My java code is only outputting 0 when I use multiple classes and methods

I want to generate a random number between 1 and 6 and print it, but I keep getting 0 for the output. When I try putting the code in the Main class and main method only, it works, but not when I do it as I have below:

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

    System.out.println(Dice.randomRoll());

  }
}

This is my Main class above, Dice class below.

import java.util.*;

class Dice {

  private static int randomRoll;  

  public static void roll() {
     Random r = new Random();
     int low = 1;
     int high = 7;
     int randomRoll = r.nextInt(high-low) + low;
  }  

  public static int randomRoll() {
    return randomRoll;
  }

}

>Solution :

Method roll is never called, so the value of randomRoll is never changed. Try calling roll(); first in the randomRoll method.