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Showing content from https://www.geeksforgeeks.org/java/java-lang-long-reverse-method-java-examples/ below:

Java lang.Long.reverse() method in Java with Examples

Last Updated : 23 May, 2019

is a built-in function in Java which returns the value obtained by reversing the order of the bits in the two's complement binary representation of the specified long value.

public static long reverse(long num) 
Parameter :
num - the number passed
Returns : 
the value obtained by reversing the order of the bits in the 
two's complement binary representation of the specified long value.

Examples:

Input : 254 
Output : 9151314442816847872

Input : 8
Output : 1152921504606846976

The program below illustrates the java.lang.Long.reverse() function:

// Java program that demonstrates the
// Long.reverse() function

// include lang package
import java.lang.*;

public class GFG {

public static void main(String[] args)
    {

        long l = 8;

        System.out.println("The number after reversing bit= "
                           + Long.reverse(l));

        l = 254;
        System.out.println("The number after reversing bit= "
                           + Long.reverse(l));
    }
}

Output:

The number after reversing bit= 1152921504606846976
The number after reversing bit= 9151314442816847872

When a negative number is passed

// Java program that demonstrates the
// Long.reverse() function
// negative number

// include lang package
import java.lang.*;

public class GFG {

    public static void main(String[] args)
    {

        long l = -8;

        System.out.println("The number after reversing bit= "
                           + Long.reverse(l));

        l = -254;
        System.out.println("The number after reversing bit= "
                           + Long.reverse(l));
    }
}

Output:

The number after reversing bit= 2305843009213693951
The number after reversing bit= 4683743612465315839

When a decimal number is passed

// Java program that demonstrates the
// Long.reverse() function
// decimal number

// include lang package
import java.lang.*;

public class GFG {

    public static void main(String[] args)
    {

        System.out.println("The number after reversing bit= "
                           + Long.reverse(11.34));
    }
}

Output:

prog.java:16: error: incompatible types: possible lossy conversion from double to long
                           + Long.reverse(11.34));

: When a string number is passed

// Java program that demonstrates the
// Long.reverse() function
// string number

// include lang package
import java.lang.*;

public class GFG {

    public static void main(String[] args)
    {

        System.out.println("The number after reversing bit= "
                           + Long.reverse("12"));
    }
}

Output:

prog.java:16: error: incompatible types: String cannot be converted to long
                           + Long.reverse("12"));

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