When a class inherits an abstract class and it does not implement?

When a class inherits an abstract class and it does not implement?

Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class. However, if it does not, then the subclass must also be declared abstract .

Can we create object for abstract class if not?

you can’t create a object of abstract class because there is an abstract method which has nothing so you can call that abstract method too. If we will create an object of the abstract class and calls the method having no body(as the method is pure virtual) it will give an error.

Can you inherit from a non-abstract class?

Yes, but if the class is marked as final, it can’t be extended. There are some concept confusions here. Unimplemented methods reside in an interface, and you can implement that interface. You can extend any class as long as its not final.

Can you create an object of an abstract class Why?

No, we can’t create an object of an abstract class. The reference variable is used to refer to the objects of derived classes (subclasses of abstract class). An abstract class means hiding the implementation and showing the function definition to the user is known as Abstract class.

Can a class inheriting an abstract class be instantiated?

It cannot be instantiated, or its objects can’t be created. A class inheriting the abstract class has to provide the implementation for the abstract methods declared in the abstract class. An abstract class can contain constructors, static methods, and final methods as well.

Which is better inheritance or composition in C #?

The SellingItem is an abstract base class (or interface in C#) What I am looking for here is an example that will challenge my argument –that is a scenario in which inheritance is better than composition even though the base class is non-abstract (base class can be instantiated). Can you please provide such an example?

How does an abstract class work in Java?

An abstract class can contain constructors, static methods, and final methods as well. Abstract keyword is used to declare a method abstract, and the method cannot have an implementation in the class where it is declared. The inheriting class has to provide the implementation for that abstract method.

Which is better, a real class or an abstract class?

Make an interface. Implement the interface in your base class. Make the base class a real class, not abstract (see below for why). The reason I prefer real classes instead of abstract classes is that abstract classes cannot be instantiated, which limits future options unnecessarily.