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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.


public double doubleValue()  


No parameter is passed in this method.


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();
        Long y = 23L;  
        double d = y.doubleValue();  


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) 
            System.out.print("Enter the value to be converted : ");  
            Scanner sc = new Scanner(;  
            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.

About the author:
A Computer Science and Engineering Graduate(2016-2020) from JSSATE Noida. JAVA is Love. Sincerely Followed Sachin Tendulkar as a child, M S Dhoni as a teenager, and Virat Kohli as an adult.