Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException Java GUI Error


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I am trying to design a calculator in java. My code isn't finished but I have designed a GUI, which works except for when i try to actually calculate the result. When i press "=" on my calculator i receive the above error. Here is my code:GUI:import javax.swing.*;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;import java.awt.*;import java.io.IOException;public class CalcGUI extends JFrame implements ActionListener { /* * GUI for calculator */// Create varia

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Java: Exception in thread “AWT-EventQueue-0” java.lang.NullPointerException
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public class MainFrame extends JFrame {
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Java Exception in thread “AWT-EventQueue-0” java.lang.NullPointerException error
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I have tried to go over this my self but i do not know how to resolve this.


I am getting this error when i try and run my addressBookUi class.


Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
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at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
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at java.awt.EventQueue$3.run(Unknown Source)
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Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
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My first draft of my application was that I have the actionListener in the same class as class the one used to create my Jbutton in. this worked fine but I wanted to tidy it up. having a controller class which I create my frame and have my actionlistener in.


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public class Controller extends JPanel implements ActionListener {
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Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException Java GUI Error
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I am trying to design a calculator in java. My code isn't finished but I have designed a GUI, which works except for when i try to actually calculate the result. When i press "=" on my calculator i receive the above error. Here is my code:GUI:import javax.swing.*;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;import java.awt.*;import java.io.IOException;public class CalcGUI extends JFrame implements ActionListener { /* * GUI for calculator */// Create varia

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