LeetCode 75. Sort Colors

public class Solution {    public void sortColors(int[] nums) {        if (nums == null || nums.length <= 1) return;        int r = 0;        int b = nums.length - 1;        int index = 1;        while (index <= b) {        if (nums[r] == 1) {        for (;index <= b;) {        if (nums[index] == 0) {        nums[r++] = 0;        nums[index++] = 1;        break;        } else if (nums[index] == 2) {        nums[index] = nums[b];        nums[b--] = 2;        } else index++;        }        } else if (nums[r] == 2) {        nums[r] = nums[b];nums[b--] = 2;        } else {        r++;        index++;        }        }    }}