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.

Input: [0,1,0,3,12]
Output: [1,3,12,0,0]

Note:

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

代码：

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