Single Number - LeetCode

Given a non-empty array of integers, every element appears twice except for one. Find that single one.

Note:

Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory?

Example 1:

Input: [2,2,1]
Output: 1

Example 2:

Input: [4,1,2,1,2]
Output: 4

Java Solution :

class Solution {
    public int singleNumber(int[] nums) {
        if(nums == null) return 0;
        int result = 0;
        for(int i=0;i<nums.length;i++){
            result ^= nums[i];
        }
        return result;
    }
}