BigDecimal multiply() Method in Java

1. 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 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 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
   

2. 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 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 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)