1、题目：
Write a function that takes a string as input and returns the string reversed.
Example:
Given s = "hello", return "olleh".
2、代码实现：
代码实现1:
public static String reverseString(String s) {
if (s == null) {
return null;
}
if (s.length() == 0) {
return "";
}
int length = s.length();
char[] chars = s.toCharArray();
String result = "";
for (int i = chars.length - 1; i >=0; --i) {
result += chars[i];
}
return result;
}
代码实现2:
public String reverseString(String s) {
return new StringBuffer(s).reverse().toString();
}
