344. Reverse String

Write a function that takes a string as input and returns the string reversed.

Example:
Given s = "hello", return "olleh".

题目含义：翻转字符串

    public String reverseString(String s) {
        char[] words = s.toCharArray();
        int left = 0,right = words.length-1;
        while (left<right)
        {
            char temp = words[left];
            words[left] = words[right];
            words[right] = temp;
            left++;
            right--;
        }
        return new String(words);     
    }