Groovy 2.5.0 adds round and truncate methods to the BigDecimal class. These methods were already available on Double and Float classes. The methods can take an argument to denote the number of decimals the rounding or truncating must be applied to.

In the following example we see the methods with and without arguments:

def bigDecimal = 42.576135

// Groovy uses BigDecimal for decimal
// numbers by default.
assert == 'java.math.BigDecimal'

assert bigDecimal.round() == 43
assert bigDecimal.round(2) == 42.58

assert bigDecimal.trunc() == 42
assert bigDecimal.trunc(2) == 42.57

Written with Groovy 2.5.0.