Exception in thread “main” java.lang.ArrayIndexOutOfBoundsException: 0 error in Java

Question

When i tried running this code I get this error..I dont know where i went wrong..

Exception in thread \"main\" java.lang.ArrayIndexOutOfBoundsException: 0
           


        

Answer 1

Are you supplying a command line argument when you run it?

if (args[0] != null)
    n = Integer.parseInt(args[0]);

If you aren't then the above line will fail. You should check if args.length >= 1 before accessing args[0].