Java – which API can I use to format ints as 2 digits?

What API can I use to format ints as 2-digit numbers?

For example, in this loop

for (int i = 0; i < 100; i++) {
   System.out.println("i is " + i);
}

What can I use to ensure that I print out things like 01, 02, 10, 55, etc. (assuming the range of 01-99)

Solution

You can do it simply

System.out.printf("i is %02d%n",i);

For more information, check the formatter's documentation Relevant parts include:

(in this special case, your mark is 0, the width is 2, and it is converted to d)

This formatting syntax can also be used in several other places, such as:

String str = String.format("i is %02d",i);