overflow « biginteger « Java Data Type Q&A

1. Does BigInteger ever overflows?    stackoverflow.com

The API docs says

All of the details in the Spec concerning overflow are ignored, as BigIntegers are made as large as necessary to accommodate the results of an ...

2. Dealing with overflow in Java without using BigInteger    stackoverflow.com

Suppose I have a method to calculate combinations of r items from n items:

    public static long combi(int n, int r) {

       ...

3. Handling overflow with %    stackoverflow.com

I have a function Java which looks like this:

private static long fieldPrime = 4294967291L; // 2^32-5
public final static long modMult(long a, long b) {
    long r = ...