BigDecimal multiply() Method in Java

Last Updated : 16 Oct, 2019

The java.math.BigDecimal.multiply(BigDecimal multiplicand) is an inbuilt method in java that returns a BigDecimal whose value is (this × multiplicand), and whose scale is (this.scale() + multiplicand.scale()). Syntax:

public BigDecimal multiply(BigDecimal multiplicand)

Parameters: This method accepts a single parameter multiplicand of BigDecimal type which refers to the Value to be multiplied by this BigDecimal. Return value: This method returns a BigDecimal whose value this * multiplicand. Below program illustrates the working of the above mentioned method: Program 1:

Java

// Java program to demonstrate the
// multiply() method

import java.math.*;

public class gfg {

    public static void main(String[] args)
    {

        // Assign two BigDecimal objects
        BigDecimal b1 = new BigDecimal("54.2");
        BigDecimal b2 = new BigDecimal("14.20");

        // Multiply b1 with b2 and assign result to b3
        BigDecimal b3 = b1.multiply(b2);

        // Print b3 value
        System.out.println("Multiplication is " + b3);
    }
}

Output:

Multiplication is 769.640

Program 2:

Java

// Java program to demonstrate the
// multiply() method

import java.math.*;

public class Gfg {

    public static void main(String[] args)
    {

        // Assign two BigDecimal objects
        BigDecimal b1 = new BigDecimal("-54.2");
        BigDecimal b2 = new BigDecimal("14.20");

        // Multiply b1 with b2 and assign result to b3
        BigDecimal b3 = b1.multiply(b2);

        // Print b3 value
        System.out.println("Multiplication is " + b3);
    }
}

Output:

Multiplication is -769.640

The java.math.BigDecimal.multiply(BigDecimal multiplicand, MathContext mc) is an inbuilt method in Java that returns a BigDecimal whose value is (this × multiplicand), with rounding according to the context settings. Syntax:

public BigDecimal multiply(BigDecimal multiplicand, MathContext mc)

Parameters: This method accepts two parameters:

multiplicand - This is of BigDecimal type and refers to the value to be multiplied by this BigDecimal.
mc - This refers to the context of rounding i.e., up to what decimal place the value is to be rounded off.

Return value: This method returns a BigDecimal whose value this * multiplicand, rounded as necessary. Program below demonstrates the method: Program 1:

Java

// Java program to demonstrate the
// multiply() method
import java.math.*;

public class Gfg {

    public static void main(String[] args)
    {

        // 4 precision
        MathContext m = new MathContext(4); 

        // Assign value to BigDecimal objects
        BigDecimal b1 = new BigDecimal("5.99");
        BigDecimal b2 = new BigDecimal("4.6");

        // Multiply b1 with b2 using m
        BigDecimal b3 = b1.multiply(b2, m);

        // Print b3 value
        System.out.println("Multiplication is " + b3);
    }
}

Output:

Multiplication is 27.55

Program 2:

Java

// Java program to demonstrate the
// multiply() method
import java.math.*;

public class Gfg {

    public static void main(String[] args)
    {

        // 4 precision
        MathContext m = new MathContext(4); 

        // Assign value to BigDecimal objects
        BigDecimal b1 = new BigDecimal("-5.99");
        BigDecimal b2 = new BigDecimal("4.6");

        // Multiply b1 with b2 using m
        BigDecimal b3 = b1.multiply(b2, m);

        // Print b3 value
        System.out.println("Multiplication is " + b3);
    }
}

Output:

Multiplication is -27.55

Reference:https://docs.oracle.com/javase/7/docs/api/java/math/BigDecimal.html#multiply(java.math.BigDecimal)

BigDecimal scale() Method in Java

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BigDecimal multiply() Method in Java

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