Using String.format to remove particular digits from an integer

Question

Say we have a number

int number = 1234

and I want to use formatting to extract the final two digits as a string 34. How can one accomplish that?

I attempted:

String extraction = String.format("%d", number)

but this simply copies the entire number. I'm new to the syntax used by the formatter and can't seem to figure out the syntax that can go inside the characters of a number (or a String, for that matter) and pull them out. I've found a solution using charAt methods but am particularly curious about whether it's possible to accomplish it using formatting techniques.

Answer 1

Going via a String is inefficient and unnecessary to extract the last two digits of an integer.

Simply:

int lastTwoDigits = number % 100;

If you do want to go via a String, you can use:

String s = Integer.toString(number);
s = s.substring(s.length() - 2);
int lastTwoDigits = Integer.parseInt(s);

(note that this handles -ve numbers slightly differently to the first suggestion).