Java Number doubleValue() Method

The doubleValue() is a method of Java Number class which returns the value of the specified number casted as a double equivalent. This method may also involve in rounding or truncation.

Syntax:

Following is the declaration of doubleValue() method:

Parameter:

DataType	Parameter	Description
NA	NA	This method does not accept any parameter.

Returns:

The doubleValue() method returns the numeric value represented by this object after conversion to type double.

Exceptions:

Compatibility Version:

Java 1.0 and above

Example 1

public class NumberDoubleValueExample1 {
	public static void main(String[] args) {	
	     //Get a number as integer
	     Number x = 123456;	    
	     //Print their value as double
	     System.out.println("x as integer : " +x );
	     System.out.print("x as double: " + x.doubleValue());	    
	     }
}

Test it Now

Output:

x as integer : 123456
x as double: 123456.0

Example 2

import java.util.Scanner;
public class NumberDoubleValueExample2 {
	public static void main(String[] args) {
		//Input your value
		System.out.print("Enter the Desired Value : ");
		Scanner sc = new Scanner(System.in);
            //Get value from user console
		Integer i = sc.nextInt();		
		System.out.println("Double Value is: " + i.doubleValue());
		sc.close();
	      }
}

Output:

Enter the Desired Value : 987654321
Double Value is: 9.87654321E8

Example 3

public class NumberDoubleValueExample3 {
	public static void main(String[] args) {
		//Number as integer
        Integer x = 1234567898;
        //Print value as double
        System.out.println(x.doubleValue());
        //Number as float
        Float y = 934545876f;
        //Print value as double
        System.out.println(y.doubleValue());
        //Number as Double
        Double D = 53454.43654;
        //Print value as double
        System.out.println(D.doubleValue());
        //Number as Long
        Long L = 73454587659675454l;
        //Print value as double
        System.out.println(L.doubleValue());       
	    }
}

Test it Now

Output:

1.234567898E9
9.34545856E8
53454.43654
7.3454587659675456E16

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Java Number doubleValue() Method

Syntax:

Parameter:

Returns:

Exceptions:

Compatibility Version:

Example 1

Example 2

Example 3