Null Pointer Exception in a GUI application

[Haani Naz]

Hi Guys,

i would like to extend this question by asking something about my code.

i'm basically attempting to use extended JFrame (to understand how it differs) but i've run into a problem.

i decided to post the code so it makes more sense:

package org.javaguitutorial.gui;
import javax.swing.*;

import java.awt.*;

public class FirstGUI extends JFrame {

	private JButton button1,button2,button3;
	
	private JPanel myPanel;
	
	

	public FirstGUI(){
			
				
		button1 = new JButton("shock me");
		button1 = new JButton("bliss");
		button1 = new JButton("huh?");
		
		
		myPanel = new JPanel();
		
                //add buttons to panel
		myPanel.add(button1);
		myPanel.add(button2);
		myPanel.add(button3);
		
		add(myPanel); //add panel to frame
		
		

followed by:

package org.javaguitutorial.gui;

import javax.swing.*;
import java.awt.*;

public class FirstGUI_driver {


	public static void main(String[] args) {
		
		FirstGUI gui = new FirstGUI(); 		
			
		gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //enable exit feature
		
		gui.setVisible(true); //make frame visible
		
		gui.setSize(275, 180); //set size of frame
		

This fails to work - i get run time errors. Can somebody please tell me why..? thanks.

[Campbell Ritchie]

Damn! I split the thread incorrectly. Please keep reading here.