java日期

//今天上次的文件夹
String nowYearMonth = now.get(Calendar.YEAR) + ((now.get(Calendar.MONTH) + 1 < 10) ? "0"
      + (now.get(Calendar.MONTH) + 1) : "" + (now.get(Calendar.MONTH) + 1))
      + ((now.get(Calendar.DAY_OF_MONTH) < 10) ? "0" + (now.get(Calendar.DAY_OF_MONTH)) : ""
      + (now.get(Calendar.DAY_OF_MONTH)));