Java BigInteger Calculate multiply(BigInteger x, BigInteger y)

Description

multiply

License

Open Source License

Declaration

static BigInteger multiply(BigInteger x, BigInteger y) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.math.BigInteger;

public class Main {
    static BigInteger multiply(BigInteger x, BigInteger y) {
        final int bitLengthX = x.bitLength();
        final int bitLengthY = y.bitLength();
        if (bitLengthX <= 256 || bitLengthY <= 256 || addInts(bitLengthX, bitLengthY) <= 3600) {
            return x.multiply(y);
        }//w  w  w .j ava 2s.com
        return x.multiply(y);
    }

    public static int addInts(int a, int b) {
        if ((a > 0 && b > Integer.MAX_VALUE - a) || (a < 0 && b < Integer.MIN_VALUE - a)) {
            throw new ArithmeticException("int \"+\" overflow");
        }
        return a + b;
    }
}

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