CS313D: ADVANCED PROGRAMMING LANGUAGE

Size: px
Start display at page:

Download "CS313D: ADVANCED PROGRAMMING LANGUAGE"

Transcription

1 CS313D: ADVANCED PROGRAMMING LANGUAGE Computer Science department Lecture 5: Inheritance & Polymorphism

2 Lecture Contents 2 What is Inheritance? Super-class & sub class Protected members Creating subclasses Polymorphism

3 OOP 3

4 OOP - Inheritance 4 A class can extend another class, inheriting all its data members and methods while redefining some of them and/or adding its own.

5 OOP - Inheritance 5 Inheritance represents the is a relationship between data types (e.g. student/person) Existing class is the superclass (more general) New class is the subclass (more specific) C# supports only single inheritance each class is derived from exactly one direct superclass. Possible to Create hierarchy of classes

6 Superclasses and Subclasses 6 Superclasses more general subclasses more specific. every subclass object is an object of its superclass

7 Protected Members 7 To enable a subclass to directly access superclass instance variables, we can declare those members as protected in the superclass. an intermediate level of access between public and private. can be accessed by members of that superclass, by members of its subclasses. All public and protected superclass members retain their original access modifier when they become members of the subclass. Not recommended to enforce information hiding

8 Example: CommissionEmployee Class 8 Inheritance hierarchy containing types of employees in a company s payroll application Commission employees are paid a percentage of their sales

9 The code 9 A colon (:) indicates inheritance Every C# class directly or indirectly inherits object s methods.

10 10

11 11

12 virtual!! 12 A virtual method is ready to be overridden in the subclasses

13 Override!! 13 To override a base-class method, a derived class must declare a method with keyword override. the same signature

14 Creating a new class!! 14 Base-salaried commission employees receive a base salary plus a percentage of their sales. Class BasePlusCommissionEmployee: Data: first name, last name, social security number, gross sales amount, commission rate and base salary. (( All but the base salary are in common with class CommissionEmployee)). services: a constructor, and methods earnings, tostring and get and set for each instance variable ((Most are in common with class CommissionEmployee ))

15 Creating a new class 15 Copy & paste Inheritance copy CommissionEmployee code, pasted it into BasePlusCommissionEm ployee modify the new class to include a base salary and methods that manipulate the base salary. error prone time consuming. Too many copies of the same code bad maintenance Extend an existing class and add only the needed data/functionality Reusability Don t reinvent the wheel!!

16 The new class 16 Constructors are not inherited : The derivedclass constructor, before performing its own tasks, invokes its direct base class s constructor

17 17

18 18

19 19 Tip!!

20 Test 20

21 21

22 Polymorphism 22 a superclass reference at a subclass object. (crossover) Allowed because each subclass object is an object of its superclass. The type of the referenced object, not the type of the variable, determines which method is called. Invoking a method on a subclass object via a superclass reference invokes the subclass functionality

23 Example 23 Same base references, different objects

24 Example 24 When the compiler encounters a virtual method call made through a variable, the compiler checks the variable s class type to determines if the method can be called.

25 25

26 26 Chapter 11 Chapter 12 : 12.3

27 27 Case Study

28 28

Lecture Contents CS313D: ADVANCED PROGRAMMING LANGUAGE. What is Inheritance?

Lecture Contents CS313D: ADVANCED PROGRAMMING LANGUAGE. What is Inheritance? CS313D: ADVANCED PROGRAMMING LANGUAGE Computer Science department Lecture 5: Inheritance & Polymorphism Lecture Contents 2 What is Inheritance? Super-class & sub class Protected members Creating subclasses

More information

CS313D: ADVANCED PROGRAMMING LANGUAGE

CS313D: ADVANCED PROGRAMMING LANGUAGE CS313D: ADVANCED PROGRAMMING LANGUAGE Computer Science department Lecture 4(b): Inheritance & Polymorphism Lecture Contents What is Inheritance? Super-class & sub class The object class Using extends keyword

More information

CS111: PROGRAMMING LANGUAGE II

CS111: PROGRAMMING LANGUAGE II 1 CS111: PROGRAMMING LANGUAGE II Computer Science Department Lecture 4(b): Subclasses and Superclasses OOP OOP - Inheritance Inheritance represents the is a relationship between data types (e.g. student/person)

More information

CS111: PROGRAMMING LANGUAGE II

CS111: PROGRAMMING LANGUAGE II CS111: PROGRAMMING LANGUAGE II Computer Science Department Lecture 4&5: Inheritance Lecture Contents What is Inheritance? Super-class & sub class The object class Using extends keyword @override keyword

More information

CS111: PROGRAMMING LANGUAGE II

CS111: PROGRAMMING LANGUAGE II 1 CS111: PROGRAMMING LANGUAGE II Computer Science Department Lecture 8(a): Abstract Classes Lecture Contents 2 Abstract base classes Concrete classes Dr. Amal Khalifa, 2014 Abstract Classes and Methods

More information

Assoc. Prof. Marenglen Biba. (C) 2010 Pearson Education, Inc. All rights reserved.

Assoc. Prof. Marenglen Biba. (C) 2010 Pearson Education, Inc. All rights reserved. Assoc. Prof. Marenglen Biba (C) 2010 Pearson Education, Inc. All Inheritance A form of software reuse in which a new class is created by absorbing an existing class s members and enriching them with

More information

BBM 102 Introduction to Programming II Spring Inheritance

BBM 102 Introduction to Programming II Spring Inheritance BBM 102 Introduction to Programming II Spring 2018 Inheritance 1 Today Inheritance Notion of subclasses and superclasses protected members UML Class Diagrams for inheritance 2 Inheritance A form of software

More information

Object Oriented Design

Object Oriented Design Object Oriented Design Chapter 12 continue 12.6 Case Study: Payroll System Using Polymorphism This section reexamines the CommissionEmployee- BasePlusCommissionEmployee hierarchy that we explored throughout

More information

CS313D: ADVANCED PROGRAMMING LANGUAGE

CS313D: ADVANCED PROGRAMMING LANGUAGE CS313D: ADVANCED PROGRAMMING LANGUAGE Computer Science department Lecture 6 : Abstraction Lecture Contents 2 Abstract classes Abstract methods Case study: Polymorphic processing Sealed methods & classes

More information

Chapter 5 Object-Oriented Programming

Chapter 5 Object-Oriented Programming Chapter 5 Object-Oriented Programming Develop code that implements tight encapsulation, loose coupling, and high cohesion Develop code that demonstrates the use of polymorphism Develop code that declares

More information

Java How to Program, 8/e

Java How to Program, 8/e Java How to Program, 8/e Polymorphism Enables you to program in the general rather than program in the specific. Polymorphism enables you to write programs that process objects that share the same superclass

More information

CS111: PROGRAMMING LANGUAGE II

CS111: PROGRAMMING LANGUAGE II 1 CS111: PROGRAMMING LANGUAGE II Computer Science Department Lecture 8(b): Abstract classes & Polymorphism Lecture Contents 2 Abstract base classes Concrete classes Polymorphic processing Dr. Amal Khalifa,

More information

Cpt S 122 Data Structures. Inheritance

Cpt S 122 Data Structures. Inheritance Cpt S 122 Data Structures Inheritance Nirmalya Roy School of Electrical Engineering and Computer Science Washington State University Topics Introduction Base Classes & Derived Classes Relationship between

More information

Inheritance and Polymorphism

Inheritance and Polymorphism Object Oriented Programming Designed and Presented by Dr. Ayman Elshenawy Elsefy Dept. of Systems & Computer Eng.. Al-Azhar University Website: eaymanelshenawy.wordpress.com Email : eaymanelshenawy@azhar.edu.eg

More information

Inheritance Introduction. 9.1 Introduction 361

Inheritance Introduction. 9.1 Introduction 361 www.thestudycampus.com Inheritance 9.1 Introduction 9.2 Superclasses and Subclasses 9.3 protected Members 9.4 Relationship Between Superclasses and Subclasses 9.4.1 Creating and Using a CommissionEmployee

More information

PROGRAMMING LANGUAGE 2

PROGRAMMING LANGUAGE 2 31/10/2013 Ebtsam Abd elhakam 1 PROGRAMMING LANGUAGE 2 Java lecture (7) Inheritance 31/10/2013 Ebtsam Abd elhakam 2 Inheritance Inheritance is one of the cornerstones of object-oriented programming. It

More information

Object Oriented Programming. Java-Lecture 11 Polymorphism

Object Oriented Programming. Java-Lecture 11 Polymorphism Object Oriented Programming Java-Lecture 11 Polymorphism Abstract Classes and Methods There will be a situation where you want to develop a design of a class which is common to many classes. Abstract class

More information

Inheritance -- Introduction

Inheritance -- Introduction Inheritance -- Introduction Another fundamental object-oriented technique is called inheritance, which, when used correctly, supports reuse and enhances software designs Chapter 8 focuses on: the concept

More information

Java Object Oriented Design. CSC207 Fall 2014

Java Object Oriented Design. CSC207 Fall 2014 Java Object Oriented Design CSC207 Fall 2014 Design Problem Design an application where the user can draw different shapes Lines Circles Rectangles Just high level design, don t write any detailed code

More information

Object-Oriented Programming: Polymorphism

Object-Oriented Programming: Polymorphism Object-Oriented Programming: Polymorphism By Harvey M. Deitel and Paul J. Deitel Jun 1, 2009 Sample Chapter is provided courtesy of Prentice Hall 10.1 Introduction We now continue our study of object-oriented

More information

OVERRIDING. 7/11/2015 Budditha Hettige 82

OVERRIDING. 7/11/2015 Budditha Hettige 82 OVERRIDING 7/11/2015 (budditha@yahoo.com) 82 What is Overriding Is a language feature Allows a subclass or child class to provide a specific implementation of a method that is already provided by one of

More information

Inheritance. Benefits of Java s Inheritance. 1. Reusability of code 2. Code Sharing 3. Consistency in using an interface. Classes

Inheritance. Benefits of Java s Inheritance. 1. Reusability of code 2. Code Sharing 3. Consistency in using an interface. Classes Inheritance Inheritance is the mechanism of deriving new class from old one, old class is knows as superclass and new class is known as subclass. The subclass inherits all of its instances variables and

More information

Java Programming Lecture 7

Java Programming Lecture 7 Java Programming Lecture 7 Alice E. Fischer Feb 16, 2015 Java Programming - L7... 1/16 Class Derivation Interfaces Examples Java Programming - L7... 2/16 Purpose of Derivation Class derivation is used

More information

Chapter 7. Inheritance

Chapter 7. Inheritance Chapter 7 Inheritance Introduction to Inheritance Inheritance is one of the main techniques of objectoriented programming (OOP) Using this technique, a very general form of a class is first defined and

More information

Lecture 18 CSE11 Fall 2013 Inheritance

Lecture 18 CSE11 Fall 2013 Inheritance Lecture 18 CSE11 Fall 2013 Inheritance What is Inheritance? Inheritance allows a software developer to derive a new class from an existing one write code once, use many times (code reuse) Specialization

More information

Inheritance (IS A Relationship)

Inheritance (IS A Relationship) Inheritance (IS A Relationship) We've talked about the basic idea of inheritance before, but we haven't yet seen how to implement it. Inheritance encapsulates the IS A Relationship. A String IS A Object.

More information

Programming II (CS300)

Programming II (CS300) 1 Programming II (CS300) Chapter 05: Inheritance and Interfaces MOUNA KACEM mouna@cs.wisc.edu Fall 2018 Inheritance and Interfaces 2 Introduction Inheritance and Class Hierarchy Polymorphism Abstract Classes

More information

Object Oriented Features. Inheritance. Inheritance. CS257 Computer Science I Kevin Sahr, PhD. Lecture 10: Inheritance

Object Oriented Features. Inheritance. Inheritance. CS257 Computer Science I Kevin Sahr, PhD. Lecture 10: Inheritance CS257 Computer Science I Kevin Sahr, PhD Lecture 10: Inheritance 1 Object Oriented Features For a programming language to be called object oriented it should support the following features: 1. objects:

More information

What is Inheritance?

What is Inheritance? Inheritance 1 Agenda What is and Why Inheritance? How to derive a sub-class? Object class Constructor calling chain super keyword Overriding methods (most important) Hiding methods Hiding fields Type casting

More information

Inheritance. Inheritance Reserved word protected Reserved word super Overriding methods Class Hierarchies Reading for this lecture: L&L

Inheritance. Inheritance Reserved word protected Reserved word super Overriding methods Class Hierarchies Reading for this lecture: L&L Inheritance Inheritance Reserved word protected Reserved word super Overriding methods Class Hierarchies Reading for this lecture: L&L 9.1 9.4 1 Inheritance Inheritance allows a software developer to derive

More information

Polymorphism 2/12/2018. Which statement is correct about overriding private methods in the super class?

Polymorphism 2/12/2018. Which statement is correct about overriding private methods in the super class? Which statement is correct about overriding private methods in the super class? Peer Instruction Polymorphism Please select the single correct answer. A. Any derived class can override private methods

More information

Lecture 5: Inheritance

Lecture 5: Inheritance McGill University Computer Science Department COMP 322 : Introduction to C++ Winter 2009 Lecture 5: Inheritance Sami Zhioua March 11 th, 2009 1 Inheritance Inheritance is a form of software reusability

More information

C++ Polymorphism. Systems Programming

C++ Polymorphism. Systems Programming C++ Polymorphism Systems Programming C++ Polymorphism Polymorphism Examples Relationships Among Objects in an Inheritance Hierarchy Invoking Base-Class Functions from Derived-Class Objects Aiming Derived-Class

More information

Computer Programming Inheritance 10 th Lecture

Computer Programming Inheritance 10 th Lecture Computer Programming Inheritance 10 th Lecture 엄현상 (Eom, Hyeonsang) School of Computer Science and Engineering Seoul National University Copyrights 2015 Eom, Hyeonsang All Rights Reserved 순서 Inheritance

More information

Polymorphism and Inheritance

Polymorphism and Inheritance Walter Savitch Frank M. Carrano Polymorphism and Inheritance Chapter 8 Objectives Describe polymorphism and inheritance in general Define interfaces to specify methods Describe dynamic binding Define and

More information

Comp 249 Programming Methodology

Comp 249 Programming Methodology Comp 249 Programming Methodology Chapter 7 - Inheritance Part A Dr. Aiman Hanna Department of Computer Science & Software Engineering Concordia University, Montreal, Canada These slides has been extracted,

More information

Programming II (CS300)

Programming II (CS300) 1 Programming II (CS300) Chapter 05: Inheritance and Interfaces MOUNA KACEM mouna@cs.wisc.edu Spring 2018 Inheritance and Interfaces 2 Introduction Inheritance and Class Hierarchy Polymorphism Abstract

More information

WEEK 13 EXAMPLES: POLYMORPHISM

WEEK 13 EXAMPLES: POLYMORPHISM WEEK 13 EXAMPLES: POLYMORPHISM CASE STUDY: PAYROLL SYSTEM USING POLYMORPHISM Use the principles of inheritance, abstract class, abstract method, and polymorphism to design a payroll project for a car lot.

More information

9/10/2018 Programming Data Structures Inheritance

9/10/2018 Programming Data Structures Inheritance 9/10/2018 Programming Data Structures Inheritance 1 Email me if the office door is closed 2 Introduction to Arrays An array is a data structure used to process a collection of data that is all of the same

More information

Inheritance and Polymorphism

Inheritance and Polymorphism Inheritance and Polymorphism Inheritance (Continued) Polymorphism Polymorphism by inheritance Polymorphism by interfaces Reading for this lecture: L&L 10.1 10.3 1 Interface Hierarchies Inheritance can

More information

What are the characteristics of Object Oriented programming language?

What are the characteristics of Object Oriented programming language? What are the various elements of OOP? Following are the various elements of OOP:- Class:- A class is a collection of data and the various operations that can be performed on that data. Object- This is

More information

final Methods and Classes

final Methods and Classes 1 2 OBJECTIVES In this chapter you will learn: The concept of polymorphism. To use overridden methods to effect polymorphism. To distinguish between abstract and concrete classes. To declare abstract methods

More information

CLASSES AND OBJECTS IN JAVA

CLASSES AND OBJECTS IN JAVA Lesson 8 CLASSES AND OBJECTS IN JAVA (1) Which of the following defines attributes and methods? (a) Class (b) Object (c) Function (d) Variable (2) Which of the following keyword is used to declare Class

More information

Inheritance, Polymorphism, and Interfaces

Inheritance, Polymorphism, and Interfaces Inheritance, Polymorphism, and Interfaces Chapter 8 Inheritance Basics (ch.8 idea) Inheritance allows programmer to define a general superclass with certain properties (methods, fields/member variables)

More information

Chapter 14 Abstract Classes and Interfaces

Chapter 14 Abstract Classes and Interfaces Chapter 14 Abstract Classes and Interfaces 1 What is abstract class? Abstract class is just like other class, but it marks with abstract keyword. In abstract class, methods that we want to be overridden

More information

Object-Oriented Concepts

Object-Oriented Concepts JAC444 - Lecture 3 Object-Oriented Concepts Segment 2 Inheritance 1 Classes Segment 2 Inheritance In this segment you will be learning about: Inheritance Overriding Final Methods and Classes Implementing

More information

CMSC 132: Object-Oriented Programming II

CMSC 132: Object-Oriented Programming II CMSC 132: Object-Oriented Programming II Java Support for OOP Department of Computer Science University of Maryland, College Park Object Oriented Programming (OOP) OO Principles Abstraction Encapsulation

More information

ECE 122. Engineering Problem Solving with Java

ECE 122. Engineering Problem Solving with Java ECE 122 Engineering Problem Solving with Java Lecture 17 Inheritance Overview Problem: Can we create bigger classes from smaller ones without having to repeat information? Subclasses: a class inherits

More information

Object-Oriented Programming

Object-Oriented Programming iuliana@cs.ubbcluj.ro Babes-Bolyai University 2018 1 / 40 Overview 1 2 3 4 5 2 / 40 Primary OOP features ion: separating an object s specification from its implementation. Encapsulation: grouping related

More information

Practice for Chapter 11

Practice for Chapter 11 Practice for Chapter 11 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Object-oriented programming allows you to derive new classes from existing

More information

Object Oriented Programming is a programming method that combines: Advantage of Object Oriented Programming

Object Oriented Programming is a programming method that combines: Advantage of Object Oriented Programming Overview of OOP Object Oriented Programming is a programming method that combines: a) Data b) Instructions for processing that data into a self-sufficient object that can be used within a program or in

More information

CS-202 Introduction to Object Oriented Programming

CS-202 Introduction to Object Oriented Programming CS-202 Introduction to Object Oriented Programming California State University, Los Angeles Computer Science Department Lecture III Inheritance and Polymorphism Introduction to Inheritance Introduction

More information

INHERITANCE & POLYMORPHISM. INTRODUCTION IB DP Computer science Standard Level ICS3U. INTRODUCTION IB DP Computer science Standard Level ICS3U

INHERITANCE & POLYMORPHISM. INTRODUCTION IB DP Computer science Standard Level ICS3U. INTRODUCTION IB DP Computer science Standard Level ICS3U C A N A D I A N I N T E R N A T I O N A L S C H O O L O F H O N G K O N G INHERITANCE & POLYMORPHISM P2 LESSON 12 P2 LESSON 12.1 INTRODUCTION inheritance: OOP allows a programmer to define new classes

More information

Contents. I. Classes, Superclasses, and Subclasses. Topic 04 - Inheritance

Contents. I. Classes, Superclasses, and Subclasses. Topic 04 - Inheritance Contents Topic 04 - Inheritance I. Classes, Superclasses, and Subclasses - Inheritance Hierarchies Controlling Access to Members (public, no modifier, private, protected) Calling constructors of superclass

More information

Pieter van den Hombergh Thijs Dorssers Stefan Sobek. February 10, 2017

Pieter van den Hombergh Thijs Dorssers Stefan Sobek. February 10, 2017 Inheritance and Inheritance and Pieter van den Hombergh Thijs Dorssers Stefan Sobek Fontys Hogeschool voor Techniek en Logistiek February 10, 2017 /FHTenL Inheritance and February 10, 2017 1/45 Topics

More information

JAVA MOCK TEST JAVA MOCK TEST II

JAVA MOCK TEST JAVA MOCK TEST II http://www.tutorialspoint.com JAVA MOCK TEST Copyright tutorialspoint.com This section presents you various set of Mock Tests related to Java Framework. You can download these sample mock tests at your

More information

OOPS Viva Questions. Object is termed as an instance of a class, and it has its own state, behavior and identity.

OOPS Viva Questions. Object is termed as an instance of a class, and it has its own state, behavior and identity. OOPS Viva Questions 1. What is OOPS? OOPS is abbreviated as Object Oriented Programming system in which programs are considered as a collection of objects. Each object is nothing but an instance of a class.

More information

Arrays Classes & Methods, Inheritance

Arrays Classes & Methods, Inheritance Course Name: Advanced Java Lecture 4 Topics to be covered Arrays Classes & Methods, Inheritance INTRODUCTION TO ARRAYS The following variable declarations each allocate enough storage to hold one value

More information

Inheritance. Lecture 11 COP 3252 Summer May 25, 2017

Inheritance. Lecture 11 COP 3252 Summer May 25, 2017 Inheritance Lecture 11 COP 3252 Summer 2017 May 25, 2017 Subclasses and Superclasses Inheritance is a technique that allows one class to be derived from another. A derived class inherits all of the data

More information

Object-Oriented Programming (OOP) Fundamental Principles of OOP

Object-Oriented Programming (OOP) Fundamental Principles of OOP Object-Oriented Programming (OOP) O b j e c t O r i e n t e d P r o g r a m m i n g 1 Object-oriented programming is the successor of procedural programming. The problem with procedural programming is

More information

9/21/2010. Based on Chapter 2 in Advanced Programming Using Visual Basic.NET by Bradley and Millspaugh

9/21/2010. Based on Chapter 2 in Advanced Programming Using Visual Basic.NET by Bradley and Millspaugh Building Multitier Programs with Classes Based on Chapter 2 in Advanced Programming Using Visual Basic.NET by Bradley and Millspaugh The Object-Oriented Oriented (OOP) Development Approach Large production

More information

Chapter 10 Classes Continued. Fundamentals of Java

Chapter 10 Classes Continued. Fundamentals of Java Chapter 10 Classes Continued Objectives Know when it is appropriate to include class (static) variables and methods in a class. Understand the role of Java interfaces in a software system and define an

More information

Object-Oriented Programming: Polymorphism Pearson Education, Inc. All rights reserved.

Object-Oriented Programming: Polymorphism Pearson Education, Inc. All rights reserved. 1 10 Object-Oriented Programming: Polymorphism 2 A Motivating Example Employee as an abstract superclass. Lots of different types of employees (well, 4). Executing the same code on all different types

More information

Overview of OOP. Dr. Zhang COSC 1436 Summer, /18/2017

Overview of OOP. Dr. Zhang COSC 1436 Summer, /18/2017 Overview of OOP Dr. Zhang COSC 1436 Summer, 2017 7/18/2017 Review Data Structures (list, dictionary, tuples, sets, strings) Lists are enclosed in square brackets: l = [1, 2, "a"] (access by index, is mutable

More information

More On inheritance. What you can do in subclass regarding methods:

More On inheritance. What you can do in subclass regarding methods: More On inheritance What you can do in subclass regarding methods: The inherited methods can be used directly as they are. You can write a new static method in the subclass that has the same signature

More information

8. Polymorphism and Inheritance

8. Polymorphism and Inheritance 8. Polymorphism and Inheritance Harald Gall, Prof. Dr. Institut für Informatik Universität Zürich http://seal.ifi.uzh.ch/info1 Objectives Describe polymorphism and inheritance in general Define interfaces

More information

Inheritance (Part 5) Odds and ends

Inheritance (Part 5) Odds and ends Inheritance (Part 5) Odds and ends 1 Static Methods and Inheritance there is a significant difference between calling a static method and calling a non-static method when dealing with inheritance there

More information

INHERITANCE AND EXTENDING CLASSES

INHERITANCE AND EXTENDING CLASSES INHERITANCE AND EXTENDING CLASSES Java programmers often take advantage of a feature of object-oriented programming called inheritance, which allows programmers to make one class an extension of another

More information

Name Return type Argument list. Then the new method is said to override the old one. So, what is the objective of subclass?

Name Return type Argument list. Then the new method is said to override the old one. So, what is the objective of subclass? 1. Overriding Methods A subclass can modify behavior inherited from a parent class. A subclass can create a method with different functionality than the parent s method but with the same: Name Return type

More information

Programming Language Concepts Object-Oriented Programming. Janyl Jumadinova 28 February, 2017

Programming Language Concepts Object-Oriented Programming. Janyl Jumadinova 28 February, 2017 Programming Language Concepts Object-Oriented Programming Janyl Jumadinova 28 February, 2017 Three Properties of Object-Oriented Languages: Encapsulation Inheritance Dynamic method binding (polymorphism)

More information

HAS-A Relationship. If A uses B, then it is an aggregation, stating that B exists independently from A.

HAS-A Relationship. If A uses B, then it is an aggregation, stating that B exists independently from A. HAS-A Relationship Association is a weak relationship where all objects have their own lifetime and there is no ownership. For example, teacher student; doctor patient. If A uses B, then it is an aggregation,

More information

C++ Important Questions with Answers

C++ Important Questions with Answers 1. Name the operators that cannot be overloaded. sizeof,.,.*,.->, ::,? 2. What is inheritance? Inheritance is property such that a parent (or super) class passes the characteristics of itself to children

More information

Pieter van den Hombergh Thijs Dorssers Stefan Sobek. January 11, 2018

Pieter van den Hombergh Thijs Dorssers Stefan Sobek. January 11, 2018 Inheritance and Inheritance and Pieter van den Hombergh Thijs Dorssers Stefan Sobek Java Inheritance Example I Visibility peekabo Constructors Fontys Hogeschool voor Techniek en Logistiek January 11, 2018

More information

OBJECT ORIENTED PROGRAMMING USING C++ CSCI Object Oriented Analysis and Design By Manali Torpe

OBJECT ORIENTED PROGRAMMING USING C++ CSCI Object Oriented Analysis and Design By Manali Torpe OBJECT ORIENTED PROGRAMMING USING C++ CSCI 5448- Object Oriented Analysis and Design By Manali Torpe Fundamentals of OOP Class Object Encapsulation Abstraction Inheritance Polymorphism Reusability C++

More information

CREATED BY: Muhammad Bilal Arslan Ahmad Shaad. JAVA Chapter No 5. Instructor: Muhammad Naveed

CREATED BY: Muhammad Bilal Arslan Ahmad Shaad. JAVA Chapter No 5. Instructor: Muhammad Naveed CREATED BY: Muhammad Bilal Arslan Ahmad Shaad JAVA Chapter No 5 Instructor: Muhammad Naveed Muhammad Bilal Arslan Ahmad Shaad Chapter No 5 Object Oriented Programming Q: Explain subclass and inheritance?

More information

CSSE 220 Day 15. Inheritance. Check out DiscountSubclasses from SVN

CSSE 220 Day 15. Inheritance. Check out DiscountSubclasses from SVN CSSE 220 Day 15 Inheritance Check out DiscountSubclasses from SVN Discount Subclasses Work in pairs First look at my solution and understand how it works Then draw a UML diagram of it DiscountSubclasses

More information

[ L5P1] Object-Oriented Programming: Advanced Concepts

[ L5P1] Object-Oriented Programming: Advanced Concepts [ L5P1] Object-Oriented Programming: Advanced Concepts Polymorphism Polymorphism is an important and useful concept in the object-oriented paradigm. Take the example of writing a payroll application for

More information

HAS-A Relationship. Association is a relationship where all objects have their own lifecycle and there is no owner.

HAS-A Relationship. Association is a relationship where all objects have their own lifecycle and there is no owner. HAS-A Relationship Association is a relationship where all objects have their own lifecycle and there is no owner. For example, teacher student Aggregation is a specialized form of association where all

More information

Chapter 12. OOP: Creating Object-Oriented Programs The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill

Chapter 12. OOP: Creating Object-Oriented Programs The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill Chapter 12 OOP: Creating Object-Oriented Programs McGraw-Hill 2010 The McGraw-Hill Companies, Inc. All rights reserved. Chapter Objectives - 1 Use object-oriented terminology correctly Create a two-tier

More information

Lecture 4: Extending Classes. Concept

Lecture 4: Extending Classes. Concept Lecture 4: Extending Classes Concept Inheritance: you can create new classes that are built on existing classes. Through the way of inheritance, you can reuse the existing class s methods and fields, and

More information

Inheritance. Unit 8. Summary. 8.1 Inheritance. 8.2 Inheritance: example. Inheritance Overriding of methods and polymorphism The class Object

Inheritance. Unit 8. Summary. 8.1 Inheritance. 8.2 Inheritance: example. Inheritance Overriding of methods and polymorphism The class Object Unit 8 Inheritance Summary Inheritance Overriding of methods and polymorphism The class Object 8.1 Inheritance Inheritance in object-oriented languages consists in the possibility of defining a class that

More information

CS 251 Intermediate Programming Inheritance

CS 251 Intermediate Programming Inheritance CS 251 Intermediate Programming Inheritance Brooke Chenoweth University of New Mexico Spring 2018 Inheritance We don t inherit the earth from our parents, We only borrow it from our children. What is inheritance?

More information

Microsoft Visual Basic 2005: Reloaded

Microsoft Visual Basic 2005: Reloaded Microsoft Visual Basic 2005: Reloaded Second Edition Chapter 10 Creating Classes and Objects Objectives After studying this chapter, you should be able to: Define a class Instantiate an object from a class

More information

CS5000: Foundations of Programming. Mingon Kang, PhD Computer Science, Kennesaw State University

CS5000: Foundations of Programming. Mingon Kang, PhD Computer Science, Kennesaw State University CS5000: Foundations of Programming Mingon Kang, PhD Computer Science, Kennesaw State University Inheritance Three main programming mechanisms that constitute object-oriented programming (OOP) Encapsulation

More information

Graphical Interface and Application (I3305) Semester: 1 Academic Year: 2017/2018 Dr Antoun Yaacoub

Graphical Interface and Application (I3305) Semester: 1 Academic Year: 2017/2018 Dr Antoun Yaacoub Lebanese University Faculty of Science Computer Science BS Degree Graphical Interface and Application (I3305) Semester: 1 Academic Year: 2017/2018 Dr Antoun Yaacoub 2 Crash Course in JAVA Classes A Java

More information

Abstract Classes. Abstract Classes a and Interfaces. Class Shape Hierarchy. Problem AND Requirements. Abstract Classes.

Abstract Classes. Abstract Classes a and Interfaces. Class Shape Hierarchy. Problem AND Requirements. Abstract Classes. a and Interfaces Class Shape Hierarchy Consider the following class hierarchy Shape Circle Square Problem AND Requirements Suppose that in order to exploit polymorphism, we specify that 2-D objects must

More information

Data Structures (list, dictionary, tuples, sets, strings)

Data Structures (list, dictionary, tuples, sets, strings) Data Structures (list, dictionary, tuples, sets, strings) Lists are enclosed in brackets: l = [1, 2, "a"] (access by index, is mutable sequence) Tuples are enclosed in parentheses: t = (1, 2, "a") (access

More information

More on Objects in JAVA TM

More on Objects in JAVA TM More on Objects in JAVA TM Inheritance : Definition: A subclass is a class that extends another class. A subclass inherits state and behavior from all of its ancestors. The term superclass refers to a

More information

CLASS DESIGN. Objectives MODULE 4

CLASS DESIGN. Objectives MODULE 4 MODULE 4 CLASS DESIGN Objectives > After completing this lesson, you should be able to do the following: Use access levels: private, protected, default, and public. Override methods Overload constructors

More information

More About Objects. Zheng-Liang Lu Java Programming 255 / 282

More About Objects. Zheng-Liang Lu Java Programming 255 / 282 More About Objects Inheritance: passing down states and behaviors from the parents to their children. Interfaces: requiring objects for the demanding methods which are exposed to the outside world. Polymorphism

More information

Exercise: Singleton 1

Exercise: Singleton 1 Exercise: Singleton 1 In some situations, you may create the only instance of the class. 1 class mysingleton { 2 3 // Will be ready as soon as the class is loaded. 4 private static mysingleton Instance

More information

Advanced Programming Using Visual Basic 2008

Advanced Programming Using Visual Basic 2008 Building Multitier Programs with Classes Advanced Programming Using Visual Basic 2008 The OOP Development Approach OOP = Object Oriented Programming Large production projects are created by teams Each

More information

ITI Introduction to Computing II

ITI Introduction to Computing II ITI 1121. Introduction to Computing II Marcel Turcotte School of Electrical Engineering and Computer Science Inheritance Introduction Generalization/specialization Version of January 20, 2014 Abstract

More information

Subclassing, con.nued Method overriding, virtual methods, abstract classes/methods. COMP 401, Spring 2015 Lecture 9 2/19/2015

Subclassing, con.nued Method overriding, virtual methods, abstract classes/methods. COMP 401, Spring 2015 Lecture 9 2/19/2015 Subclassing, con.nued Method overriding, virtual methods, abstract classes/methods COMP 401, Spring 2015 Lecture 9 2/19/2015 Subclassing So Far A subclass inherits implementa.on details from its superclass

More information

Programming Exercise 14: Inheritance and Polymorphism

Programming Exercise 14: Inheritance and Polymorphism Programming Exercise 14: Inheritance and Polymorphism Purpose: Gain experience in extending a base class and overriding some of its methods. Background readings from textbook: Liang, Sections 11.1-11.5.

More information

CS260 Intro to Java & Android 03.Java Language Basics

CS260 Intro to Java & Android 03.Java Language Basics 03.Java Language Basics http://www.tutorialspoint.com/java/index.htm CS260 - Intro to Java & Android 1 What is the distinction between fields and variables? Java has the following kinds of variables: Instance

More information

IT101. Inheritance, Encapsulation, Polymorphism and Constructors

IT101. Inheritance, Encapsulation, Polymorphism and Constructors IT101 Inheritance, Encapsulation, Polymorphism and Constructors OOP Advantages and Concepts What are OOP s claims to fame? Better suited for team development Facilitates utilizing and creating reusable

More information

CIS 110: Introduction to computer programming

CIS 110: Introduction to computer programming CIS 110: Introduction to computer programming Lecture 25 Inheritance and polymorphism ( 9) 12/3/2011 CIS 110 (11fa) - University of Pennsylvania 1 Outline Inheritance Polymorphism Interfaces 12/3/2011

More information

Inheritance. Transitivity

Inheritance. Transitivity Inheritance Classes can be organized in a hierarchical structure based on the concept of inheritance Inheritance The property that instances of a sub-class can access both data and behavior associated

More information

Computer Science 2 Lecture 4 Inheritance: Trinidad Fruit Stand 02/15/2014 Revision : 1.7

Computer Science 2 Lecture 4 Inheritance: Trinidad Fruit Stand 02/15/2014 Revision : 1.7 Computer Science 2 Lecture 4 Inheritance: Trinidad Fruit Stand 02/15/2014 Revision : 1.7 1 Problem Ralph owns the Trinidad Fruit Stand that sells its fruit on the street, and he wants to use a computer

More information