Using Javas System.out.format to align integer values

Question

I am trying to produce right aligned numbers looking a bit like this:

  12345
   2345

but I clearly does not understand the syntax. I have been trying to follow these instructions. and Come up with the following attempt (it is integers so d and I want width 7 and 0 decimals):

public class test {

    public static void main( String[] args ) {
        System.out.format("%7.0d%n", 12345);
        System.out.format("%7.0d%n",  2345);
    }
}

but no matter what I do I seem to end up with IllegalFormatPrecisionException. Is there a way to do this using this tool? If not how else would you do it?

The .0 is for floating point. You don't need it.

Peter Lawrey
– Peter Lawrey

2011-11-21 16:49:43 +00:00
Commented Nov 21, 2011 at 16:49 — Peter Lawrey
– Peter Lawrey, Commented Nov 21, 2011 at 16:49

Jack Edmonds · Accepted Answer · 2011-11-21 16:48:02Z

3

You can do something like this:

public class Test {
    public static void main( String[] args ) {
        System.out.format("%7d%n", 12345);
        System.out.format("%7d%n",  2345);
    }
}

Essentially this code asks Java to pad the string with spaces so that the output is exactly 7 characters.

answered Nov 21, 2011 at 16:48

Jack Edmonds

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1 Comment

Peter Lawrey Over a year ago

+1: You don't need the space. I would use %n instead of \n

Eng.Fouad · Accepted Answer · 2011-11-21 16:48:06Z

1

Do it like this:

public class test {

    public static void main( String[] args ) {
        System.out.format("%7d%n", 12345);
        System.out.format("%7d%n",  2345);
    }
}

answered Nov 21, 2011 at 16:48

Eng.Fouad

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Comments

Chris Cudmore · Accepted Answer · 2011-11-21 16:49:41Z

1

From the linked page, it shows this:

System.out.format("%,8d%n", n); // --> " 461,012"

You can omit the comma, and change the 8 to a 7

answered Nov 21, 2011 at 16:49

Chris Cudmore

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Yash · Accepted Answer · 2013-04-25 13:49:15Z

0

converter %d is for integers and %f is for float. "%7.0d%n" is used with a float(i.e., as %7.0f%n) and "%7d%n" is used for integer representation.this is the reason for IllegalFormatPrecisionException exception.

Reference link http://docs.oracle.com/javase/tutorial/java/data/numberformat.html

answered Apr 25, 2013 at 13:49

Yash

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