Big Decimal provides an arithmetic that gives the results
that people expect, which is not available in Java today.
A decimal floating point arithmetic is
needed -- one which gives the same results as the arithmetic
that people learn at school.
Why IBM is offering this trial version: IBM is looking for
your evaluation and feedback on this technology. We want to
know that this works for you and is, in fact, useful. If so,
we will use your input through www.alphaworks.ibm.com/forums
in our proposals to make this extension of Java commercially
available to developers.
How it works: The BigDecimal class provides immutable
arbitrary-precision decimal numbers. The methods of the
BigDecimal class provide operations for fixed and floating
point arithmetic, comparison, format conversions, and
hashing. As the numbers are decimal, there is an exact
correspondence between an instance of a BigDecimal object
and its String representation; the BigDecimal class provides
direct conversions to and from String and character array
objects, and well as conversions to and from the Java
primitive types (which may not be exact) and BigInteger. The
internal representation of a decimal number is neither
defined nor exposed, and is not permitted to affect the
result of any operation. Operations on BigDecimal numbers
are controlled by a MathContext object, which provides
precision and other information. Default settings are used
if no MathContext object is provided.
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