将一个字符串进行反转

/**
 * 将一个字符串进行反转
 **/
private static String reverse(String str) {
    char[] chars = new char[str.length()];
    int len = str.length() - 1;
    for (int i = 0; i < str.length(); i++) {
        chars[i] = str.charAt(len - i);
    }
    return new String(chars);
}