How to increment serial number?

[rawringbuny]

hi! i was doing wondering if there's a way to print out & increment 3-digit-serial no.?
i was planning to print out an invoice.
i want the starting of the invoice to be in this format YYYYMMDDNNN (where YYYY is the year, MM is month, DD is date & NNN is serial no (e.g: 001, 002, 003....) )

i've did the Year, month and date already. but when i want to print out the serial no. , it shows "1, 2 ..." instead of "001, 002"..

can someone help me?

this is the code i did so far.

package JPRG;
import java.util.Calendar;

public class ShoppingTransactionRecord {

    public static void main (String args[]){
        
      int serialNo = 000;
 
      Calendar cal = Calendar.getInstance();
 
      int date = cal.get(Calendar.DATE);
      int month = cal.get(Calendar.MONTH) + 1;
      int year = cal.get(Calendar.YEAR);
      

      for (int i=0;i<10;i++){
          serialNo++;
    System.out.println("Testing =====> " + year + month + date + serialNo);
      }
   }
 
}

[horace1]

you can use Java formatting

http://download.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html

http://java.sun.com/developer/technicalArticles/Programming/sprintf/

e.g.

    System.out.printf("Testing =====> %d%d%d%03d\n",  year , month , date , serialNo);

gives

Testing =====> 2011124001
Testing =====> 2011124002
Testing =====> 2011124003
Testing =====> 2011124004
Testing =====> 2011124005
Testing =====> 2011124006
Testing =====> 2011124007
Testing =====> 2011124008
Testing =====> 2011124009
Testing =====> 2011124010

you can set the field width for the other parameters to ensure the output is what you require

[Oralloy]

rawringbuny,

I think you want to use the static method String.format, with a format similar to the one in the example from horace1.

Luck!
Oralloy