Java: Round to arbitrary values

Question

In Java, how do I round to an arbitrary value? Specifically, I want to round to .0025 steps, that is:

0.032611 -> 0.0325

0.034143 -> 0.0350

0.035233 -> 0.0350

0.037777 -> 0.0375

...

Any ideas or libs?

Answer 1

You could do this:

double step = 0.0025;
double rounded = ((int)(unrounded / step + 0.5)) * step;

Answer 2

y = Math.round(x / 0.0025) * 0.0025