An abstract method defines the method name and arguments, but there's no method code Methods that subclasses should implement are declared abstract Instances of the The java drawing class JComponent is an example of this sort of common superclass with Get our RT class name -- just showing off // some of
OOP
6 août 2013 · 1 Abstract Classes • A Java class that cannot be instantiated, but instead Beer is a very general name for lots of different types of Concrete subclass is required to implement the abstract methods beersOnTap get(i)
AbstractClassesInterfaces
Classes, Objects, Inheritance, Abstract Classes and Interfaces 1 Constructors must have the same name as the class itself The get and set methods are used to read and in a subclass, the method defined in the superclass is hidden
L Java Classes Objects Inheritance Abstract recap
another class is called derived class, child class or subclass access class subclass_name extends superclass_name { abstract class {
JavaLab
The Java platform promotes portability by providing an abstraction over name or parameter's name with this or the class name followed by the member access access to the subclass's overriding method's access could be made private,
bbm A F
GeometricObject1 java +get Radius(): doubl e class ▻ If a subclass of an abstract superclass does not implement all the The interface name and the
slide
hierarchy of creating separate classes, using fields to get some aggregation going, but We can say that the Student class is a subclass of the Person class, or that We get a complaint from the Java compiler that name and age are private
inheritance
Object can shield variables from external access abstract public class abstract- base-class-name { Some subclass is required to override the abstract
advOO
Abstract Classes and Methods See Example 10 3 CheckingAccountClient java (next slide) Home CheckingAccount class cannot directly access balance name yes protected fields yes yes, by calling method from subclass methods yes
Chapter Class
This is achieved in Java by using the keyword final as follows: final class Marks The abstract methods of an abstract class must be defined in its subclass £ We cannot declare example marks (test1 and test 2 marks) and access methods } class Results multiple methods which have the same name, but different
Lecture