Jedi slides 2.1 object-oriented concepts

Object-oriented Concepts TOPIC ONE Object-oriented Software Engineering

Object-oriented Software Engineering ,[object Object]

[object Object],[object Object],[object Object],[object Object],Object Technology

[object Object],[object Object],[object Object],Benefits of Object Technology

[object Object],[object Object],Object

[object Object],[object Object],Object's State

[object Object],[object Object],Object's Behavior

[object Object],Object's Identity

[object Object],[object Object],[object Object],[object Object],Four Basic Principles of Object-orientation

[object Object],[object Object],[object Object],[object Object],Abstraction

Sample Abstraction ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],Encapsulation

Encapsulation Illustrated ,[object Object],[object Object],updateSquad(“Training”)

[object Object],[object Object],Modularity

Modularity Illustrated Ang Bulilit Liga Squad and Team System Club Membership Maintenance System Coach Information Maintenance System Squad and Team Maintenance System

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Hierarchy

Hierarchy Illustrated Squad Training Squad Competing Squad

[object Object],[object Object],[object Object],[object Object],[object Object],Generalization

[object Object],[object Object],Inheritance Squad Name Coach MemberList listMembers() changeCoach() Training Squad Competing Squad

Inheritance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Inheritance ,[object Object],[object Object],[object Object],[object Object]

Inheritance ,[object Object],[object Object],[object Object],public class Person { protected String name; protected String address; /** * Default constructor */ public Person(){ System.out.println(“Inside Person:Constructor”); name = ""; address = ""; } . . . . }

Inheritance ,[object Object],[object Object],[object Object],public class Student extends Person { public Student(){ System.out.println(“Inside Student:Constructor”); } . . . . }

Inheritance ,[object Object],[object Object]

Inheritance: ,[object Object],[object Object],public static void main( String[] args ){ Student anna = new Student(); } I nside Person:Constructor Inside Student:Constructor

The “super” keyword ,[object Object],[object Object],[object Object]

The “super” keyword ,[object Object],[object Object],public Student(){ super( "SomeName", "SomeAddress" ); System.out.println("Inside Student:Constructor"); }

The “super” keyword ,[object Object],[object Object],[object Object],[object Object]

The “super” keyword ,[object Object],[object Object],public Student() { super.name = “somename”; super.address = “some address”; }

Overriding methods ,[object Object],[object Object]

Example ,[object Object],public class Person { : : public String getName(){ System.out.println("Parent: getName"); return name; } }

Example ,[object Object],[object Object],public class Student extends Person{ : : public String getName(){ System.out.println("Student: getName"); return name; } : } Student: getName

Final Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],public final class Person { . . . }

Final Methods and Classes ,[object Object],[object Object],[object Object],[object Object]

Example public final String getName(){ return name; }

[object Object],[object Object],Polymorphism <<interface>> Asset getValue(); Stock getValue() ; Bond getValue(); Mutual Fund getValue();

Polymorphism ,[object Object],[object Object],[object Object],[object Object]

Polymorphism ,[object Object],[object Object]

Polymorphism ,[object Object],public static main( String[] args ) { Person ref; Student studentObject = new Student(); Employee employeeObject = new Employee(); ref = studentObject; //Person reference points to a // Student object }

Polymorphism ,[object Object],public class Student { public String getName(){ System.out.println(“Student Name:” + name); return name; } } public class Employee { public String getName(){ System.out.println(“Employee Name:” + name); return name; } }

Polymorphism ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Polymorphism ,[object Object],[object Object],public static printInformation( Person p ) { . . . . }

Polymorphism ,[object Object],public static main( String[] args ) { Student studentObject = new Student(); Employee employeeObject = new Employee(); printInformation( studentObject ); printInformation( employeeObject ); }

[object Object],[object Object],Interface

[object Object],Aggregation Team Athletes

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Jedi slides 2.1 object-oriented concepts

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