Rotate Array II

Rotate an array of n elements to the right by k steps.

For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4].

Note:
Try to come up as many solutions as you can, there are at least 3 different ways to solve this problem.

This is same as Reverse Words in a String.  (https://leetcode.com/problems/reverse-words-in-a-string/)

 public class Solution {
     public void rotate(int[] nums, int k) {
         if(nums == null || nums.length == 0) return;
         int len = nums.length;
         k %= len;
         reverse(nums, 0, len - 1);
         reverse(nums, 0, k - 1);
         reverse(nums, k, len - 1);
     }

     public void reverse(int[] arr, int start, int end){
         while(start < end){
             int tmp = arr[start];
             arr[start] = arr[end];
             arr[end] = tmp;
             start ++;
             end --;
         }
     }
 }