No objects of an abstract class can be created (except for base subobjects of a class derived from it) and no non-static data members of an abstract class can be declared.
Can an abstract class have data members?
An abstract class can have a data member, abstract method, method body (non-abstract method), constructor, and even main() method.
Do abstract classes have data?
a class that implements an interface must provide an implementation of all the methods of that interface. abstract classes may contain state (data members) and/or implementation (methods) abstract classes can be inherited without implementing the abstract methods (though such a derived class is abstract itself)
Can abstract classes have members C++?
Abstract classes (apart from pure virtual functions) can have member variables, non-virtual functions, regular virtual functions, static functions, etc. Objects of abstract classes cannot be insantiated.
Can abstract classes have constructors?
Like any other classes in Java, abstract classes can have constructors even when they are only called from their concrete subclasses.
Can an abstract class have an interface?
An abstract class can inherit a class and multiple interfaces. An interface cannot declare constructors or destructors. An abstract class can declare constructors and destructors. It can extend any number of interfaces.
Can abstract class have body?
Abstract methods cannot have body. Abstract class can have static fields and static method, like other classes. An abstract class cannot be declared as final. Only abstract class can have abstract methods.
Can abstract class have object?
We cannot create objects of an abstract class. To implement features of an abstract class, we inherit subclasses from it and create objects of the subclass. A subclass must override all abstract methods of an abstract class.