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Thread: setText Not Working

  1. #1
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    Default setText Not Working

    Hi, I'm taking my first Computer Science class currently and have come to a problem with one of my codes.

    // Tutorial 5: Inventory.java
    // Calculates the number of items in a shipment based on the number
    // of cartons received and the number of items per carton.
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    public class Inventory extends JFrame
    {
       // JLabel and JTextField for cartons per shipment
       private JLabel cartonsJLabel;
       public JTextField cartonsJTextField;
       // JLabel and JTextField for items per carton
       public JLabel itemsJLabel;
       public JTextField itemsJTextField;
       // JLabel and JTextField for total items per shipment
       private JLabel totalJLabel;
       public JTextField totalResultJTextField;
       // JButton to initiate calculation of total items per shipment
       private JButton calculateJButton;
       // no-argument constructor
       public Inventory()
       {
          createUserInterface();
       }
       // create and position GUI components; register event handlers
       public void createUserInterface()
       {
          // get content pane and set layout to null
          Container contentPane = getContentPane();
          contentPane.setLayout( null );
          // set up cartonsJLabel
          cartonsJLabel = new JLabel();
          cartonsJLabel.setText( "Cartons per shipment:" );
    	  cartonsJLabel.setBounds( 16, 16, 130, 21 );
          contentPane.add( cartonsJLabel );
          // set up itemsJLabel
          itemsJLabel = new JLabel();
          itemsJLabel.setText("Items per Carton:");
    	  itemsJLabel.setBounds(16, 48, 104, 21);
          contentPane.add( itemsJLabel );
          // set up totalJLabel
          totalJLabel = new JLabel();
          totalJLabel.setText("Total:");
    	  totalJLabel.setBounds(204, 16, 40, 21);
          contentPane.add( totalJLabel );
          // set up cartonsJTextField
          cartonsJTextField = new JTextField();
          cartonsJTextField.setText("0");
    	  cartonsJTextField.setBounds( 148, 16, 40, 21 );
    	  cartonsJTextField.setHorizontalAlignment(JTextField.RIGHT);
          contentPane.add( cartonsJTextField );
          // set up itemsJTextField
          itemsJTextField = new JTextField();
          itemsJTextField.setText("0");
    	  itemsJTextField.setBounds( 148, 48, 40, 21 );
    	  itemsJTextField.setHorizontalAlignment(JTextField.RIGHT);
          contentPane.add( itemsJTextField );
          // set up totalResultJTextField
          totalResultJTextField = new JTextField();
          totalResultJTextField.setBounds( 244, 16, 86, 21 );
    	  totalResultJTextField.setHorizontalAlignment(
    		  JTextField.RIGHT);
    	  totalResultJTextField.setEditable( false );
          contentPane.add( totalResultJTextField );
          // set up calculateJButton
          calculateJButton = new JButton();
          calculateJButton.setText("Calculate Total");
    	  calculateJButton.setBounds(204, 48, 126, 24);
          contentPane.add( calculateJButton );
          calculateJButton.addActionListener(
          	   new ActionListener() // anonymous inner class
             {
                // event handler called when calculateJButton is pressed
                public void actionPerformed( ActionEvent event )
                {
                   calculateJButtonActionPerformed( event );
                }
             } // end anonymous inner class
          ); // end call to addActionListener
          // set properties of application’s window
          setTitle( "Inventory" ); // set title bar text
          setSize( 354, 112 );     // set window size
          setVisible( true );      // display window
       } // end method createUserInterface
       //calculate the total items in the shipment
    	public void calculateJButtonActionPerformed( ActionEvent event )
    	{
    		int cartons; // stores number of cartons
    		int items;
    		int result;
    		//retrieve number from JTextFields
    		cartons = Integer.parseInt( cartonsJTextField.getText() );
    		items = Integer.parseInt( itemsJTextField.getText() );
    		result = cartons * items;
    		totalResultJTextField.setText( String.valueOf( result ) );
    	} // end method calculateJButtonActionPerformed
       public void cartonsJTextFieldKeyPressed( KeyEvent event )
       {
       		totalResultJTextField.setText( "" );
     
       }
       public void itemsJTextFieldKeyPressed( KeyEvent event )
       {
       		totalResultJTextField.setText( "" );
     
       }
    	public static void main( String[] args )
       {
          Inventory application = new Inventory();
          application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
       }
    }

    The program runs correctly by calculating, but the setText when KeyPressed doesn't work. Thanks in advance for your help.


  2. #2
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    Default Re: setText Not Working

    Code should be posted in the form of an SSCCE - that's a lot of code to demonstrate a single keyPressed and setText call, and your indentation makes the code pretty hard to read.

    I recommend you get rid of all the extra, then tell us exactly which line you're talking about, as well as what you mean by "doesn't work".

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  3. #3
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    Default Re: setText Not Working

    Alright, here's the part I'm having trouble with.

       public void cartonsJTextFieldKeyPressed( KeyEvent event )
       {
       		totalResultJTextField.setText( "" );
     
       }
       public void itemsJTextFieldKeyPressed( KeyEvent event )
       {
       		totalResultJTextField.setText( "" );
     
       }

    And when I say it doesn't work, I mean that when I press a key to get rid of what is already in the box, I want it to delete what's in the totalResult box.

  4. #4
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    Default Re: setText Not Working

    An SSCCE should still be runnable simply by copying and pasting it into an editor. For your case, your program should just be a single JTextField with whatever listener you're trying to get to work.

    When are those methods called? When do you add the KeyListener? What do you add it to?
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  5. #5
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    Default Re: setText Not Working

    Did you ever specify which key it is?

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