Java lang.Long.reverse() method in Java with Examples Last Updated : 23 May, 2019 Summarize Comments Improve Suggest changes Share Like Article Like Report java.lang.Long.reverse() 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. Syntax: 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: Program 1 : CPP // 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 Program 2 : When a negative number is passed Java // 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 Program 3 : When a decimal number is passed Java // 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)); Program 4 : When a string number is passed Java // 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")); Comment More infoAdvertise with us Next Article Java lang.Long.reverse() method in Java with Examples G gopaldave Follow Improve Article Tags : Java Java-lang package Java-Functions java-Long Practice Tags : Java Similar Reads Java Tutorial Java is a high-level, object-oriented programming language used to build web apps, mobile applications, and enterprise software systems. 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