NullPointerException « JTextField « Java Swing Q&A

  1. Java Swing Q&A
  2. JTextField
  3. NullPointerException




1. NullPointerException in a JTextField.getText() inside a actionPerformed event    stackoverflow.com

I'm having a NullPointerException in a JTextField.getText() inside a actionPerformed event: 

import javax.swing.*;

public class myForm extends JInternalFrame
{
    private JTextField txtName;
    private String name;

    ...

2. JTextField.setText() throwing NullPointerException    stackoverflow.com

I'm trying to learn java and I am trying to make a simple calculator. For some reason I am getting a NullPointerException on my TextField.setText(). Here's my code: 

public static ...

3. NullPointerException when setting text of text field    stackoverflow.com

Can someone please help me because I have to get this project in by the end of tomorrow? Every time I try and set the text of a text field my program ...

4. NullPointerException - Using JTextField to Add Numbers    coderanch.com

I am learning Java and I have been working on a problem for about 20 hours but I continue to get a NullPointerException. I do not believe it makes sense after reviewing Sun's Java Tutorial and my text books. I am trying to add two numbers from text fields as a simple calculator. I have programmed (multiply, divide and subtract) to ...