Java Mutable BigInteger Class

Question

I am doing calculations with BigIntegers that uses a loop that calls multiply() about 100 billion times, and the new object creation from the BigInteger is making it very slow.

Answer 1

JScience has a class call LargeInteger, which is also immutable, but which they claim has significantly improved perfomance compared to BigInteger.

http://jscience.org/

APFloat's Apint might be worth checking out too. http://www.apfloat.org/apfloat_java/