Thread: issue with Character.isUpperCase class

Hi there, I'm having issues with my program. Only one part of the driver program is having issues. For that reason, I've only attached a small section of the code. I was wonder if anyone would be kind enough to explain why I keep having the errors:

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range

here is the code:

   import java.util.Scanner;
 
   public class characterTest
   {
      public static void main(String [] args)
      {
         Scanner input = new Scanner(System.in);
 
         String str;
 
         System.out.println("Enter string");
         str = input.next();
 
         int i, count3 = 0;
 
 
         for (i = 1; i <= str.length(); i++)
 
         {
            if (Character.isUpperCase(str.charAt(i)))
               count3++;
         }
 
         System.out.println("your upper char: " +count3);
      }
   }

Thank you for any advice!

Thanks Copeg for the hint. I'm very new to programming so it may take me a while to try to understand what you mean.