How to "include" the class into the calling main()

Question

I posted yesterday and cant find the thread so apologize if its already answered. Question is, if you make a class, say Class QA, then if you call it from a file while has the main() in it, what do you include or add in this calling file that will tell it that there is a class A defined . (Main uses class A). I cant find this anuywhere- though I dont have many resources yet.
Thanks,
ns

Answer 1

I have the class in the same folder but it says on compile"
C:\java>java GUIFrameTest
Exception in thread "main" java.lang.NoClassDefFoundError: GUIFrameTest
C:\java>here is my dir:
C:\java>dir
Volume in drive C has no label.
Volume Serial Number is 07D1-0702
Directory of C:\java
09/29/2002 09:26a <DIR> .
09/29/2002 09:26a <DIR> ..
09/29/2002 10:02a 825 GUIFrame.java
09/29/2002 10:02a 1,370 GUIFrame.class
09/30/2002 05:50a 176 GUIFrameTest.java
7 File(s) 3,036 bytes
2 Dir(s) 8,337,620,992 bytes free
C:\java>and the test class is:
public class GUIFrameTest{
public static void main(String args[]){
GUIFrame frame = new GUIFrame("GUIFrame Test");
frame.setSize(400,300);
frame.setVisible(true);
Help!