Java String Format array

Question

i am trying to format a string as follows

System.out.println("unique number is :"+ number[b]);
System.out.println("unique number formatted to 28  is :"+ String.format("%-28s",number[b]).replace(' ','0'))

there is no issue when "number" is a string that is shorter than 28, it adds the 0's to the left, but when the string is longer than 28 it dosnt shorten it, am i doing anything wrong ?

its an extract from a loop BTW

Many thanks

how do you want it shortend? Shortening numbers by cutting of digits normally doesn't make sense. — Jens Schauder
– Jens Schauder, Commented Apr 9, 2013 at 7:55

Keppil · Accepted Answer · 2013-04-09 07:56:44Z

1

The formatter doesn't cut your String, it only makes sure it uses at least 28 spaces.

You would have to do something like:

if (str.length() > 28) {
    str = str.subString(0, 28);
}

or maybe

if (str.length() > 28) {
    str = str.subString(str.length() - 28, str.length());
}

to limit the size.

answered Apr 9, 2013 at 7:56

Keppil

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Stephen C · Accepted Answer · 2013-04-09 09:12:09Z

0

The reason that format is not working as you expect is clear from the javadoc for the java.util.Formatter class. It says:

"The optional width is a non-negative decimal integer indicating the minimum number of characters to be written to the output."

edited Apr 9, 2013 at 9:12

answered Apr 9, 2013 at 8:20

Stephen C

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