How to format numbers to same number of digits, 0-padded?

Question

I have several strings of different length

"2323"
"245"
"353352"

I need to convert them to string of the same size such as:

"0002323"
"0000245"
"0353352"

How can I automatically add the correct number of 0s in front of each string ?

thanks

What should happen if the input string is longer than the expected output format? — user, Commented Mar 23, 2011 at 9:21
you can also count the number of characters/digits in a string and then just append the desired number of values to the front which could be 0 or space or any other character. — AquaAlex, Commented Nov 15, 2013 at 18:55

Vladimir Ivanov · Accepted Answer · 2011-03-23 09:13:47Z

17

Use String.format:

Integer i = Integer.valueOf(src);
String format = "%1$07d";
String result = String.format(format, i);

answered Mar 23, 2011 at 9:13

Vladimir Ivanov

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1 Comment

aneuryzm Over a year ago

uhm ok. However src in my case is already a string and not an integer. Should I convert string > int > string ?

redent84 · Accepted Answer · 2011-03-23 09:19:04Z

5

Using DecimalFormat, String.format, or printf you can format a Number.

Example using DecimalFormat:

NumberFormat formatter = new DecimalFormat("0000000");
String number = formatter.format(2500);

Hope it helps.

Regards!

answered Mar 23, 2011 at 9:19

redent84

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Comments

Sean Patrick Floyd · Accepted Answer · 2011-03-23 09:22:05Z

4

Or use Apache Commons / Lang:

String s = "245";
String zeroPadded = StringUtils.leftPad(s, 6, '0');

Reference:

StringUtils.leftPad(String, length, padChar)

answered Mar 23, 2011 at 9:22

Sean Patrick Floyd

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