Find the coolness of a number; coolness is number of zeros contained in the decimal representation of the number

Coolness.java

import java.io.*;
import java.util.*;

class Coolness
{
  public static void main(String[] args)
  {
    long num;

    long num1 = Long.parseLong(args[0]);
    long num2 = Long.parseLong(args[1]);

    System.out.println(findcoolness(num1));
    System.out.println(getNaiveNumCoolRange(num1, num2));
  }


  static int findcoolness(long num)
  {
    if(num == 0)
    {
      return 1;
    }

    int coolness = 0;

    while(num != 0)
    {
      // if its divisible by 10
      if(num % 10 == 0)
      {
        coolness++;
      }
      num /= 10;
    }

    return coolness;
  }

  static int getNaiveNumCoolRange(long start, long end)
  {
    if(start > end)
    {
      return 0;
    }

    return findcoolness(start) + getNaiveNumCoolRange(start+1, end);
  }
}