136. Single Number

Given an array of integers, every element appears twice except for one. Find that single one.

题目含义：给定的数组中，每个数字出现两次，只有一个数字出现了一次，找出这个数字

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