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)