Can you use printf() in Java for a float and not have trailing zeroes, but still have all necessary decimals?

Question

So if I have the float variable interval and I want to print it, I want it to print with all of the necessary figures and no extra.

If I use System.out.printf("%f", interval); where float interval = 15 I get an output of 15.000000.

I can fix that by using System.out.printf("%2.0f", interval) to which I get an output of 15, but if I do that then where float interval = 12.05f I get an output of 12.

My assignment requires me to use printf().