[deprosun]

This is the code. It runs fine in the netbeans but doesnt in the command line.
Below is my code and below that is the error I get in my command line when tried to run it.

import java.util.Random;

public class GenerateData {

    public static void main(String[] args) {
        Random numGen = new Random();

        int range = 10;
        int noi = 10;
        for (int i=0; i<noi;i++ ) {
            int NewGenNum = numGen.nextInt(range);
            System.out.println(NewGenNum);
        }

    }
}

myname> java GenerateData.java
Exception in thread "main" java.lang.NoClassDefFoundError: GenerateData/java
Caused by: java.lang.ClassNotFoundException: GenerateData.java
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: GenerateData.java. Program will exit.

[CasiOo]

you should write java GenerateData and not java GenerateData.java

Also the compiled classes are having a .class extension not .java

Aaaand did you compile your classes using javac ?

[deprosun]

CasiOo, on 13 September 2012 - 10:49 AM, said:

you should write java GenerateData and not java GenerateData.java

Also the compiled classes are having a .class extension not .java

Aaaand did you compile your classes using javac ?

Thanks for the response.

I tried doing java GenerateData too. No luck!
I checked my file it says .java as an extension.
Do not know what exactly javac is, but i used NetBeans to code it if that helps.

[CasiOo]

You have to compile your code before you can run it

javac GenerateData.java will compile your code

[jon.kiparsky]

javac is the compiler. You want to run that first:

>> javac GenerateData.java

If that succeeds - that is, if you see no output, and it just gives you a prompt - then you run the program by invoking a java virtual machine and giving your GenerateData class as the entry point:

>> java GenerateData


Notice that the first command operates on a source file, "GenerateData.java", which contains text. The second operates on a class, GenerateData, which java will find by looking in a file. That is, you don't want

>> java GenerateData.class

This will fail!

[deprosun]

Let me try..

WORKEDD!!! yess thank you so much all.