26 remove duplicates from sorted array

https://leetcode.com/problems/remove-duplicates-from-sorted-array/

class Solution {
    public int removeDuplicates(int[] nums) {
        if (nums.length <= 1) {
            return nums.length;
        }
        //第一个绝对可以保留，i表示最后一个可以保留的数字
        int i = 0;
        for (int j = 1; j < nums.length; j++) {
            if (nums[i] != nums[j]) {
                nums[++i] = nums[j];
            }
        }
        return i + 1;
    }
}