BigDecimal valueOf() Method in Java

java.math.BigDecimal.valueOf(long val) is an inbuilt method in Java that translates a long value into a BigDecimal value with a scale of zero. It allows us, the reuse of frequently used BigDecimal values and hence this "static factory method" is provided in preference to a (long) constructor. Package view is as follows: 

--> java.math Package
    --> BigDecimal Class
        --> valueOf() Method

There are 3 types of variations in valueOf() method of BigDecimal class that are as depicted in syntax below via differing in parameters that are as follows:

• public static BigDecimal valueOf(long val)
• public static BigDecimal valueOf(double d)
• public static BigDecimal value(long l, int x)

Type 1: java.math.BigDecimal.valueOf(long val)

Parameters: The method accepts a single parameter val of Long data type and refers to the value that needs to be translated into a BigDecimal value.

Return value: The method returns a BigDecimal value of Long val.

Example:

// Java Program to Illustrate valueOf() Method
// of BigDecimal Class
// Over long As Arguments

// Importing required classes
import java.math.*;

// Class
public class GFG {

    // Main driver  method
    public static void main(String[] args)
    {

        // Creating and declaring long value by
        // creating object of Long class
        Long ln = new Long("745812345678");

        // Assigning above long value to BigDecimal
        BigDecimal b = BigDecimal.valueOf(ln);

        // Printing the BigDecimal value on console
        System.out.println(
            "The Converted BigDecimal value is: " + b);
    }
}

Output:

Type 2: java.math.BigDecimal.valueOf(double val) 

The java.math.BigDecimal.valueOf(double val) is an inbuilt method in java that translates a double into a BigDecimal, using the double's canonical string representation provided by the Double.toString(double) method.

Syntax: 

public static BigDecimal valueOf(double val)

Parameters: The method accepts a single parameter val of Double data type and refers to the value that needs to be translated into a BigDecimal value.

Return value: The method returns a BigDecimal value which is equal to or approximately equal to Double val. 

Example:

// Java Program to Illustrate valueOf() Method
// of BigDecimal Class
// Over Double type As Arguments

// Importing required classes
import java.math.*;

// Class
public class GFG {

    // Main driver method
    public static void main(String[] args)
    {

        // Creating a Double Object
        Double d = new Double("785.254");

        /// Assigning the bigdecimal value of d to b
        BigDecimal b = BigDecimal.valueOf(d);

        // Printing BigDecimal value on console
        System.out.println(
            "The Converted BigDecimal value is: " + b);
    }
}

Output:

Type 3: java.math.BigDecimal.valueOf(long unscaledVal, int scale) 

The java.math.BigDecimal.valueOf(long unscaledVal, int scale) is an inbuilt method in Java that is used to translate a long unscaled value and an int scale into a BigDecimal. This "static factory method" is provided in preference to a (long, int) constructor because it allows for reuse of frequently used BigDecimal values.

Syntax: 

public static BigDecimal valueOf(long unscaledVal, int scale)

Parameters: It takes two parameters: 

• unscaledVal: This is of Long data type and refers to the Unscaled value of the BigDecimal.
• scale: This is of Integer data type and refers to the Scale of the BigDecimal.

Return Value: A big decimal whose value is unscaled*10^-scale.

Example:

// Java Program to Illustrate valueOf() Method
// of BigDecimal Class
// Over (long, int) As Arguments

// Importing required classes
import java.math.*;

// Class
public class GFG {

    // Main driver method
    public static void main(String[] args) {
      
        // Creating a Long Object by
        // creating object of Long class type
        Long ln = new Long("789654");

        // Assigning the bigdecimal value to
        // BigDecimal with scale 3
        BigDecimal b = BigDecimal.valueOf(ln, 3);

        // Printing BigDecimal value on console
        System.out.println("The BigDecimal value is " + b);
    }
}

Output: