BigInteger multiply method in Java with examples

This post shows how to multiply BigIntegers in java with examples. use multiplication(*) operator for multiply biginteger in java.

You can also check my previous posts on the BigInteger class in java.

• BigInteger Class tutorials

• Convert BigInteger to/from BigDecimal

• Convert BigDecimal to/from String

• BigInteger Divide example

• Convert BigDecimal to float

• Convert BigDecimal to double

• Top 10 BigInteger Examples

• Rounding bigdecimal to 2 decimal places

• Check BigDecimal contains Zero or not

• Convert BigInteger to/from ByteArray

  In java, long or integers can be multiplied using the multiplication operator *.

The same does not work for BigInteger objects. It gives compilation error Operator ’*’ cannot be applied to ‘java.math.BigInteger’, ‘java.math.BigInteger’.

Here is an example using the multiplication operator

import java.math.BigInteger;

public class BigIntegerMultiply {
    public static void main(String[] args) {
        BigInteger operand1= BigInteger.valueOf(2);
        BigInteger operand2= BigInteger.valueOf(2);
        BigInteger result=operand1*operand2;
        System.out.println(result);
    }
}

It provides a multiply method to do multiplication on BigInteger.

#Java BigInteger multiply method with example

The multiply method returns the result of the multiplication of values.

BigInteger is immutable and the result of methods always returns a new object.

It internally uses an array of integers to do the process, The performance is less compared with Integer multiplication.

Syntax:

    public BigInteger multiply(BigInteger val)

This method called on the BigInteger object, takes the same type of parameter. Returns a new BigInteger object.

import java.math.BigInteger;

public class BigIntegerMultiply {
    public static void main(String[] args) {
        BigInteger operand1= BigInteger.valueOf(212312);
        BigInteger operand2= BigInteger.valueOf(2123);
        BigInteger result=operand1.multiply(operand2);
        System.out.println(result);
    }
}

Output:

450738376