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Why can an abstract class have a constructor? As we can't create an object of it why would we need a constructor in an abstract class?
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Yes you should. Rules of having your own implementations for copy constructor, copy assignment operator and destructor for a Class will apply to even an Abstract Class.
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.
Yes, we can define a parameterized constructor in an abstract class.
These members include a constructor, because constructors aren't inherited.
In some cases we need to initialize the fields in the abstract class. If it is a empty constructor this is done implicit by the constructor in the child class, otherwise we use super(parameters). A constructor with parameters forces the child class to specify some parameters (not necessarily from its own parameters).
All in all, this means that the constructor is used by the child class constructor and not from the "outside".
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