How can we add leading zeros to the number in Java

Question

I want to add leading zeros to a number, on which I am going to perform further operations, how can I do that?

Answer 1

To add zeros to a number, we can use the code given below.

String modified = String.format("%03d", num);

System.our.println(modified);

Comments

Take more care - it's System.out.println, not System.our.println

Answer 2

From Java 1.5 you can use the String.format method. For example, 

String format = String.format("%%0%dd", digits);
String result = String.format(format, num);
return result;