We will first learn what an abstract class and interface is We will also do a detailed comparison of interfaces and abstract classes, followed by a listing
//Creating abstract class that provides the implementation of one method of A interface 10 abstract class B implements A{
How hard would it be if instead we had classes ArrayQueue and CircularQueue but no interface Queue above them? The difference would be more dramatic with a
An abstract method has only a declaration and no method body (i e no definition): abstract void f(); • The class containing an abstract method MUST be
An abstract class in a class hierarchy represents a generic concept A Java interface is a collection of abstract methods and constants
public abstract class GeometricObject { private String color = "white"; private boolean filled; private java util Date dateCreated;
Abstract classes and Interfaces ▻ Difference between extends and implements ▻ Multiple inheritance ▷ Comparator and Comparable ▻ Comparing objects
abstract class B extends A //abstract non obligatoire ici mais conseillé Soit sous forme d'interface de méthodes abstraites dont on est