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);
}
} |
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);
}
} |
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);
}
} |
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–