Abstract Final Can Not Be Together

Rad studio common e2371.

Abstract final can not be together. So there if we make abstract class final then we wont be able to extend it. An abstract class does not need to contain abstract methods. You must add a return statement in method numberofstudent. We have to proved implementation to abstract methods in subclasses.

The abstract method display in type abstract class name can only set a visibility modifier one of public or protected. No an abstract class cannot be final abstract methods need to be implemented. And method declared as final mean dont override or redefine this method. Abstract and final are the mutual exclusive concept.

Therefore it is overridden in the sub class but by marking final we are restricting it to override compile time error will be thrown. Class school must be defined abstract. Native is not covered in more detail below since is a simple keyword that marks a method that will be implemented in other languages not in java. It works together with the java native interface jni.

Thats why java compiler throws a compile time error when you try to make an abstract class final in java. Final is a restrictive modifier used to prevent extension of a class or prevent overrides on methods while the abstract modifier signals the intention to use a class as a base class. The keywords public and abstract cannot be used together. Static final abstract synchronized volatile transient and native.

So the abstract and final combination is contradicting with each other. A class cannot be declared both abstract and final if a class contains one or more abstract methods then the class should be declared abstract or else a compile error will be thrown. No we can not declare abstract method as final. We have to proved implementation to abstract methods in subclasses.

An abstract class may contain both abstract methods as well normal methods. No we can not declare abstract method as final.