Can abstract class have protected members?

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 have protected variables?

Abstract class can have concerete and abstract methods. The abstract class can have public, private, protected or default variables and also constants. … However, in the case of an abstract class, the method can be simply implemented in the abstract class and the same can be called by its subclass.

Can abstract class have members?

An abstract class can have a data member, abstract method, method body (non-abstract method), constructor, and even main() method.

Can abstract class have private members?

Abstract classes can have private methods. Interfaces can’t. Abstract classes can have instance variables (these are inherited by child classes).

Can abstract class be protected in C#?

Because If we declare an abstract class as sealed then, according to the property of the sealed keyword, the demo class cannot be inherited but, according to the property of the abstract keyword, an abstract class should be inherited. So a conflict will exist. So an abstract class cannot be declared as sealed.

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What is protected vs private?

private: The type or member can be accessed only by code in the same class or struct . protected: The type or member can be accessed only by code in the same class , or in a class that is derived from that class .

How can we call protected method from abstract class in Java?

2 Answers

  1. Create a new class that extends that abstract class SingleBrowserLocator (you will have to implement the abstract methods in it);
  2. Search for a non abstract subclass of SingleBrowserLocator that makes that method public or has other public methods that calls the protected one;

Can we use sealed class with abstract class?

A sealed class cannot be used as a base class. For this reason, it cannot also be an abstract class.

Can abstract class have sealed method?

When a class is declared sealed, it cannot be inherited, abstract classes cannot be declared sealed. … The sealed method should be part of a derived class and the method must be an overridden method.

Can an abstract class be private C#?

If a method of a class is private, you cannot access it outside the current class, not even from the child classes of it. But, incase of an abstract method, you cannot use it from the same class, you need to override it from subclass and use. Therefore, the abstract method cannot be private.

What happens if an abstract class has all the private members?

If a class has all the private members, which specifier will be used for its implicit constructor? Explanation: The implicit constructor will always be public. Otherwise the class wouldn’t be able to have instances. In turn, no objects will be created and the class can only be used for inheritance.

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Can abstract class be public?

Abstract classes are similar to interfaces. You cannot instantiate them, and they may contain a mix of methods declared with or without an implementation. However, with abstract classes, you can declare fields that are not static and final, and define public, protected, and private concrete methods.

Can we declare protected method in interface?

Protected members of an interface

In general, the protected members can be accessed in the same class or, the class inheriting it. But, we do not inherit an interface we will implement it. Therefore, the members of an interface cannot be protected.

Can abstract class inherit another abstract class?

Yes you can inherit abstract class from another abstract class. Yes you can inherit or extend one abstract class to another abstract class but if the class is a sealed class or single ton class at that time only inheritance cant be applicable.

Can abstract class inherit from non-abstract class C#?

C# Abstract Class Features

An abstract class can inherit from a class and one or more interfaces. An abstract class can implement code with non-Abstract methods. An Abstract class can have modifiers for methods, properties etc. … An abstract class cannot support multiple inheritance.

Can abstract class have non-abstract methods?

Yes we can have an abstract class without Abstract Methods as both are independent concepts. Declaring a class abstract means that it can not be instantiated on its own and can only be sub classed. Declaring a method abstract means that Method will be defined in the subclass.

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