Right padding with zeros in Java

Question

Sorry if this question was made already, I've made a deep search and nothing.

Now, I know that:

String.format("%05d", price);

Will be padding my price with zeros to the left, so a price of 25 will result in 00025

What if I want to pad them to the right, so the result is 25000? How do I do that using only String.format patterns?

i've been there. there are some solutions. but none that does the job at once using only a pattern like the above — Caina Santos, Oct 18 '12 at 19:55

score 48 · Accepted Answer · edited May 23 '17 at 12:17

48

You could use:

String.format("%-5s", price ).replace(' ', '0')

Can I do this using only the format pattern?

String.format uses Formatter.justify just like the String.printf method. From this post you will see that the output space is hard-coded, so using the String.replace is necessary.

edited May 23 '17 at 12:17

Community

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answered Oct 18 '12 at 19:50

Reimeus

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got it, lets keep using the replace function than. thank you! – Caina Santos Oct 19 '12 at 17:47
it's useful answer. Thanks :D – S.J. Lim May 21 '15 at 08:44
I don't think it is a good answer. It is not maintainable and generic. Using a reusable function is more proper. – Samet ÖZTOPRAK Dec 02 '17 at 10:04

score 8 · Answer 2 · answered Dec 20 '13 at 05:44

8

Try this :

String RightPaddedString = org.apache.commons.lang.StringUtils.rightPad(InputString,NewStringlength,'paddingChar');

answered Dec 20 '13 at 05:44

Prasad D

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score 3 · Answer 3 · edited Apr 15 '14 at 20:18

Please try to read this doc, look if the library of apache commons StringUtils can help you

I've made a code like this :

import org.apache.commons.lang3.StringUtils;

public static void main(String[] args)  {   
  String str = "123";
  str = StringUtils.leftPad(str,10,"0"); //you can also look the rightPad function.
  System.out.println(str);
}

score 1 · Answer 4 · answered Apr 26 '17 at 10:38

Credits to beginnersbook.com, this is a working solution for the problem:

public class PadRightTest {
  public static void main(String[] argv) {
    System.out.println("#" + rightPadZeros("mystring", 10) + "@");
    System.out.println("#" + rightPadZeros("mystring", 15) + "@");
    System.out.println("#" + rightPadZeros("mystring", 20) + "@");
  }

  public static String rightPadZeros(String str, int num) {
    return String.format("%1$-" + num + "s", str).replace(' ', '0');
  }
}

and the output is:

#mystring00@
#mystring0000000@
#mystring000000000000@

score 1 · Answer 5 · answered Feb 08 '18 at 13:07

1

In my case I solved this using only native Java.

StringBuilder sb = new StringBuilder("1234");
sb.setLength(9);
String test = sb.toString().replaceAll("[^0-9]", "0");
System.out.println(test);

So it printed out : 123400000

answered Feb 08 '18 at 13:07

Rafael Nanes

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score 0 · Answer 6 · answered Aug 25 '17 at 16:05

0

if you want to do without format or any function then used this simple trick System.out.println(price+"000");

answered Aug 25 '17 at 16:05

Team Work

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1
7

The OP has requested that it needs to be done using String.format pattern. This approach though solves the requirement but is not flexible. What is instead of 25000 the developer wants 2500 or 250000. – Soumya Aug 25 '17 at 16:25

Samet ÖZTOPRAK · Answer 7 · 2017-12-03T16:30:53.253

0

Use this function for right padding.

private String rightPadding(String word, int length, char ch) {
   return (length > word.length()) ? rightPadding(word + ch, length, ch) : word;
}

how to use?

rightPadding("25", 5, '0');

edited Dec 03 '17 at 16:30

answered Dec 02 '17 at 10:00

Samet ÖZTOPRAK

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Right padding with zeros in Java

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