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Java BigInteger Class | multiply() Method with Example

BigInteger Class multiply() method: Here, we are going to learn about the multiply() method of BigInteger Class with its syntax and example.
Submitted by Preeti Jain, on May 11, 2020

BigInteger Class multiply() method

• multiply() method is available in java.math package.
• multiply() method is used to represent the value of this BigInteger multiplied by the given argument.
• multiply() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• multiply() method does not throw an exception at the time of multiply.

Syntax:

    public BigInteger multiply(BigInteger val);

Parameter(s):

• BigInteger val – represents the value by which to multiply with this BigInteger.

Return value:

The return type of this method is BigInteger, it returns BigInteger that holds the value by using [ (this BigInteger) * (BigInteger val) ].

Example:

// Java program to demonstrate the example 
// of BigInteger multiply(BigInteger val)
// method of BigInteger

import java.math.*;

public class MultiplyOfBI {
    public static void main(String args[]) {
        // Initialize two variables str1, and str2
        String str1 = "100";
        String str2 = "2";

        // Initialize two BigInteger objects  
        BigInteger b_int1 = new BigInteger(str1);
        BigInteger b_int2 = new BigInteger(str2);

        // Display b_int1 and b_int2
        System.out.println("b_int1: " + b_int1);
        System.out.println("b_int2: " + b_int2);

        // multiplies this BigInteger b_int1 by the 
        // given BigInteger b_int2 like b_int1 * b_int2
        BigInteger mul_val = b_int1.multiply(b_int2);
        System.out.println("b_int1.multiply(b_int2): " + mul_val);
    }
}

Output

b_int1: 100
b_int2: 2
b_int1.multiply(b_int2): 200