Java Error “Exception in thread ”main“ java.lang.ArrayIndexOutOfBoundsException”

Question

Here is this simple code from my book it produces error message in netbeans and in compile version (.class) version running through Command prompt.

Error Message

Answer 1

The args parameter in a class's main method is supplied by command line arguments. You are not invoking the jar with any command line args, so the array has no zero element.