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// Shift non-zero values as far forward as possible
// Fill remaining space with zeros

public void moveZeroes(int[] nums) {
    if (nums == null || nums.length == 0) return;        

    int insertPos = 0;
    for (int num: nums) {
        if (num != 0) nums[insertPos++] = num;
    }        

    while (insertPos < nums.length) {
        nums[insertPos++] = 0;
    }
}

public class Solution {
    public void moveZeroes(int[] nums) {
        if (nums == null || nums.length < 2 ) return;
        int i = 0;
        int j = 0;
        while (j < nums.length) {
            if (nums[j] != 0) {
                int temp = nums[i];
                nums[i] = nums[j];
                nums[j] = temp;
                i++;
            }
            j++;
        }
        return;
    }
}