Write a function that takes a string as input and returns the string reversed.
Example:
Given s = "hello", return "olleh".
链接：https://leetcode.com/problems/reverse-string/?tab=Description
3/8/2017
第4行的语法要注意
1 public class Solution { 2 public String reverseString(String s) { 3 if (s == null || s.length() < 2) return s; 4 char[] c = new char[s.length()]; 5 for (int i = 0; i < s.length(); i++) c[i] = s.charAt(s.length() - i - 1); 6 return new String(c); 7 } 8 }
别人有更好的方法可参考：
https://discuss.leetcode.com/topic/43296/java-simple-and-clean-with-explanations-6-solutions/2