Move Zeros

Description:

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.

EXAMPLE:

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

Solution:

Basic idea is to move all the non-zero elements to the front of the array, and set the elements at the tail to zero.

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