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Then I don't get it.

'vehicle' is the variable of the class Vehicle, right?
Obviously I am wrong, but when the vehicle is called, wouldn't it pull the constructor of the class Vehicle?

I cut and pasted from my first post, sorry. Adding those methods were the only things I did on my copy.

This is the same problem I've been having since yesterday. I am sorry; I am just not...

I keep getting a NullPointerException at this line, which is in the pAddVehicle class


vehicle.addItem(ma, mo,co, numD, numC, p);

import javax.swing.*;

public class PRJ03 extends JFrame
{
public static void main (String [] args)
{
Vehicle vehicle;
pAddVehicle pnlAdd;
pShowVehicle pnlShow;

Then I am confused. I thought if there was not a value assigned, it would refer to the constructor?

Ok, so I am back. The break worked somewhat, I got my other project done fast. This one is still stumping me.

So with that statement in main creating an instance of the Vehicle class and my...

I'll come back later. I am taking a break For food and to clear my head, like has been written.

Ok so in pAddVehicle class



private Vehicle vehicle;

Is instantiating the Vehicle class to use, right?

but in my Vehicle class, this

I'm sorry, I don't see why it didn't.

It is also null. I've referenced it and such, just like you were saying with the other problem. It is listed.

Sorry, just getting frustrated with this one. I've even tried stepping on to another...

pnlAdd.setOrderPanel(pnlShow);


I put that into my main program, if thinking right. And now get a NullPointerException at


vehicle.addItem(ma, mo,co, numD, numC, p);


which I already had...

We never called it in our class example and it worked. That is what is throwing me off then. What constructor then?

public void setOrderPanel(pShowVehicle p)
{
pnlShow = p;
}


I thought that is what this did? The only notes I have, is the program we did in class that day. So I am looking off...

That variable is just declaration of the pShowVehicle panel. You can print that?

That was new to me. I tried it and pnlShow has a null value. So i need to make a constructor on the pShowVehicle...

System.out.println(pnlShow.doSomething());


Ok, I put this line in right before that line and it can't resolve the println void. I know I am missing something common, but I can't think what. This...

When I ran it, it never showed up on that panel. Hmm, the method was what I was going to use to spit out the contents of the Vector.

When I attempt to add it back, I get the NullPointerException...

After I fixed all of it, I thought about this. It didn't click still why. Since in my pnlShow class, doSomething was written as:


public void doSomething()
{
...

After finding the line, it was this snippet of code:


pnlShow.doSomething();


Thank you so much for your help! Now to try and display the Vector

I'm sorry. Like I initially said, I've been up too long looking at different projects and code, my mind is melting. Ok, when I did that, I get this

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class pAddVehicle extends JPanel implements ActionListener
{
...

I am confused on what you are asking. My professor never explained that. It was more of a this is what you type, and this is what it does. If the program didn't do what he wanted, he got real quiet...

Ok sorry. In my txtOutput box, I get this:

java.lang.NullPointerException

Ok, I am trying to do another class project and I keep getting a NullPointerException showing up on the txtOutput line. The main goal of this project is to have a driver program with the 2 paned tab....