Partition Array by Odd and Even

public void partitionArray(int[] nums) {

        if (nums == null || nums.length == 0) {
            return;
        }

        int start = 0;
        int end = nums.length - 1;

        while (start < end) {
            while (start < end && nums[start] % 2 != 0) {
                start++;
            } 

            while (start < end && nums[end] % 2 == 0) {
                end--;
            }

            if (start < end) {
                int temp = nums[start];
                nums[start] = nums[end];
                nums[end] = temp;
                start++;
                end--;
            }

        }
    }