Fixed decimal numbers with JAVA

Question

How do I represent numbers in the format

001 = 1
002 = 2
003 = 3
010 = 10
020 = 20

The number of digits is always 3.

Answer 1

If you want to output integers such that they always have leading zeros, use String.format with a zero before the number of digits in the format string, for example:

int i = 3;
String s = String.format("%03d", i);
System.out.println(s);

Gives the output:

003