当前时间加？分钟

 public static void main(String[] args) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date now = new Date();
        System.out.println("当前时间：" + sdf.format(now));

        Date afterDate = new Date(now.getTime() + 300000);
        System.out.println(sdf.format(afterDate));

        Calendar nowTime = Calendar.getInstance();
        nowTime.add(Calendar.MINUTE, 5);
        System.out.println(sdf.format(nowTime.getTime()));

    }