So I'm just starting to learn Java, I'm fumbling ... below the line with the while in it but I couldn't get that working. edit: to clarify, I'd like to inform the user with the "values must ...

The Java Scanner class ... the same program. You do not need to instantiate it with the new keyword each time. To continually grab input from the user, you can use the Scanner’s hasNext() method as ...

In prior Java 101 articles ... in modern GUI (graphical user interface) operating systems, where people use it to debug malfunctioning programs and to teach input/output in entry-level programming ...