Decimal rounding of a float data type in Java.

I need to display a float value on the screen with 2 decimal points and later 
use that value to perform validations. The problem is that the float value 
which calculated has 6plus decimal precision which is totally unwarranted. for 
e.g.
   3.00 - 1.70 - 0.20 - 0.20 = 0.89999999... instead of 0.90
Since my validations are based on 0.90 there is a mismatch.

Is there any way in which I can calculate the float value without unnecessary 
precision or at least display the right value of 0.90
 
Mangesh

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