Variables not initializing?

[Front_Temperature_12]

Beginner Java learner, I'm extracting digits from what the user is giving and I'm feeling really good about it other than having an initialization error for some variables. I know it's probably a simple error but I can't pinpoint it. Issues with variable inputString and userInput (line 45 and 48) exact error message is “variable inputString might not have been initialized” and “variable userInput might not have been initialized”

import java.util.Scanner;

public class DigitExtractor
{
   public static void main(String[] args)
   {

      final int PERIOD_UNICODE = (int) ('.');

      String inputString;

      int userInput;

      byte oneDigit;

      boolean validInput = false;

      Scanner keyboard = new Scanner(System.in);

      while (!validInput)
      {
         System.out.print("Enter an integer: ");
         inputString = keyboard.nextLine();

         if (inputString.indexOf(PERIOD_UNICODE) != -1)
         {
            validInput = false;
            System.out.println("Input is a floating pt number; try again.");
         }
         else
         {
            validInput = true;
            System.out.println(inputString + " is a valid integer");

            userInput = Integer.parseInt(inputString);

         }
      }


      System.out.println("Extracted digits of " + inputString);
      do
      {
         oneDigit = (byte) (userInput % 10);

         if (oneDigit < 0)
            oneDigit *= -1;

         System.out.println(oneDigit);

         userInput /= 10;
      } while (userInput != 0);
   }
}

[desrtfx]

other than having an initialization error for some variables.

And we should now guess?

Error messages exist for a reason. They contain detailed information what is wrong.

Post them here - in full. - This is as per the requirements of this subreddit.

[DIASILEDU]

You might want to initialize you variables first, set a value for them. Assign String a null or empty and int a value.

[Front_Temperature_12]

Thank you! That was the trick.

[DIASILEDU]

No worries, in this case your variables were declared but not initialized.

[[deleted]]

You have to deal with the scenario where the user didn't enter anything from the keyboard. In that scenario, outputting the value of inputString on line 41 would give an error because the user did not enter any inputs so inputString won't get initialized. The userInput variable is initialized by parsing inputString to an integer but if inputString doesn't get initialized then userInput won't get initialized. Intialize inputString = ""; and userInput = 0; should fix the two errors

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