Problem 344: Reverse String

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

基础题， 这道题的关键在于，学会数组和字符串之间的互相转换

public class Solution {
    public String reverseString(String s) {
        char[] arr = s.toCharArray();
        for (int i = 0; i < arr.length; i++) {
            arr[i] = s.charAt(s.length() - 1 - i);
        }
        return String.valueOf(arr);
    }
}

易错点

1. 数组元素首尾的对掉arr[i] = s.charAt(s.length() - 1 - i);

2. 数组和字符串之间转换