Ghost in the code

[rainman33]

Here's a weird one. I compile and run this code, and get Bob Jones as the account holder, and a Withdrawel <sic> JTextField where there should not be one. Anybody help me on this one?

 
// Exercise 4.16: AccountInformation.java
// This application inputs and outputs account information.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
 
public class AccountInformation extends JFrame
{
   // JPanel to group deposit components
   private JPanel enterJPanel;
 
   // JLabel and JTextField for deposits
   private JLabel depositJLabel;
   private JTextField depositJTextField;
 
   // JButton to initiate balance calculation
   private JButton enterJButton;
 
   // JPanel to group account information components
   private JPanel accountJPanel;
 
   // JLabel and JTextField for account holder's name
   private JLabel nameJLabel;
   private JTextField nameJTextField;
 
   // JLabel and JTextField for account number
   private JLabel accountNumberJLabel;
   private JTextField accountNumberJTextField;
 
   // JLabel and JTextField for balance
   private JLabel balanceJLabel;
   private JTextField balanceJTextField;
 
   // no-argument constructor
   public AccountInformation() 
   {
      createUserInterface();
   }
 
   // create and position GUI components; register event handlers
   private void createUserInterface()
   {
      // get content pane and set layout to null
      Container contentPane = getContentPane();
      contentPane.setLayout( null );
 
      // set up enterJPanel
      enterJPanel = new JPanel();
      enterJPanel.setLayout( null );
      enterJPanel.setBounds( 16, 16, 152, 126 );
      enterJPanel.setBorder( 
         new TitledBorder( "Enter information" ) );
      contentPane.add( enterJPanel );
 
      // set up depositJLabel
      depositJLabel = new JLabel();
      depositJLabel.setText( "Deposit amount:" );
      depositJLabel.setBounds( 16, 40, 140, 16 );
      enterJPanel.add( depositJLabel );
 
      // set up depositJTextField
      depositJTextField = new JTextField();
      depositJTextField.setText( "0" );
      depositJTextField.setBounds( 16, 56, 120, 21 );
      depositJTextField.setHorizontalAlignment( JTextField.RIGHT );
      enterJPanel.add( depositJTextField );
 
      // set up enterJButton
      enterJButton = new JButton();
      enterJButton.setText( "Enter" );
      enterJButton.setBounds( 16, 150, 152, 34 );
      contentPane.add( enterJButton );
      enterJButton.addActionListener(
 
         new ActionListener() // anonymous inner class
         {
            // event handler called when enterJButton is pressed
            public void actionPerformed( ActionEvent event )
            {
               enterJButtonActionPerformed( event );
            }
 
         } // end anonymous inner class
 
      ); // end call to addActionListener
 
      // set up accountJPanel
      accountJPanel = new JPanel();
      accountJPanel.setLayout( null );
      accountJPanel.setBounds( 180, 16, 136, 170 );
      accountJPanel.setBorder( 
         new TitledBorder( "Account information" ) );
      contentPane.add( accountJPanel );
 
      // set up nameJLabel
      nameJLabel = new JLabel();
      nameJLabel.setText( "Name:" );
      nameJLabel.setBounds( 16, 24, 100, 16 );
      accountJPanel.add( nameJLabel );
 
      // set up nameJTextField
      nameJTextField = new JTextField();
      nameJTextField.setText( "Sue Purple" );
      nameJTextField.setBounds( 16, 40, 104, 21 );
      nameJTextField.setEditable( false );
      accountJPanel.add( nameJTextField );
 
      // set up accountNumberJLabel
      accountNumberJLabel = new JLabel();
      accountNumberJLabel.setText( "Account Number:" );
      accountNumberJLabel.setBounds( 16, 70, 140, 16 );
      accountJPanel.add( accountNumberJLabel );
 
      // set up accountNumberJTextField
      accountNumberJTextField = new JTextField();
      accountNumberJTextField.setText( "12345" );
      accountNumberJTextField.setBounds( 16, 86, 104, 21 );
      accountNumberJTextField.setEditable( false );
      accountNumberJTextField.setHorizontalAlignment( 
         JTextField.RIGHT );
      accountJPanel.add( accountNumberJTextField );
 
      // set up balanceJLabel
      balanceJLabel = new JLabel();
      balanceJLabel.setText( "Balance:" );
      balanceJLabel.setBounds( 16, 116, 100, 16 );
      accountJPanel.add( balanceJLabel );
 
      // set up balanceJTextField
      balanceJTextField = new JTextField();
      balanceJTextField.setText( "0" );
      balanceJTextField.setBounds( 16, 132, 104, 21 );
      balanceJTextField.setEditable( false );
      balanceJTextField.setHorizontalAlignment( JTextField.RIGHT );
      accountJPanel.add( balanceJTextField );
 
      // set properties of application's window
      setTitle( "Account Information" ); // set title bar text
      setSize( 325, 225 );               // set window size
      setVisible( true );                // display window
 
   } // end method createUserInterface
 
   // method called when enterJButton is pressed
   private void enterJButtonActionPerformed( ActionEvent event )
   {
      // display new balance
      balanceJTextField.setText( String.valueOf( 
         Integer.parseInt( depositJTextField.getText() ) - 
         Integer.parseInt( withdrawelJTextField.getText() ) ) );
 
      // clear depositJTextField
      depositJTextField.setText( "0" );    
 
   } // end method enterJButtonActionPerformed
 
   // main method
   public static void main( String[] args ) 
   {
      AccountInformation application = new AccountInformation();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
 
   } // end method main
 
} // end class AccountInformation
 
 

I just can't figure this out. I sent in the code to my teacher, and he says he can't figure it out, either. How can the text, "Bob Jones", appear, when it does not exist anywhere in the code?

Flummoxed.

[r035198x]

What is suprising me now is that on 151 you have

 ...Integer.parseInt( withdrawelJTextField.getText() ) ) );

and yet you have not defined a variable called withdrawelJTextField anywhere in your code.
Are you sure this compiles?

[rainman33]

I'm sorry. I guess it does not compile; it gives me that error. But it still runs the weird output. Could this be the reason? You can see on line 104 that the nameJTextField is set to "Sue Purple", and yet this text does not appear anywhere in the output. Instead, the text "Bob Jones" appears. Also, there is no code which sets up a withdrawelJLabel, yet this label appears in the output. I guess the first thing to do is to go ahead and code a withdrawelJLabel, as well as a withdrawelJTextField. But I'm still at a loss to figure out this screwy output. If I could figure out how to post an image in a reply, I would post the output. I guess I should have posted the outputted image in the first place.....

[r035198x]

I'm sorry. I guess it does not compile; it gives me that error. But it still runs the weird output. Could this be the reason? You can see on line 104 that the nameJTextField is set to "Sue Purple", and yet this text does not appear anywhere in the output. Instead, the text "Bob Jones" appears. Also, there is no code which sets up a withdrawelJLabel, yet this label appears in the output. I guess the first thing to do is to go ahead and code a withdrawelJLabel, as well as a withdrawelJTextField. But I'm still at a loss to figure out this screwy output. If I could figure out how to post an image in a reply, I would post the output. I guess I should have posted the outputted image in the first place.....

If the code does not compile, then a class file won't be created and you can't run the program. So which program is giving you the strange output?

[JosAH]

I guess the code that is running is not the code we're seeing here.

kind regards,

Jos