Calendar.MONTH return 2. How to return 02

Question

String.valueOf(Calendar.getInstance().get(Calendar.MONTH) + 1) return 1 instead of 01. How can I use this that result will be 02, 03, 04 and not 2, 3, 4

I know that Calendar.MONTH return numbers from 0 to 11

http://docs.oracle.com/javase/6/docs/api/java/util/Calendar.html#MONTH

Answer 1

This is a formatting issue. Why not investigate SimpleDateFormat ? Or String.format() ?

(note that SimpleDateFormat has thread-safety issues and Joda-Time is a recommended alternative)

Answer 2

您可以改用

String.format("%02d", ...)

Answer 3

Use SimpleDateFormat:

    SimpleDateFormat dateFormat = new SimpleDateFormat("MM");
    System.out.println(dateFormat.format(date));

And I'd also recommend to use Joda Time instead of the Java Calendar.