Rounding BigDecimal Values
In addition to precise calculations, BigDecimal also gives you control over how values are rounded—by default all calculations are exact and no rounding occurs. If you do not specify how to round BigDecimal values and a given value cannot be represented exactly—such as the result of 1 divided by 3, which is 0.3333333...—an ArithmeticException occurs.
Though we do not do so in this example, you can specify the rounding mode for BigDecimal by supplying a MathContext object (package java.math) to class BigDecimal’s constructor when you create a BigDecimal. You may also provide a MathContext to various BigDecimal methods that perform calculations. Class MathContext contains several pre-configured MathContext objects that ...
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