[LeetCode] NO. 283 Move Zeroes

[题目] 

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:

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

[题目解析] 根据题意，所有0元素放到最后，非0元素依次前移。遍历数组，根据遍历顺序依次将非0元素装入新数组，然后后边的元素全部设为0即可。如下。

    public void moveZeroes(int[] nums) {
        int j = 0;
        for(int num : nums){
            if(0 != num){
                nums[j++] = num;
            }
        }
        while(j < nums.length){
            nums[j++] = 0;
        }
    }