检查回文

        String info = "上海自来水来自海上";
        for (int i = 0; i < info.length() / 2; i++) {
            if (info.charAt(i) != info.charAt(info.length() - 1 - i))
                        {                  
                System.out.println("不是回文");
                return;// 方法返回
            }
        }
        System.out.println("是回文");