→ Week 5 Hierarchy, Inheritance, Superclasses And Subclasses → Začnite sa učiť / Stiahnite si MP3 Flashcards

otázka		Odpoveď
Inheritance goes from generalised to specialised. t/f? začať sa učiť		True
Describe inheritance using the is-a relationship concept začať sa učiť		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 začať sa učiť		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? začať sa učiť		yes eg:, a dog is-a mammal and it has-a leg/s
What does a subclass constructor look like začať sa učiť		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? začať sa učiť		No, private variables and methods are not inherited.
what is the word super used for? začať sa učiť		to refer hidden variables and overridden methods of the superclass
When can a subclass directly access super class members začať sa učiť		if they are declared publoc protected or default and are in the same package
does a subclass inherit data fields automatically? začať sa učiť		yes

Week 5 Hierarchy, Inheritance, Superclasses and Subclasses