Java Programming

My code is as follows, I'm only having a single error come up when I attemtp to compile, but I've spent 45 minutes trying to figure it out by searching Google and my textbook by I can't figure out what I'm doing wrong. The program is designed so that the user plays a game where the computer picked a number from 1-100 and tells higher or lower after each guess.

"Error: cannot find symbol variable reader" This is related to line 37, which is at the start of the method called "Guess()". I've tried declaring reader as a String variable, along with many other potential solutions. Any help is appreciated, thanks.

import java.io.*;
import java.util.*
;
public class Guessing
{

  private static int Rand;
  private static int Guess;
  private static int Counter;

  public static void main (String Args[]) throws IOException
  {
  // This section calls the initial two methods.
  // Other methods will be called from within if statements.
     Rand();
     Guess();
  }

   public static void Rand() throws IOException
   {
    // This gives a random integer from 1-100.
    Random Randomizer = new Random();
    Rand = Randomizer.nextInt(100) + 1;
   }

   public static void Guess() throws IOException
  {
    // Obtain the user's guess.
    Guess = reader.readInt("Guess what integer the computer picked between 1 and 100: ");

    // Three checks to make sure that the entered number is valid.
    if (Guess > 100){
          System.out.println("Your guess should be less than or equal to 100.");
          Guess();}
    if (Guess < 1){
          System.out.println("Your guess should be greater than or equal to 1.");
          Guess();}
    if (Guess % 1 != 0){
          System.out.println("Your guess must be an integer.");
          Guess();}

    // Move to the next method.
    Outcome();
  }
   // This method determines whether the number guessed is higher or lower than the random 1-100.
   public static void Outcome() throws IOException
   {
    if (Guess == Rand)
      Win();
    else
      if (Guess > Rand){
        System.out.println("Your guess was too high, try again!");
        Counter++;
        Guess();
        }
    else{
      if (Guess < Rand){
        System.out.println("Your guess was too low, try again!");
        Counter++;
        Guess();
            }
        }
    }

    // This method occurs when the user guesses the correct number
    public static void Win() throws IOException
    {
    System.out.println("Congratulations, You Win!");
    System.out.println("It took you " + Counter + " guesses!");
    }