GCD for array of numbers

/* package whatever; // don't place package name! */

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

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        // your code goes here
        System.out.println(gcd(9, 4));
        System.out.println(gcdNums(new int[]{2, 4, 6, 9}));
    }

    public static int gcdNums(int[] nums) {
        int result = nums[0];
        for (int i = 1; i < nums.length; i++) {
            result = gcd(result, nums[i]);
        }
        return result;
    }

    public static int gcd(int a, int b) {
        while (a != b) {
            if (a > b) {
                a = a - b;
            } else {
                b = b - a;
            }
        }

        return a;

    }
}