reverse string

####QUESTION:
function that takes a string as input and returns the string reversed.

Example: Given s = “hello”, return “olleh”.

####SOLUTION:

public String reverseString(String s) {
    char[] chars = s.toCharArray();
    for (int i = (chars.length-1)>>1;i>=0;--i){
        char tmp = chars[i];
        chars[i] = chars[chars.length-1-i];
        chars[chars.length-1-i]= tmp;
    }
    return new String(chars);
}

####EXPLAIN:
也没有什么需要解释的，从中间开始两边互换，(chars.length-1)»1 获取到中间位置，然后就是左右互换的操作。

--> return <--