Interface vs. Abstract class. •specify the form of a concept: not implementing it. •cannot have data members only constants. •lightweight to implement.
It can have abstract and non-abstract methods (method with body). It needs to be extended and its method imple- mented. It cannot be instantiated. Syntax:.
Then we need to have a method return an iterator over the elements in the list. This is An abstract method cannot have method body.
13 nov. 2020 If an inline method overrides/implements a nor- mal method then it must be retained (i.e. cannot be erased). Retained methods cannot have inline ...
Abstract methods have no implementations because the abstract classes are Constructors and static methods cannot be declared abstract.
It can have abstract methods(methods without body) as well as concrete methods (regular methods with body). A normal class(non-abstract class) cannot have
An abstract class cannot be instantiated. • A subclass of an abstract class can be The only fields they have must be declared static final. (constants.).
But abstract members cannot have private access modifier. 7. An Abstract class can has instance variables (like constants and fields). 8. An abstract class can
We need to call the copy constructor for the derived class to make an appropriate deep copy but copy constructors must be called by name
[ ] an abstract method. [ ] a public internal method. [ ] an internal method. [ ] a protected internal method. Q6. Which type of constructor cannot have a