Basic array question, need help

Hi, I hope someone can point me in the right direction.
I'll get it out of the way: Yes, I am a college student. No, I am not
looking for anyone to do my homework, just looking for help. I have been
reading this ng all semester, and found it very helpful. I just have a
stupid problem going on right now.

Here's the project:
We have to make a little frame with a text field, where the user inputs a
number, and a text area where a message is displayed. There are several
buttons on the frame: Enter, Average, Show Ascending, Show Descending,
Median, and High Number. We are to use an array to store up to 50 integers
the user enters.

Here's my problem:
My problem is that I can't figure out how to load the array. If I do it in
the Enter button event, then a new array is created each time an integer is
entered. I tested this by adding the current int to the int in the previous
cell. Oh, I am also storing the logical end of the array in the 0 cell. If
I try to load the array in the main, I get an error: Non-static method
load_aNum cannot be referenced from a static context. We had a project
previously where I used two arrays (pre-filled, not using input numbers),
and I loaded it in the main, and it worked fine. Don't know why this won't
work.

What I have so far (I've just been concentrating on getting the user numbers
to enter into the array. I'll worry about the rest of it later):

import java.awt.*;
import java.awt.event. *;
import java.math.*;
import java.util.Array s.*; //thought I might need this later for sorting
the array

public class khNumberDisplay er extends Frame implements ActionListener
{

private Button btnEnter, btnAvg, btnAscend, btnDescend, btnMedian,
btnHigh;
private TextField tfNum1 = new TextField (5);

private TextArea taMessage = new TextArea();

private int[] aNum;
private int lastSub =0;


/** Creates a new instance of khNumberDisplay er */
public khNumberDisplay er()
{


setTitle ("Number Displayer by Kelly");
setLayout (new FlowLayout());
add (new Label ("NUMBER "));
add (tfNum1);

add (new Label ("Message = "));
add (taMessage);

btnEnter = new Button ("Enter");
add (btnEnter);
btnEnter.addAct ionListener (new EnterHandler(th is));
addWindowListen er(new CloseWindow());

}


public void load_aNum()
{
aNum = new int[50];
aNum[0]++;
}

private static boolean isValid(int pInput)
{
boolean bResult;

bResult = (pInput >=0) && (pInput<=9999);

return bResult;
}



class EnterHandler implements ActionListener

{
khNumberDisplay er myFrame;
EnterHandler (khNumberDispla yer pFrame)
{
myFrame=pFrame;
}
public void actionPerformed (ActionEvent event)
{
myFrame.EnterSt uff();
myFrame.repaint ();
}
}


public void EnterStuff()
{
String sMessage;
boolean valid_test;
int num1;

num1 = Integer.parseIn t(tfNum1.getTex t());

//valid_test = (num1 >=1 && num1 <=200);
if (isValid(num1))
{


aNum[aNum[0]] = num1;
int total;
total = aNum[aNum[0]] + aNum[aNum[0]-1];
sMessage = "Number is valid. " + total;
}
else
sMessage = "Number is not valid";

taMessage.setTe xt(sMessage);


}

public void actionPerformed (ActionEvent event)
{
repaint();
}

public static void main (String []args)
{
Frame NumberDisplayer Window = new khNumberDisplay er();
NumberDisplayer Window.setSize (700,300);
NumberDisplayer Window.setBackg round(Color.pin k);
NumberDisplayer Window.show();
load_aNum();
}

public class CloseWindow extends WindowAdapter
{
public void windowClosing (WindowEvent e)
{
System.exit(0);
}
}

}
--
-Kelly
kelly at farringtons dot net
Check out www.snittens.com