Java - Byte doubleValue() method

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Description

The Java Byte doubleValue() returns the value of this Byte as a double.

Declaration

Following is the declaration for java.lang.Byte.doubleValue() method

public double doubleValue()

Specified by

doubleValue in class Number

Parameters

NA

Return Value

This method returns the numeric value represented by this object after conversion to type double.

Exception

NA

Example 1

The following example shows the usage of Byte doubleValue() method with Byte object created using new operator. We're creating a Byte variable and assigned it an Byte object created using new operator. Then a byte variable is created and assigned a byte value using doubleValue() method and then result is printed.

package com.tutorialspoint;
public class ByteDemo {
   public static void main(String[] args) {

      // create a Byte object b
      Byte b;

      // assign value to b
      b = new Byte("100");

      // create a double primitive d
      double d;

      // assign primitive value of b to d
      d = b.doubleValue();

      String str = "Primitive double value of Byte object " + b + " is " + d;

      // print d value
      System.out.println( str );
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Primitive double value of Byte object 100 is 100.0

Example 2

The following example shows the usage of Byte doubleValue() method with Byte object created using valueOf(String) method. We're creating a Byte variable and assigned it an Byte object created using valueOf(String) method. Then a double variable is created and assigned a double value using doubleValue() method and then result is printed.

package com.tutorialspoint;
public class ByteDemo {
   public static void main(String[] args) {

      // create a Byte object b
      Byte b;

      // assign value to b
      b = Byte.valueOf("100");

      // create a double primitive d
      double d;

      // assign primitive value of b to d
      d = b.doubleValue();

      String str = "Primitive double value of Byte object " + b + " is " + d;

      // print d value
      System.out.println( str );
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Primitive double value of Byte object 100 is 100.0

Example 3

The following example shows the usage of Byte doubleValue() method with Byte object created using valueOf(byte) method. We're creating a Byte variable and assigned it an Byte object created using valueOf(byte) method. Then a double variable is created and assigned a double value using doubleValue() method and then result is printed.

package com.tutorialspoint;
public class ByteDemo {
   public static void main(String[] args) {

      // create a Byte object b
      Byte b;

      // assign value to b
      b = Byte.valueOf((byte) 100);

      // create a double primitive d
      double d;

      // assign primitive value of b to d
      d = b.doubleValue();

      String str = "Primitive byte value of Byte object " + b + " is " + d;

      // print d value
      System.out.println( str );
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Primitive byte value of Byte object 100 is 100.0