Search:

You have to first compile, then run. The compiler executable is javac.exe: it turns your .java file into a binary class file. Then you use the java.exe executable to actually run the file.

The...

A class like Hello that is designed to be "run" with a main() is normally made public. Ie, is declared as "public class Hello { etc".

More importantly it must in a file Hello.java. The file name...