Java Programming - Help needed for Novice

[D2J]

Evening folks, Decided the other day I wanted to learn a programming language so have opted for Java and treated myself to a book.

 

I followed the instructions, downloaded the software etc and I'm following the book to the letter but the first program I did I get the error

 

Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld

 

I have tried this three times I get the same message when I try to run it..

 

Any ideas what I should do next

[LL200]

wanna post us some code to take a look at? dont be disheartened...

[D2J]

I'm not disheartened, just eager to learn

 

This is what the book said to type in the file

/* HelloWorld.java
    The classic first program
*/

public class HelloWorld {
   public static void main(String args[]) {
       System.out.println("Hello, World!");
   }//end method definition
}//end class definition

[LL200]

class HelloWorld {
   public static void main(String[] args) {
       System.out.println("Hello World");
   }
}

 

save as HelloWorld.java. Then:

 

javac HelloWorld.java
java HelloWorld

 

Make sure you get the right case as Java is case-sensitive. Make sure you 'cd' into the correct directory before running the commands. Make sure you get a .class file after running the javac command.

[LL200]

String args[] is not the same as String[] args. Thats probably your problem

[D2J]

I did that before and it didn't work and still won't, maybe its my laptop

[LL200]

have you set up your classpath correctly?

[D2J]

have you set up your classpath correctly?

 

I think so, just to make sure what should I do

[LL200]

man its been so long since i played with java...

 

either:

java --classpath . HelloWorld

 

or:

set CLASSPATH=c:\wherever\i\put\my\code

 

if you've not done the second, do the first one when you run your code. the . simply means the current directory.

[LL200]

...and i'm now beginning to wonder if String[] args is the same as String args[]...