Java lang.Long.reverse() method in Java with Examples
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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.
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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 : 1152921504606846976The program below illustrates the java.lang.Long.reverse() function: Program 1 :
// 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)); } } |
The number after reversing bit= 1152921504606846976 The number after reversing bit= 9151314442816847872Program 2 : 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)); } } |
The number after reversing bit= 2305843009213693951 The number after reversing bit= 4683743612465315839Program 3 : 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)); } } |
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 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")); } } |
prog.java:16: error: incompatible types: String cannot be converted to long
+ Long.reverse("12"));
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