M08640010120114034M0864POK-p08 Inheritance

8/11/2019 M08640010120114034M0864POK-p08 Inheritance

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InheritanceSession 8

Course : M0864 - Programming I

Year : September 2011


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Bina Nusantara

Learning Outcomes

At the end of this session, the students will be

able to :

Apply the concept of inheritance on GUI in

Java


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Bina Nusantara

Lecture Outline

Inheritance (extends)

Overriding VS Overloading.

Inheritance Components


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Inheritance

Inheritence from superclass to subclass.

Subclass inherits and given the right to acces datamember ( fields/variables, methods, and nested classes

) that are existed in the Superclass except constructor.

Able to add new data member on Subclass.

Use extendsto access the parent class.

Bina Nusantara


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Inheritance

Bina Nusantara

A Subclass inherits all access to publicandprotectedfrom its Superclass, the packageofsubclass is not a concern.

If a subclass has the same packageassuperclass then subclass will inherits memberpackage-private from its superclassas well.

Is not allowed to receive multiple inheritancefrom more than one parents.


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Inheritance

In Java GUI programming, all class is definitely

inheritance, usually are inheritance from JFrame

GUI classes in Java can be modified.

Bina Nusantara


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Overriding VS Overloading

Overriding :

Subclass modifies method that has been defined by superclass.

Function that is declared by subclass should have the same

signature(name, numbers and data types of parameters) and

return value method with the existing one in the superclass

Overloading :

More than one functions that have the same name with the

existing one in the superclass.

Function that is declared in subclass does not have to have thesame signature (name, numbers and data types of parameter)

and return value method with the existing one in the superclass

Bina Nusantara


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Inherite Components

Self-create class that is an inheritance from one

component and contains of other GUI components

Generally are inheritance from class Container (JFrame,

JPaneland JApplet) that is most often to be inherited.

Usually is used to create a user control component.

Bina Nusantara


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Inherite Components

Bina Nusantara

Reusability class.

In designing User Interface (UI) Form, organize UIcomponents that have the functionality in 1 group in a

class that is handled by a Containerclasssuch as

JPanel.

Easy to modify screen design.


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Inherite Components Sample :

Bina Nusantara

MyInformationclass is a subclass of

JPaneland consists of components to

create a user control


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Inherite Components Sample in the caller class :

Bina Nusantara


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Inherite Components

Output

Bina Nusantara

Is an object of

Class MyInformation


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Bina Nusantara

Reference

Introduction to java programming comprehensive version, Chapter

10, Page 357

Software Java Solutions, Chapter 8, Page 467

http://home.cogeco.ca/~ve3ll/jatutor5.htm

http://download.oracle.com/javase/tutorial/java/IandI/subclasses.htm

l

http://download.oracle.com/javase/tutorial/java/concepts/interface.ht

ml
http://home.cogeco.ca/~ve3ll/jatutor5.htmhttp://download.oracle.com/javase/tutorial/java/IandI/subclasses.htmlhttp://download.oracle.com/javase/tutorial/java/IandI/subclasses.htmlhttp://download.oracle.com/javase/tutorial/java/concepts/interface.htmlhttp://download.oracle.com/javase/tutorial/java/concepts/interface.htmlhttp://download.oracle.com/javase/tutorial/java/concepts/interface.htmlhttp://download.oracle.com/javase/tutorial/java/concepts/interface.htmlhttp://download.oracle.com/javase/tutorial/java/IandI/subclasses.htmlhttp://download.oracle.com/javase/tutorial/java/IandI/subclasses.htmlhttp://home.cogeco.ca/~ve3ll/jatutor5.htm

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M08640010120114034M0864POK-p08 Inheritance