java习题：倒序输出一行字符串

    public static void main(String[] args) {
        System.out.println("请输入一行字符串（按Enter执行）：");
        Scanner input = new Scanner(System.in);
        String str = input.next();
        daoxu(str);
    }
    
    /**
     * 将字符串倒序
     * @param str
     */
    public static void daoxu(String str) {
        String string = "";
        char [] ch = str.toCharArray();
        for (int i = ch.length-1 ; i > -1 ; i--) {
            string += ch[i] + "";    //将字符转化成为字符串
        }
        System.out.println("字符串倒序输出：\n" + string);
    }