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Java Float doubleValue() Method

Java doubleValue() method belongs to the Float class. This method returns the double equivalent of the Float 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 Float object into a double value.


public double doubleValue()  


No parameter is passed in this method.


The numerical equivalent of the object of a double type that is created after conversion.

Example 1:

Here, using the doubleValue() function and float values are converted into its numerical double equivalent.

import java.lang.Float;

public class StudyTonight
    public static void main(String[] args) 
        //converting Float object into double
          Float x = 99.12f;
          double i=x.doubleValue();
          System.out.println("Equivalent double value is " +i);
          Float y = 23.23f;  
          double d = y.doubleValue();  
          System.out.println("Equivalent double value is " +d);

Equivalent double value is 99.12000274658203
Equivalent double value is 23.229999542236328

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(;  
              float i = sc.nextFloat();  
              Float f = i ;  
              double val = f.doubleValue();  
              System.out.println("Double Value is: " + val);  
         catch(Exception e)
              System.out.println("not a valid float value"); 

Enter the value to be converted : 734.86
Double Value is: 734.8599853515625
Enter the value to be converted : 0x00.5
not a valid float value

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.