283. Move Zeroes

Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.

For example, given nums = [0, 1, 0, 3, 12], after calling your function, nums should be [1, 3, 12, 0, 0].

Note: You must do this in-place without making a copy of the array. Minimize the total number of operations.

public class Solution {
    public void moveZeroes(int[] nums) {
        int i=0;// 0's head
        while(i < nums.length && nums[i] != 0) i++;
        for(int j = i+1; j< nums.length; j++){
            if(nums[j] != 0){
                nums[i++] = nums[j];
                nums[j] = 0;
            }
        }
    }
}

public class Solution {
    public void moveZeroes(int[] nums) {
        int pos =0;
        for(int i=0; i< nums.length;i++){
            if(nums[i] != 0){
                nums[pos++] = nums[i];
            }
        }
        for(; pos < nums.length; pos++){
            nums[pos] =0;
        }
    }
}