A DESCRIPTION OF THE REQUEST :
BigDecimal and BigInteger arithmetic does not default to decimal, non-floating point arithmetic mode.

BigDecimal a = new BigDecimal(0.1);
     
BigDecimal b = new BigDecimal(0.1);
     
BigDecimal x = a.multiply(b);
     
out.println(x.stripTrailingZeros().toPlainString());


JUSTIFICATION :
In order for this to produce the anticipated behaviour,
there must be a MathContext object submitted, scale
values set for a and b (or rounding performed on the multiply call), 
none of which should be necessary in this example.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Should print an answer of 

0.01

with no further configuration.
ACTUAL -
Instead prints out a floating point default result of

0.01000000000000000111022302462515657123851077828659396139564708135883709660962637144621112383902072906494140625

---------- BEGIN SOURCE ----------
import java.math.RoundingMode;
import java.math.MathContext;
import java.math.BigDecimal;
import static java.lang.System.out;

public class ArbitraryNumbers 
{
public static void main(String ... args)
{
BigDecimal a = new BigDecimal(0.1);
     
BigDecimal b = new BigDecimal(0.1);
     
BigDecimal x = a.multiply(b);
     
out.println(x.stripTrailingZeros().toPlainString());
}
}
---------- END SOURCE ----------