Formatting an int value

Question

I have an int ID which is a unique identifier within my code,
within lists I would like consecutive IDs to appear as 001,002, ... 009,010 etc
how do I go about adding preceding 0 placeholders to an int value?
The value must remain as an int, my specs do not permit me to parse it to a String value
I do remember coming across the methodology to perform this task a while back, but I cannot remember where I found it.
example:
int ID = 000; // initialize with '0' value, I want 3 places in the final value
ID = ++ID; // increment the ID within the constructor
System.out.print("ID = " + ID); // test the current value of ID
results in:
ID = 1
desired result would be
ID = 001
either direct 'How-To' or appropriate linkage would be appreciated

Answer 1

That was exactly what I had been looking for.
I knew I'd come across it when coding for a previous task, but for
the life of me I couldn't work out where <red face> I was missing
the "f" when I did my searches <doh>
I assume that if I then print the result to a file (with the preceding 0s)
that the placeholder 0s will be trimmed upon readback (as in my first
example), which will suit the specs of the task perfectly.
Many thanks