CODEWITHSUNDEEP
javabiginteger
Alice
Alice

Reputation: 663

How can you specify a BigInteger with a maximum number of bits of type BigInteger?

I know BigInteger has a constructor where you can generate a random BigInteger by passing through the maximum bitLength of the new BigInteger and a random parameter:

BigInteger(int numBits, Random rnd)

How can you generate a random BitInteger where numBits is of type BitInteger not int? Note: I don't want to do myBitInteger.intValue().

Upvotes: 1

Views: 367

Answers (1)

John Kugelman
John Kugelman

Reputation: 361585

You can't. There is no constructor that takes a BigInteger number of bits.

Why not? BigInteger doesn't store the number of bits internally as a big integer. It's holds an int number of bits, a design decision reflected in the public API:

BigInteger(int numBits, Random rnd);
int bitCount();
int bitLength();
static BigInteger probablePrime(int bitLength, Random rnd);

Upvotes: 7

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