Could not find main class HelloWorld

Question

I installed Java 1.7.0 in the following folder C:\\Program Files\\Java. My operating system is Windows XP(Version 2002) with Service pack 3.

The envir

Answer 1

JAVA_HOME is not necessary if you start java and javac from the command line. But JAVA_HOME should point to the real jdk directory, C:\Program Files\Java\jdk1.7.0 in your case.

I'd never use the CLASSPATH environment variable outside of build scripts, especially not global defined. The -cp flag is better. But in your case, as you do not need additional libraries (rt.jardoesn't count), you won't need a classpath declaration. A missing -cp is equivalent to a -cp . and that's what you need here)

The HelloWorld class needs to be declared as public. This actually may be the cause for your problems. (I was pretty sure, that a source file needs one public class... or was it one public class at most ?)