[LeetCode][String] 344. Reverse String

Problems https://leetcode.com/problems/reverse-string/

Solution:

class Solution {
    public void reverseString(char[] s) {
        int i = 0;
        int j = s.length -1;
        while (i < j) {
            char temp = s[i];
            s[i++] = s[j];
            s[j--] = temp;
        }
    }
}