Zero padding to a given width

Question

How can I write a method with this header

public static String format (int number, int width)

that would return a string for the number with one or more prefix 0s. the size of the string is the width? example if use use format(43, 4) the output is 0043.

possible duplicate of [Add leading zeroes to number in Java?](http://stackoverflow.com/questions/275711/add-leading-zeroes-to-number-in-java) — assylias, Oct 07 '12 at 17:38
"Not a real question" seems problematic. There is enough there to go on, though ideally it would explain what was tried. — Mike Samuel, Oct 07 '12 at 17:39
The question is good, the attitude not really. The answer you will find in this http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html — Damian Leszczyński - Vash, Oct 07 '12 at 17:39

arshajii · Answer 1 · 2012-10-07T17:45:11.337

3

Try this:

public static String format(int number, int width) {
    return String.format("%0" + width + "d", number);
}

edited Oct 07 '12 at 17:45

answered Oct 07 '12 at 17:39

arshajii

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Because you used string concatenation in for, You do not use the language API that have solved this type of problem years ago. – Damian Leszczyński - Vash Oct 07 '12 at 17:41

Zero padding to a given width

1 Answers1