Java Byte doubleValue() method example

Important Notes:

• The method doubleValue() is specified by doubleValue in class Number.

public double doubleValue()

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

Requires Java 1.1 and up

Below is a simple java example on the usage of doubleValue() method of Byte class.

package com.javatutorialhq.java.examples;

import java.util.Scanner;

/*
 * This example source code demonstrates the use of 
 * doubleValue() method of Byte class.
 */

public class ByteDoubleValueExample {

	public static void main(String[] args) {

		/*
		 * Editor's Note
		 * Be extra careful in using this method
		 * as it uses widening concept
		 */
		
		// ask for user input
		System.out.print("Enter a number:");

		// read the user input
		Scanner s = new Scanner(System.in);
		String value = s.nextLine();
		s.close();
		
		Byte byteValue = new Byte(value);
		// convert byteValue into double
		double result = byteValue.doubleValue();
		
		System.out.println("double value is "+result);

		
	}

}

Basically on the above example, we have asked the user to enter a number on the console. Internally the input value is assign to a Byte object. We then use the doubleValue() method to convert it into type double. It doesn’t do much however it shows the basic behaviour of this method.

Below is the sample output when you run the above example.

• Java Byte Class Tutorial
• Java Tutorial

• Oracle Java Documentation