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Java Long doubleValue() Method

Java doubleValue() method belongs to the Long class. This method returns the double equivalent of the Long after a widening primitive conversion(Conversion of a lower data type into a higher data type).

In short, this method is used to convert a Long object into a primitive double value.

Syntax:

public double doubleValue()  

Parameter:

No parameter is passed in this method.

Returns:

It returns double value of the long object.

Example 1:

Here, using the doubleValue() method, the long values are converted into its numerical double equivalent.

import java.lang.Long;

public class StudyTonight
{  
    public static void main(String[] args) 
    {  
        //converting Long object into double
        Long x = 99L;
        double i=x.doubleValue();
        System.out.println(i);       
          
        Long y = 23L;  
        double d = y.doubleValue();  
        System.out.println(d);
    }  
}    


99.0
23.0

Example 2:

Here is a user-defined example where anyone using this code can put a value of his choice and get the equivalent double value.

import java.util.Scanner;  

public class StudyTonight
{  
    public static void main(String[] args) 
    {  
        try
        {
            System.out.print("Enter the value to be converted : ");  
            Scanner sc = new Scanner(System.in);  
            long i = sc.nextLong();  
            Long n = i ;  
            double val = n.doubleValue();  
            System.out.println("Double Value is: " + val);  
        }
        catch(Exception e)
        {
            System.out.println("not a valid long"); 
        }
    }
}


Enter the value to be converted : 63
Double Value is: 63.0
**********************************************
Enter the value to be converted : -56
Double Value is: -56.0
**********************************************
Enter the value to be converted : 0x754
not a valid long

Live Example:

Here, you can test the live code example. You can execute the example for different values, even can edit and write your examples to test the Java code.