Leetcode#75||Sort Colors

public class Solution {
public void sortColors(int[] nums) {
if (nums == null || nums.length < 2) {
return;
}

int length = nums.length;

int red = 0;
int white = 0;
int blue = length - 1;

while (white <= blue) {
if (nums[white] == 1) {
white++;
} else if (nums[white] == 0) {
int temp = nums[red];
nums[red] = nums[white];
nums[white] = temp;
white++;
red++;
} else if (nums[white] == 2) {
int temp = nums[blue];
nums[blue] = nums[white];
nums[white] = temp;
blue--;
}
}

return;
}
}