Can abstract class have protected constructor?

It makes little sense to have the public modifier on an abstract class constructor. After all, an abstract class cannot be created directly – only via a derived instance. … Hence, ReSharper recommends that you make the constructor protected .

Should abstract class have protected constructor?

An abstract class by definition cannot be instantiated directly. It can only be instantiated by an instance of a derived type. Therefore the only types that should have access to a constructor are its derived types and hence protected makes much more sense than public. It more accurately describes the accessibility.

Can we use protected in abstract class?

Declaring an abstract method protected

Yes, you can declare an abstract method protected. If you do so you can access it from the classes in the same package or from its subclasses.

Can abstract class can have constructor?

Yes! Abstract classes can have constructors! Yes, when we define a class to be an Abstract Class it cannot be instantiated but that does not mean an Abstract class cannot have a constructor. Each abstract class must have a concrete subclass which will implement the abstract methods of that abstract class.

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Can we use protected for constructor?

Protecting a constructor prevents the users from creating the instance of the class, outside the package. During overriding, when a variable or method is protected, it can be overridden to other subclass using either a public or protected modifier only. Outer class and interface cannot be protected.

Can abstract class have constructor in C#?

Question: Can an abstract class have a constructor? … Answer: Yes, an abstract class can have a constructor. In general, a class constructor is used to initialize fields. Along the same lines, an abstract class constructor is used to initialize fields of the abstract class.

What is protected constructor C#?

A protected constructor means that only derived members can construct instances of the class (and derived instances) using that constructor.

Can a subclass of an abstract class be abstract?

An abstract class is a class that is declared abstract —it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed. However, if it does not, then the subclass must also be declared abstract . …

Can we have protected class in C#?

4 Answers. Note that you cannot declare any outer class as private, protected (or protected internal) in c# since the access modifier for outer level classes defines their visibility in relation to other assemblies.

Can class be protected?

No, we cannot declare a top-level class as private or protected. It can be either public or default (no modifier).

Can abstract keyword be used with constructor?

Since you cannot override a constructor you cannot provide body to it if it is made abstract. Therefore, you cannot use abstract keyword with the constructor.

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Why does abstract class have constructor?

The main purpose of the constructor is to initialize the newly created object. In abstract class, we have an instance variable, abstract methods, and non-abstract methods. We need to initialize the non-abstract methods and instance variables, therefore abstract classes have a constructor.

Why Java interfaces Cannot have constructor but abstract classes can have?

An Interface in Java doesn’t have a constructor because all data members in interfaces are public static final by default, they are constants (assign the values at the time of declaration). There are no data members in an interface to initialize them through the constructor.

Can a constructor be protected in C++?

Typically, constructors have public accessibility so that code outside the class definition or inheritance hierarchy can create objects of the class. But you can also declare a constructor as protected or private . Constructors may be declared as inline , explicit, friend or constexpr.

Can we have protected constructor in C#?

The only way to cause a protected constructor to be called is to derive from the class and have the derived class delegate to it or to have a static method create it or some other internal method.

Can we override protected method as public?

Yes, the protected method of a superclass can be overridden by a subclass. If the superclass method is protected, the subclass overridden method can have protected or public (but not default or private) which means the subclass overridden method can not have a weaker access specifier.