Get a 01 from an int instead of 1 in a for loop

Question

This loop inserts employee Ids like 1, 2, 4,.. 30.

for(int i=01;i<31;i++){
  Employee e = new Employee();
  e.setEmpId(i);
  aList.add(e);
}

However, I require the ids in the format 01, 02, 03 .. so on. Is there a simple way I can achieve this ?

I haven't downvoted, but it literally took me 20 seconds to google and find the solution. I suspect that played a part. — Jeroen Vannevel, Aug 21 '13 at 15:23

score 5 · Answer 1 · answered Aug 21 '13 at 15:17

5

ints don't have a format. They're numbers. Strings have a format. You can format a number using NumberFormat or DecimalFormat.

answered Aug 21 '13 at 15:17

Eric Stein

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Thanks for the insight. I wonder how else could I convey that I want the integers format to be different than what I got. – happybuddha Aug 21 '13 at 15:25

score 4 · Answer 2 · answered Aug 21 '13 at 15:18

4

This is more of a formatting issue. If the id is a number, the Empolyee.toString() or some similar function can format the id however you want.

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

Will zero padd the id to 2 places for you

answered Aug 21 '13 at 15:18

dkatzel

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Jeroen Vannevel · Accepted Answer · 2013-08-21T15:26:52.393

3

The ints will always be saved as '1'. If you want to display it as '01' then you can use something like this

public static void main(String[] args) {
    int i = 2;
    DecimalFormat twodigits = new DecimalFormat("00");
    System.out.println(twodigits.format(i));
}

Output:

edited Aug 21 '13 at 15:26

answered Aug 21 '13 at 15:20

Jeroen Vannevel

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`"00"` would be enough for this. – Marcelo Aug 21 '13 at 15:23
@Marcelo: You are correct, I have changed it accordingly. – Jeroen Vannevel Aug 21 '13 at 15:27

score 0 · Answer 4 · edited May 23 '17 at 10:30

0

You can use the Decimal Format

Add leading zeroes to number in Java?

edited May 23 '17 at 10:30

Community

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answered Aug 21 '13 at 15:18

VortexMath396

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score 0 · Answer 5 · answered Aug 21 '13 at 15:19

use String instead of int.

String istr = "";
for(int i=01;i<31;i++){
  Employee e = new Employee();
  if( i<10 )
    istr = "0" + i;
  else
    istr = "" + i;

  e.setEmpId(istr);
  aList.add(e);
}

of course you will need to have setEmpId(String s) method.

Get a 01 from an int instead of 1 in a for loop

5 Answers5