Game of Nim

package nimgame;

import java.util.Scanner;

/**
 *
 * @author Monty
 */
public class NimGame {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        int comNum, humanNum, stones, remove;
        double randNum;


        randNum = (30 - 15 + 1) * Math.random() + 15;
        stones = (int)randNum;
        comNum = 0;
        humanNum = 0;

        while (stones > 0) {
            remove = humanTurn(humanNum, stones);
            stones = remove;

            if (stones > 0){
                remove = comTurn(comNum, stones);
                stones = remove;
                if (stones <= 0) {
                    System.out.println("\nPlayer wins.");
                }
            } else {
                System.out.println("\nComputer wins.");
            }
        }


    }

    public static int comTurn(int comNum, int stones) {
        int remove;
        double num = (3 - 1 + 1) * Math.random() + 1;
        System.out.print("\nThere are " + stones + " stones. ");
        comNum = (int) num;
        comLegal(comNum, stones);
        remove = stones - comNum;
        stones = remove;
        System.out.print("The computer takes " + comNum + " stones.");
        return(remove);

    }

    public static int humanTurn(int humanNum, int stones) {
        int remove;
        Scanner input = new Scanner(System.in);
        System.out.print("\nThere are " + stones + " stones. How many would you like? ");
        humanNum = input.nextInt();
        humanLegal(humanNum, stones);
        remove = stones - humanNum;
        stones = remove;
        return(remove);
    }

    public static void comLegal(int comNum, int stones) {
        if (comNum < 1 || comNum > 3) {
            comTurn(comNum, stones);
        }
        if (stones - comNum < 0) {
            comTurn(comNum, stones);
        }
    }

    public static void humanLegal(int humanNum, int stones) {

        if (humanNum < 1 || humanNum > 3) {
            humanTurn(humanNum, stones);
        }

        if (stones - humanNum < 0) {
            humanTurn(humanNum, stones);
        }
    }

}