→ Week 5 Hierarchy, Inheritance, Superclasses And Subclasses → Comece a aprender / Download de MP3 Flashcards

questão		resposta
Inheritance goes from generalised to specialised. t/f? começar a aprender		True
Describe inheritance using the is-a relationship concept começar a aprender		means that one class is a subclass of another. For example, a dog is a mammal, in other words a Dog class is a subclass of Mammals class.
descri aggregation using the has-a relationship concept começar a aprender		a dog has a leg (usually more than one). If in class Dog we declare a member variable of type Leg (another class) we don’t have inheritance, we have a has-a relationship (aggregation).
can we combine is-a and has-a relationships? começar a aprender		yes eg:, a dog is-a mammal and it has-a leg/s
What does a subclass constructor look like começar a aprender		public class Dog extends Mammals {private Leg [] legs; /* Leg is a class and legs is an array of objects of this type */ ...}
Does a subclass inherit all members of its parent class and predecesorclasses? começar a aprender		No, private variables and methods are not inherited.
what is the word super used for? começar a aprender		to refer hidden variables and overridden methods of the superclass
When can a subclass directly access super class members começar a aprender		if they are declared publoc protected or default and are in the same package
does a subclass inherit data fields automatically? começar a aprender		yes

Week 5 Hierarchy, Inheritance, Superclasses and Subclasses