Double byteValue() Method in Java with Examples

Last Updated : 19 Jun, 2018

The java.lang.Double.byteValue() is a built-in method in Java that returns the value of this Double as a byte(by casting to a byte). Basically it used for narrowing primitive conversion of Double type to a byte value.

Syntax:

  public byte byteValue()

Parameters: The function does not accept any parameter.

Return Value: This method returns the double value represented by this object converted to type byte.

Examples:

  Input : 12  Output : 12    Input : 1023  Output : -1

Below programs illustrates the use of java.lang.Double.byteValue() function:

Program 1:

   // Program to illustrate the Double.byteValue() method 
import java.lang.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        Double value = 1023d; 
  
        // Returns the value of Double as a byte 
        byte byteValue = value.byteValue(); 
        System.out.println("Byte Value of num = " + byteValue); 
  
        // Another example 
        value = 12d; 
        byteValue = value.byteValue(); 
        System.out.println("Byte Value of num = " + byteValue); 
    } 
} 
 
  

Output:

  Byte Value of num = -1  Byte Value of num = 12

Program 2 : Demonstrates the byte value for a negative number.

   // Java code to illustrate java.lang.Double.byteValue() method 
import java.lang.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        Double value = -1023d; 
  
        // Returns the value of Double as a byte 
        byte byteValue = value.byteValue(); 
        System.out.println("Byte Value of num = " + byteValue); 
  
        // Another example 
        value = -12d; 
        byteValue = value.byteValue(); 
        System.out.println("Byte Value of num = " + byteValue); 
    } 
} 
 
  

Output:

  Byte Value of num = 1  Byte Value of num = -12

Program 3 : When a decimal value is passed in argument.

   // Program to illustrate java.lang.Double.byteValue() method 
  
import java.lang.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        Double value = 11.24; 
  
        // Returns the value of Double as a byte 
        byte byteValue = value.byteValue(); 
        System.out.println("Byte Value of num = " + byteValue); 
  
        // Another example 
        value = 6.0; 
        byteValue = value.byteValue(); 
        System.out.println("Byte Value of num = " + byteValue); 
    } 
} 
 
  

Output:

  Byte Value of num = 11  Byte Value of num = 6

Program 4 : When a string value is passed as argument.

   // Code to illustrate Double.byteValue() 
import java.lang.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        Double value = "45"; 
  
        // Returns the value of Double as a byte 
        byte byteValue = value.byteValue(); 
        System.out.println("Byte Value of num = " + byteValue); 
    } 
} 
 
  

Compile Errors:

prog.java:9: error: incompatible types: String cannot be converted to Double          Double value = "45";                         ^  1 error

Reference: https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html#byteValue–

Number.byteValue() Method in Java with Examples

Twinkl Bajaj

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Double byteValue() Method in Java with Examples

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