insertString(offset, str, a); 
    else if (!fit) 
       getToolkit().beep(); 
  } 
}
    
class IntegerDocument5 extends PlainDocument 
{ 
 public void insertString(int offset, String str, AttributeSet a) throws BadLocationException 
  { 
   char[] insertChars = str.toCharArray(); 
   boolean valid = true; 
   boolean fit = true; 
    if (insertChars.length + getLength() <= 20) 
     { 
      for (int i = 0; i < insertChars.length; i++) 
       { 
        if (Character.isDigit(insertChars[i])) 
         { 
          valid = false; 
          break; 
         } 
       } 
     } 
    else 
     fit = false; 
    if (fit && valid) 
       super.insertString(offset, str, a); 
    else if (!fit) 
       getToolkit().beep(); 
  } 
}
class IntegerDocument6 extends PlainDocument 
{ 
 public void insertString(int offset, String str, AttributeSet a) throws BadLocationException 
  { 
   char[] insertChars = str.toCharArray(); 
   boolean valid = true; 
   boolean fit = true; 
    if (insertChars.length + getLength() <= 20) 
     { 
      for (int i = 0; i < insertChars.length; i++) 
       { 
        if (Character.isDigit(insertChars[i])) 
         { 
          valid = false; 
          break; 
         } 
       } 
     } 
    else 
     fit = false; 
    if (fit && valid) 
       super.insertString(offset, str, a); 
    else if (!fit) 
       getToolkit().beep(); 
  } 
}
// The following methods are used to listen for events
// occurring on the buttons in this layout.
public void actionPerformed(ActionEvent e) 
{     
 Object source = e.getSource();
   if (source == clearBtn) 
      {
            txt3.setText("");
            txt4.setText("");
            txt5.setText("");
            area.setText("");
            message.setText("Please enter Employee details");
        }
               
   if (source == exitBtn)
      {            
       int confirm = JOptionPane.showOptionDialog 
       (null, " Do you really have to go?", "Exit Confirmation",
       JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, null, null);
       if (confirm == 0) 
         {          
           System.exit(0);
         }
      }
}
                class MyItemListener implements ItemListener 
                    {
                        // This method is called only if a new item has been selected.
                        public void itemStateChanged(ItemEvent evt) 
                            {
                                JComboBox combo3 = (JComboBox)evt.getSource();
                        // Get the affected item
                                Object item = evt.getItem();
                        if (evt.getItem() == a) 
                            {
                              lbl12.setText( "Commerce" );
                            } 
                        else 
                            if (evt.getItem() == b) 
                            {
                              lbl12.setText( "Science" );
                            }
                        else 
                            if (evt.getItem() == d) 
                            {
                              lbl12.setText( "Engineering" );
                            }
                        else 
                            if (evt.getItem() == e) 
                            {
                              lbl12.setText( "Nursing" );
                            }
                        else 
                            if (evt.getItem() == f) 
                            {
                              lbl12.setText( "Hospitality" );
                            }
                            }
                    }        
} 

thanks all.
tom.

[tom brownlee]

Sorry Guys...
im using BlueJ to run my java code and therefore im using a TestRunner class to run my code. I didnt include the main() method to run the code when i posted it to you.
here it is

 public static void main( String[] args ) 
        {
            EmployeeDetails ed = new EmployeeDetails( new JFrame() );
        }

tom

[tom brownlee]

Well ive discovered a crude but working way to implement my validation but now i need to know how to store user information ( firstname, lastname etc) into a hashtable and retrieve this information based upon the employee code entered in the employee code textfield.
therefore when the first code and password are valid the employee code is entered which should return the information of the appropriate employee with that code, but if it doesnt the user can enter new information and then store this via a GUI "add" button
any help?

thanks guys

[Dirk Schreckmann]

tom,
I'm not sure I'm understanding your question(s). Your initial question seemed to be "What data structure should I use?" and you've apparently settled on a HashTable for at least some of the data. Now, regarding your most recent consideration, are you wanting the data to persist between uses of the application? Or is this simply a "How do I use a HashTable?" question?

[tom brownlee]

Hi dirk, , my apologise for the confusion
after i posted the question i conceived the answer i needed. my next question that you ask about is this.
how do i store (save) a users details (first name, last name etc.) so that when they enter or re-enter their "code" they will be able to see these entries (first name, last name etc).
also how do i implement saving details if the users code does not exist and they are able to enter details to be saved under this code
(and hence re-entering the code to see these newly added details) or when they wish to modify their details?
does that make more sense dirk?
thanks for the help, i truly appreciate it.
tom