反转字符串 ---- java

编写一个函数，其作用是将输入的字符串反转过来。输入字符串以字符数组 s 的形式给出。

不要给另外的数组分配额外的空间，你必须原地修改输入数组、使用 O(1) 的额外空间解决这一问题。

示例 1：

输入：s = ["h","e","l","l","o"]
输出：["o","l","l","e","h"]
示例 2：

输入：s = ["H","a","n","n","a","h"]
输出：["h","a","n","n","a","H"]

来源：力扣（LeetCode）
链接：https://leetcode-cn.com/problems/reverse-string
著作权归领扣网络所有。商业转载请联系官方授权，非商业转载请注明出处。

class Solution {
public void reverseString(char[] s) {
        int n = s.length;
        for (int i = 0; i < n / 2; ++i) {
            int j = n - 1 - i;
            s[i] ^= s[j];
            s[j] ^= s[i];
            s[i] ^= s[j];
        }
    }
}