How do I generate a random number and have the user guess whether or not a number is even or odd until they get it right?

  int userInput;

  Random randomNumbers = new Random();

  numberOne = randomNumbers.nextInt(100);

  System.out.print("Enter 0 for even or 1 for odd: ");
  userInput = keyboard.nextInt();
  label:
  while (userInput == 0)
  {

  if (userInput % 2 == 0)
     if (numberOne % 2 == 0)
     {
        System.out.println("Congradulations!");
        userInput--;
      }  


   }
  while (userInput == 1)
  {

  if (userInput % 2 != 0)
     if (numberOne % 2 != 0)
     {
        System.out.println("Congradulations!");
        userInput--;
     }

  }

When the input equals the number it says congratulations but when the input is incorrect it does not ask the user for another number.