Java Mutable BigInteger Class?

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

JScience has a class call LargeInteger, which is also immutable, but which they claim has significantly improved perfomance compared to BigInteger. jscience.org/ APFloat's Apint might be worth checking out too. apfloat.org/apfloat_java.

I used Apfloat, and it was worse than bigdecimal. I'm not hopeful that apint will be better than BigInteger. – Fractaly Oct 23 at 2:38 using the jre/lib/endorsed as in the comment by Peter Lawrey might be the way to use MutableBigInteger – MarianP Oct 23 at 10:37.

I was able to do so without any problems, here is the code: public static void main(String args) throws Exception { Constructor constructor = Class. ForName("java.math. MutableBigInteger").

GetDeclaredConstructor(new Class {int. Class}); constructor. SetAccessible(true); Object x = constructor.

NewInstance(new Object {new Integer(1)}); Object y = constructor. NewInstance(new Object {new Integer(5)}); Method m = x.getClass(). GetDeclaredMethod("add", new Class { x.getClass()}); m.

SetAccessible(true); for (int I = 0; I Invoke(x, new Object {y}); } System.out. Println(x); } Output: 1 6 11 16 21 26 31.

The reason for wanting to use MutableBigInteger is performance. Using reflection would almost certainly result in much worse performance than using BigInteger. – Michael Borgwardt 2 hours ago.

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