Still Exception in Thread Main

Question

The error message is as follows (from earlier post)
java.lang.NoClassDefFoundError: DataWatch/Start
Exception in thread "main"
Everything compiles fine. I have included the code with the correct formatting
I've tried the suggestions from my earlier post but to no avail. This is a sample of what I have...I'll try to make it as precise and short as possible
//generic import calls
public class MainMenu extends JFrame{
public static MainMenu app;
MainMenu(){
//stuff to create a window
//other stuff to finish the class
Then I have this class...it has been renamed since I've posted the original message due to a comment
//generic import calls
public class Start{
public static Start parent;
Start (){} //empty constructor
void init() throws IOException{
MainMenu app = new MainMenu();
public static void main (string args[]) throws IOException{
parent = new Start();
parent.init();
}Part of my class path is: C:\j2sdk1.4.2_03\bin;C:\j2sdk1.4.2_03\jre\bin
Any help would be greatly appreciated.

Answer 1

c:\javapro> java -cp . pack.Foo
Note the lack of "\pack" in the current path.
Classpath contains "." , the current directory. Soit
will look in "." for pack\Foo.class.I will try this when I get back tonight. I will try
to run some small java code today on another machine.
If everything goes good today, then I know it has
something to do with my class path (like you've been
saying). I will then re-install java and go from
there. Do you have any suggestions on what package I
should download? Your help is greatly
appreciated...probably more that you will ever know.
Thanks.If the above works, I don't think you necessarily need to reinstall. It seems that up to this point you and I have each misunderstood certain details of what the other has said.
The above example is nothing special or mysterious. It's the way things should be done all the time, just stripped down to the bare bones simplest case. I (and others here) generally advocate specifying the classpath with the -cp or -classpath arg rather than with the CLASSPATH evnironment variable.
If the above works, then probably your install is fine, and you can build on that. Read some of the below, write some code, ask some questions until you get a better handle on classpath. If you take the above to "the next step" complexity-wise (whatever that would be) and it doesn't work, then maybe you've made a mistake, or maybe there is a problem with your installation. At this point, the latter seems unlkely.
One or more of the following should have some good explanations and examples of how classpath and packages work.
http://java.sun.com/docs/books/tutorial/
http://java.sun.com/learning/new2java/index.html
http://javaalmanac.com
http://www.jguru.com
http://www.javaranch.com
Bruce Eckel's Thinking in Java
Joshua Bloch's Effective Java
Bert Bates and Kathy Sierra's Head First Java