Abstract Class. Lecture 21. Based on Slides of Dr. Norazah Yusof
|
|
- Christian Alexander
- 6 years ago
- Views:
Transcription
1 Abstract Class Lecture 21 Based on Slides of Dr. Norazah Yusof 1
2 Abstract Class Abstract class is a class with one or more abstract methods. The abstract method Method signature without implementation An abstract class must have a modifier abstract included in the class heading. The abstract class Cannot be instantiated Should be extended and implemented in subclasses 2
3 From Chapter 9 GeometricObject -color: String -filled: boolean -datecreated: java.util.date +GeometricObject() +getcolor(): String +setcolor(color: String): void +isfilled(): boolean +setfilled(filled: boolean): void +getdatecreated(): java.util.date +tostring(): String The color of the object (default: white). Indicates whether the object is filled with a color (default: false). The date when the object was created. Creates a GeometricObject. Returns the color. Sets a new color. Returns the filled property. Sets a new filled property. Returns the datecreated. Returns a string representation of this object. Circle -radius: double +Circle() +Circle(radius: double) +getradius(): double +setradius(radius: double): void +getarea(): double +getperimeter(): double +getdiameter(): double Rectangle -width: double -height: double +Rectangle() +Rectangle(width: double, height: double) +getwidth(): double +setwidth(width: double): void +getheight(): double +setheight(height: double): void +getarea(): double +getperimeter(): double 3
4 Abstract Classes The # sign indicates protected modifer GeometricObject -color: String -filled: boolean -datecreated: java.util.date #GeometricObject() +getcolor(): String +setcolor(color: String): void +isfilled(): boolean +setfilled(filled: boolean): void +getdatecreated(): java.util.date +tostring(): String +getarea(): double +getperimeter(): double Circle -radius: double +Circle() +Circle(radius: double) +getradius(): double +setradius(radius: double): void +getdiameter(): double Rectangle -width: double -height: double +Rectangle() +Rectangle(width: double, height: double) +getwidth(): double +setwidth(width: double): void +getheight(): double +setheight(height: double): void 4
5 Abstract Class public abstract class GeometricObject{ private String color ="white"; private boolean filled; private java.util.date datecreated; protected GeometricObject(){ datecreated = new java.util.date(); : public abstract double getarea(); public abstract double getperimeter(); 5
6 Abstract Class public class Circle extends GeometricObject { private double radius; : : public double getarea() { return radius * radius * Math.PI; public double getperimeter() { return 2 * radius * Math.PI; 6
7 Abstract Class public class Rectangle extends GeometricObject { private double radius; : : public double getarea() { return width * height; public double getperimeter() { return 2*(width + height); 7
8 NOTE An abstract method cannot be contained in a non-abstract class. If a subclass of an abstract superclass does not implement all the abstract methods, the subclass must be declared abstract. In other words, if a non-abstract subclass extended from an abstract class, all the abstract methods must be implemented, even if they are not used in the subclass. 8
9 NOTE An abstract class cannot be instantiated using the new operator, but you can still define its constructors, which are invoked in the constructors of its subclasses. For instance, the constructors of GeometricObject are invoked in the Circle class and the Rectangle class. 9
10 NOTE A subclass can be abstract even if its superclass is concrete. For example, the Object class is concrete, but its subclasses, such as GeometricObject, may be abstract. 10
11 NOTE You cannot create an instance from an abstract class using the new operator, but an abstract class can be used as a data type. Therefore, the following statement, which creates an array whose elements are of GeometricObject type, is correct. GeometricObject[] geo = new GeometricObject[10]; 12
Object Oriented System Development Paradigm. Sunnie Chung CIS433 System Analysis Methods
Object Oriented System Development Paradigm Sunnie Chung CIS433 System Analysis Methods OO Programming Concepts Object-oriented programming (OOP) involves programming using objects. An object represents
More informationCS1150 Principles of Computer Science Objects and Classes
CS1150 Principles of Computer Science Objects and Classes Yanyan Zhuang Department of Computer Science http://www.cs.uccs.edu/~yzhuang CS1150 UC. Colorado Springs Object-Oriented Thinking Chapters 1-8
More informationCISC 3115 TY3. C09a: Inheritance. Hui Chen Department of Computer & Information Science CUNY Brooklyn College. 9/20/2018 CUNY Brooklyn College
CISC 3115 TY3 C09a: Inheritance Hui Chen Department of Computer & Information Science CUNY Brooklyn College 9/20/2018 CUNY Brooklyn College 1 Outline Inheritance Superclass/supertype, subclass/subtype
More informationCS171:Introduction to Computer Science II. Li Xiong
CS171:Introduction to Computer Science II Simple Sorting (cont.) + Interface Li Xiong Today Simple sorting algorithms (cont.) Bubble sort Selection sort Insertion sort Interface Sorting problem Two useful
More informationIntroduction to OOP with Java. Instructor: AbuKhleif, Mohammad Noor Sep 2017
Introduction to OOP with Java Instructor: AbuKhleif, Mohammad Noor Sep 2017 Lecture 11: Inheritance and Polymorphism Part 1 Instructor: AbuKhleif, Mohammad Noor Sep 2017 Instructor AbuKhleif, Mohammad
More informationConstructor. Liang, Introduction to Java Programming, Tenth Edition, (c) 2013 Pearson Education, Inc. All rights reserved.
Constructor Suppose you will define classes to model circles, rectangles, and triangles. These classes have many common features. What is the best way to design these classes so to avoid redundancy? The
More informationChapter 10 Inheritance and Polymorphism. Dr. Hikmat Jaber
Chapter 10 Inheritance and Polymorphism Dr. Hikmat Jaber 1 Motivations Suppose you will define classes to model circles, rectangles, and triangles. These classes have many common features. What is the
More informationLecture Notes Chapter #9_c Abstract Classes & Interfaces
Lecture Notes Chapter #9_c Abstract Classes & Interfaces Abstract Classes parent class child class more abstract more concrete, i.e., less abstract abstract class o class with an abstract modifier o class
More informationWe are on the GUI fast track path
We are on the GUI fast track path Chapter 13: Exception Handling Skip for now Chapter 14: Abstract Classes and Interfaces Sections 1 9: ActionListener interface Chapter 15: Graphics Skip for now Chapter
More informationLecture Notes Chapter #9_b Inheritance & Polymorphism
Lecture Notes Chapter #9_b Inheritance & Polymorphism Inheritance results from deriving new classes from existing classes Root Class all java classes are derived from the java.lang.object class GeometricObject1
More informationChapter 11 Inheritance and Polymorphism. Motivations. Suppose you will define classes to model circles,
Chapter 11 Inheritance and Polymorphism 1 Motivations Suppose you will define classes to model circles, rectangles, and triangles. These classes have many common features. What is the best way to design
More informationInheritance and Polymorphism
Inheritance and Polymorphism Dr. M. G. Abbas Malik Assistant Professor Faculty of Computing and IT (North Jeddah Branch) King Abdulaziz University, Jeddah, KSA mgmalik@kau.edu.sa www.sanlp.org/malik/cpit305/ap.html
More informationChapter 21- Using Generics Case Study: Geometric Bunch. Class: Driver. package csu.matos; import java.util.arraylist; public class Driver {
Chapter 21- Using Generics Case Study: Geometric Bunch In this example a class called GeometricBunch is made to wrap around a list of GeometricObjects. Circle and Rectangle are subclasses of GeometricObject.
More informationChapter 11 Object-Oriented Design Exception and binary I/O can be covered after Chapter 9
Chapter 6 Arrays Chapter 7 Objects and Classes Chapter 8 Strings Chapter 9 Inheritance and Polymorphism GUI can be covered after 10.2, Abstract Classes Chapter 12 GUI Basics 10.2, Abstract Classes Chapter
More informationInheritance and Polymorphism. CSE 114, Computer Science 1 Stony Brook University
Inheritance and Polymorphism CSE 114, Computer Science 1 Stony Brook University http://www.cs.stonybrook.edu/~cse114 1 Motivation Model classes with similar properties and methods: Circles, rectangles
More informationCS 112 Programming 2. Lecture 06. Inheritance & Polymorphism (1) Chapter 11 Inheritance and Polymorphism
CS 112 Programming 2 Lecture 06 Inheritance & Polymorphism (1) Chapter 11 Inheritance and Polymorphism rights reserved. 2 Motivation Suppose you want to define classes to model circles, rectangles, and
More informationChapter 11 Inheritance and Polymorphism
Chapter 11 Inheritance and Polymorphism 1 Motivations OOP is built on three principles: Encapsulation (classes/objects, discussed in chapters 9 and 10), Inheritance, and Polymorphism. Inheritance: Suppose
More informationChapter 11 Inheritance and Polymorphism
Chapter 11 Inheritance and Polymorphism Lecture notes for computer programming 1 Faculty of Engineering and Information Technology Prepared by: Iyad Albayouk 1 Motivations Suppose you will define classes
More informationChapter 11 Object-Oriented Design Exception and binary I/O can be covered after Chapter 9
Chapter 6 Arrays Chapter 8 Strings Chapter 7 Objects and Classes Chapter 9 Inheritance and Polymorphism GUI can be covered after 10.2, Abstract Classes Chapter 12 GUI Basics 10.2, Abstract Classes Chapter
More informationIntroduction Programming Using Python Lecture 8. Dr. Zhang COSC 1437 Fall 2017 Nov 30, 2017
Introduction Programming Using Python Lecture 8 Dr. Zhang COSC 1437 Fall 2017 Nov 30, 2017 Chapter 12 Inheritance and Class Design Review Suppose you will define classes to model circles, rectangles, and
More informationCOMP200 ABSTRACT CLASSES. OOP using Java, from slides by Shayan Javed
1 1 COMP200 ABSTRACT CLASSES OOP using Java, from slides by Shayan Javed Abstract Classes 2 3 From the previous lecture: public class GeometricObject { protected String Color; protected String name; protected
More information24. Inheritance. Java. Fall 2009 Instructor: Dr. Masoud Yaghini
24. Inheritance Java Fall 2009 Instructor: Dr. Masoud Yaghini Outline Superclasses and Subclasses Using the super Keyword Overriding Methods The Object Class References Superclasses and Subclasses Inheritance
More information22. Inheritance. Java. Summer 2008 Instructor: Dr. Masoud Yaghini
22. Inheritance Java Summer 2008 Instructor: Dr. Masoud Yaghini Outline Superclasses and Subclasses Using the super Keyword Overriding Methods The Object Class References Inheritance Object-oriented programming
More informationCOMP200 INHERITANCE. OOP using Java, from slides by Shayan Javed
1 1 COMP200 INHERITANCE OOP using Java, from slides by Shayan Javed 2 Inheritance Derive new classes (subclass) from existing ones (superclass). Only the Object class (java.lang) has no superclass Every
More informationChapter 11 Inheritance and Polymorphism
Chapter 11 Inheritance and Polymorphism rights reserved. 1 Motivations Suppose you will define classes to model circles, rectangles, and triangles. These classes have many common features. What is the
More informationIn this lab, you will be given the implementation of the classes GeometricObject, Circle, and Rectangle, as shown in the following UML class diagram.
Jordan University Faculty of Engineering and Technology Department of Computer Engineering Object-Oriented Problem Solving: CPE 342 Lab-8 Eng. Asma Abdel Karim In this lab, you will be given the implementation
More informationChapter 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 informationLesson11-Inheritance-Abstract-Classes. The GeometricObject case
Lesson11-Inheritance-Abstract-Classes The GeometricObject case GeometricObject class public abstract class GeometricObject private string color = "White"; private DateTime datecreated = new DateTime(2017,
More informationAbstract Classes Interfaces
Abstract Classes Interfaces Reading: Chapter 14 (skip 14.1,14.6, 14.12, and 14.13; read 14.7 lightly) Objectives 2 To design and use abstract classes ( 14.2-14.3). To specify common behavior for objects
More informationCOMP 250. inheritance (cont.) interfaces abstract classes
COMP 250 Lecture 31 inheritance (cont.) interfaces abstract classes Nov. 20, 2017 1 https//goo.gl/forms/ymqdaeilt7vxpnzs2 2 class Object boolean equals( Object ) int hashcode( ) String tostring( ) Object
More informationChapter 13 Abstract Classes and Interfaces
Chapter 13 Abstract Classes and Interfaces rights reserved. 1 Motivations You have learned how to write simple programs to create and display GUI components. Can you write the code to respond to user actions,
More information25. Generic Programming
25. Generic Programming Java Fall 2009 Instructor: Dr. Masoud Yaghini Generic Programming Outline Polymorphism and Generic Programming Casting Objects and the instanceof Operator The protected Data and
More informationInterface Class. Lecture 22. Based on Slides of Dr. Norazah Yusof
Interface Class Lecture 22 Based on Slides of Dr. Norazah Yusof 1 Interface & Implements An interface is a classlike construct that contains only constants variables and abstract methods definition. An
More informationInheritance (Deitel chapter 9)
Inheritance (Deitel chapter 9) 1 2 Plan Introduction Superclasses and Subclasses protected Members Constructors and Finalizers in Subclasses Software Engineering with Inheritance 3 Introduction Inheritance
More informationChapter 13 Abstract Classes and Interfaces
Chapter 13 Abstract Classes and Interfaces rights reserved. 1 Motivations You have learned how to write simple programs to create and display GUI components. Can you write the code to respond to user actions,
More informationJava Classes, Objects, Inheritance, Abstract and Interfaces Recap
Java Classes, Objects, Inheritance, Abstract and Interfaces Recap CSE260, Computer Science B: Honors Stony Brook University http://www.cs.stonybrook.edu/~cse260 1 Objectives To recap classes, objects,
More information1. Which of the following is the correct expression of character 4? a. 4 b. "4" c. '\0004' d. '4'
Practice questions: 1. Which of the following is the correct expression of character 4? a. 4 b. "4" c. '\0004' d. '4' 2. Will System.out.println((char)4) display 4? a. Yes b. No 3. The expression "Java
More informationChapter 6: Inheritance
Chapter 6: Inheritance EECS 1030 moodle.yorku.ca State of an object final int WIDTH = 3; final int HEIGTH = 4; final int WEIGHT = 80; GoldenRectangle rectangle = new GoldenRectangle(WIDTH, HEIGHT, WEIGHT);
More informationCS-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 informationCSE 8B Programming Assignments Spring Programming: You will have 5 files all should be located in a dir. named PA3:
PROGRAMMING ASSIGNMENT 3: Read Savitch: Chapter 7 Programming: You will have 5 files all should be located in a dir. named PA3: ShapeP3.java PointP3.java CircleP3.java RectangleP3.java TriangleP3.java
More informationGenerics. CSE260, Computer Science B: Honors Stony Brook University
Generics CSE260, Computer Science B: Honors Stony Brook University http://www.cs.stonybrook.edu/~cse260 1 2 Objectives To know the benefits of generics. To use generic classes and interfaces. To declare
More informationITI 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 informationChapter 9 - Object-Oriented Programming: Polymorphism
Chapter 9 - Object-Oriented Programming: Polymorphism Polymorphism Program in the general Introduction Treat objects in same class hierarchy as if all superclass Abstract class Common functionality Makes
More informationITI 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 21, 2013 Abstract
More informationChapter 9 Abstract Classes and Interfaces
Chapter 9 Abstract Classes and Interfaces Prerequisites for Part II Chapter 5 Arrays Chapter 6 Objects and Classes Chapter 7 Strings Chapter 8 Inheritance and Polymorphism You can cover GUI after Chapter
More informationProgramming 2. Inheritance & Polymorphism
Programming 2 Inheritance & Polymorphism Motivation Lame Shape Application public class LameShapeApplication { Rectangle[] therects=new Rectangle[100]; Circle[] thecircles=new Circle[100]; Triangle[] thetriangles=new
More informationJAVA PROGRAMMING LAB. ABSTRACT In this Lab you will learn how to describe objects and classes and how to define classes and create objects
Islamic University of Gaza Faculty of Engineering Computer Engineering Dept Computer Programming Lab (ECOM 2114) ABSTRACT In this Lab you will learn how to describe objects and classes and how to define
More informationAbstract Classes and Interfaces. CSE 114, Computer Science 1 Stony Brook University
Abstract Classes and Interfaces CSE 114, Computer Science 1 Stony Brook University http://www.cs.stonybrook.edu/~cse114 Abstract Classes and Abstract Methods The # sign indicates protected modifier Abstract
More informationChapter 13 Abstract Classes and Interfaces
Chapter 13 Abstract Classes and Interfaces 1 Abstract Classes Abstraction is to extract common behaviors/properties into a higher level in the class hierarch so that they are shared (implemented) by subclasses
More informationIST311. Advanced Issues in OOP: Inheritance and Polymorphism
IST311 Advanced Issues in OOP: Inheritance and Polymorphism IST311/602 Cleveland State University Prof. Victor Matos Adapted from: Introduction to Java Programming: Comprehensive Version, Eighth Edition
More informationCH. 2 OBJECT-ORIENTED PROGRAMMING
CH. 2 OBJECT-ORIENTED PROGRAMMING ACKNOWLEDGEMENT: THESE SLIDES ARE ADAPTED FROM SLIDES PROVIDED WITH DATA STRUCTURES AND ALGORITHMS IN JAVA, GOODRICH, TAMASSIA AND GOLDWASSER (WILEY 2016) OBJECT-ORIENTED
More informationObject Oriented Programming
Islamic University of Gaza Faculty of Engineering Computer Engineering Department Computer Programming Lab (ECOM 2114) Lab 11 Object Oriented Programming Eng. Mohammed Alokshiya December 16, 2014 Object-oriented
More informationOOP Part 2. Introduction to OOP with Java. Lecture 08: Introduction to OOP with Java - AKF Sep AbuKhleiF -
Introduction to OOP with Java Instructor: AbuKhleif, Mohammad Noor Sep 2017 Lecture 08: OOP Part 2 Instructor: AbuKhleif, Mohammad Noor Sep 2017 AbuKhleiF - 1 Instructor AbuKhleif, Mohammad Noor Computer
More informationindex.pdf January 21,
index.pdf January 21, 2013 1 ITI 1121. Introduction to Computing II Circle Let s complete the implementation of the class Circle. Marcel Turcotte School of Electrical Engineering and Computer Science Version
More informationOutline. Inheritance. Abstract Classes Interfaces. Class Extension Overriding Methods Inheritance and Constructors Polymorphism.
Outline Inheritance Class Extension Overriding Methods Inheritance and Constructors Polymorphism Abstract Classes Interfaces 1 OOP Principles Encapsulation Methods and data are combined in classes Not
More informationReusing Classes. Hendrik Speleers
Hendrik Speleers Overview Composition Inheritance Polymorphism Method overloading vs. overriding Visibility of variables and methods Specification of a contract Abstract classes, interfaces Software development
More informationITI Introduction to Computing II
ITI 1121. Introduction to Computing II Marcel Turcotte School of Electrical Engineering and Computer Science Inheritance (part II) Polymorphism Version of January 21, 2013 Abstract These lecture notes
More informationITI Introduction to Computing II
ITI 1121. Introduction to Computing II Marcel Turcotte School of Electrical Engineering and Computer Science Inheritance (part II) Polymorphism Version of January 21, 2013 Abstract These lecture notes
More informationCOMP200 - Object Oriented Programming: Test One Duration - 60 minutes
COMP200 - Object Oriented Programming: Test One Duration - 60 minutes Study the following class and answer the questions that follow: package shapes3d; public class Circular3DShape { private double radius;
More informationITI Introduction to Computing II
ITI 1121. Introduction to Computing II Marcel Turcotte School of Electrical Engineering and Computer Science Interface Abstract data types Version of January 26, 2013 Abstract These lecture notes are meant
More informationReviewing OO Concepts
Reviewing OO Concepts Users want to draw circles onto the display canvas. public class Circle { // more code here SWEN-261 Introduc2on to So3ware Engineering Department of So3ware Engineering Rochester
More informationInheritance. 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 informationCS 112 Programming 2. Lecture 10. Abstract Classes & Interfaces (1) Chapter 13 Abstract Classes and Interfaces
CS 112 Programming 2 Lecture 10 Abstract Classes & Interfaces (1) Chapter 13 Abstract Classes and Interfaces 2 1 Motivations We have learned how to write simple programs to create and display GUI components.
More informationChapter 8 Objects and Classes
Chapter 8 Objects and Classes 1 Motivations After learning the preceding chapters, you are capable of solving many programming problems using selections, loops, methods, and arrays. However, these Java
More informationPolymorphism: Interfaces and Iteration. Fundamentals of Computer Science
Polymorphism: Interfaces and Iteration Fundamentals of Computer Science Outline A shape object hierarchy Classes that extend Versus classes that implements Java interfaces How Java handles multiple-inheritance
More informationInheritance Sort in ascending order. Reusability 5 Sort Take The 4 Order 12,10,5,4. Class. Use this class to define a new class
CS 112 / Section 02 Ece Akhan, Serkan Fidancı, Birol Cabukusta Notes of March 18, 2008 and March 20, 2008: Inheritance Sort in ascending order Reusability 5 Sort 12 5 4 12 İn Take 10 12 Sort 5 10 Desc.
More informationChapter 8 Objects and Classes. Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All rights reserved.
Chapter 8 Objects and Classes 1 Motivations After learning the preceding chapters, you are capable of solving many programming problems using selections, loops, methods, and arrays. However, these Java
More informationAbstract 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 informationInheritance 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 information25. Interfaces. Java. Summer 2008 Instructor: Dr. Masoud Yaghini
25. Interfaces Java Summer 2008 Instructor: Dr. Masoud Yaghini Outline Definition The Comparable Interface Interfaces vs. Abstract Classes Creating Custom Interfaces References Definition Definition Sometimes
More informationObject 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 informationAdvanced Object-Oriented Programming. 11 Features. C# Programming: From Problem Analysis to Program Design. 4th Edition
11 Features Advanced Object-Oriented Programming C# Programming: From Problem Analysis to Program Design C# Programming: From Problem Analysis to Program Design 1 4th Edition Chapter Objectives 2 Chapter
More informationChapter 9 - Object-Oriented Programming: Inheritance
Chapter 9 - Object-Oriented Programming: Inheritance 9.1 Introduction 9.2 Superclasses and Subclasses 9.3 protected Members 9.4 Relationship between Superclasses and Subclasses 9.5 Case Study: Three-Level
More informationChapter 9 Objects and Classes. OO Programming Concepts. Classes. Objects. Motivations. Objectives. CS1: Java Programming Colorado State University
Chapter 9 Objects and Classes CS1: Java Programming Colorado State University Motivations After learning the preceding chapters, you are capable of solving many programming problems using selections, loops,
More informationMotivations. Chapter 13 Abstract Classes and Interfaces
Chapter 13 Abstract Classes and Interfaces CS1: Java Programming Colorado State University Original slides by Daniel Liang Modified slides by Chris Wilcox Motivations You have learned how to write simple
More informationOO Programming Concepts
Chapter 8 Objects and Classes 1 Motivations After learning the preceding chapters, you are capable of solving many programming problems using selections, loops, methods, and arrays. However, these Java
More informationInheritance. Inheritance
1 2 1 is a mechanism for enhancing existing classes. It allows to extend the description of an existing class by adding new attributes and new methods. For example: class ColoredRectangle extends Rectangle
More informationC18a: Abstract Class and Method
CISC 3115 TY3 C18a: Abstract Class and Method Hui Chen Department of Computer & Information Science CUNY Brooklyn College 10/31/2018 CUNY Brooklyn College 1 Outline Recap Inheritance and polymorphism Abstract
More informationInheritance & Polymorphism Recap. Inheritance & Polymorphism 1
Inheritance & Polymorphism Recap Inheritance & Polymorphism 1 Introduction! Besides composition, another form of reuse is inheritance.! With inheritance, an object can inherit behavior from another object,
More informationMotivations. Objectives. object cannot be created from abstract class. abstract method in abstract class
Motivations Chapter 13 Abstract Classes and Interfaces You have learned how to write simple programs to create and display GUI components. Can you write the code to respond to user actions, such as clicking
More informationChapter 13 Abstract Classes and Interfaces. Liang, Introduction to Java Programming, Tenth Edition, Global Edition. Pearson Education Limited
Chapter 13 Abstract Classes and Interfaces Liang, Introduction to Java Programming, Tenth Edition, Global Edition. Pearson Education Limited 2015 1 Motivations You have learned how to write simple programs
More informationCIS3023: Programming Fundamentals for CIS Majors II Summer 2010
CIS3023: Programming Fundamentals for CIS Majors II Summer 2010 Objects and Classes (contd.) Course Lecture Slides 19 May 2010 Ganesh Viswanathan Objects and Classes Credits: Adapted from CIS3023 lecture
More informationChapter 9 Objects and Classes. Liang, Introduction to Java Programming, Eleventh Edition, (c) 2017 Pearson Education, Inc. All rights reserved.
Chapter 9 Objects and Classes 1 Motivations After learning the preceding chapters, you are capable of solving many programming problems using selections, loops, methods, and arrays. However, these Java
More informationCS/ENGRD 2110 SPRING Lecture 2: Objects and classes in Java
1 CS/ENGRD 2110 SPRING 2014 Lecture 2: Objects and classes in Java http://courses.cs.cornell.edu/cs2110 Java OO (Object Orientation) 2 Python and Matlab have objects and classes. Strong-typing nature of
More informationCS Week 13. Jim Williams, PhD
CS 200 - Week 13 Jim Williams, PhD This Week 1. Team Lab: Instantiable Class 2. BP2 Strategy 3. Lecture: Classes as templates BP2 Strategy 1. M1: 2 of 3 milestone tests didn't require reading a file. 2.
More informationMaking New instances of Classes
Making New instances of Classes NOTE: revised from previous version of Lecture04 New Operator Classes are user defined datatypes in OOP languages How do we make instances of these new datatypes? Using
More informationLecture 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 informationCS 113 PRACTICE FINAL
CS 113 PRACTICE FINAL There are 13 questions on this test. The value of each question is: 1-10 multiple choice (4 pt) 11-13 coding problems (20 pt) You may get partial credit for questions 11-13. If you
More informationConstants are named in ALL_CAPS, using upper case letters and underscores in their names.
Naming conventions in Java The method signature Invoking methods All class names are capitalized Variable names and method names start with a lower case letter, but every word in the name after the first
More informationReview questions. Review questions, cont d. Class Definition. Methods. Class definition: methods. April 1,
April 1, 2003 1 Previous Lecture: Intro to OOP Class definition: instance variables & methods Today s Lecture: Instance methods Constructors Methods with input parameters Review questions Where do you
More informationAShape.java Sun Jan 21 22:32: /** * Abstract strategy to compute the area of a geometrical shape. Dung X. Nguyen * * Copyright
AShape.java Sun Jan 21 22:32:31 2001 1 Abstract strategy to compute the area of a geometrical shape. @author Dung X. Nguyen Copyright 1999 by Dung X. Nguyen - All rights reserved. Modifications by Alan
More informationCOMP 250. Lecture 29. interfaces. Nov. 18, 2016
COMP 250 Lecture 29 interfaces Nov. 18, 2016 1 ADT (abstract data type) ADT s specify a set of operations, and allow us to ignore implementation details. Examples: list stack queue binary search tree priority
More informationInheritance Motivation
Inheritance Inheritance Motivation Inheritance in Java is achieved through extending classes Inheritance enables: Code re-use Grouping similar code Flexibility to customize Inheritance Concepts Many real-life
More informationOverview. ITI Introduction to Computing II. Interface 1. Problem 1. Problem 1: Array sorting. Problem 1: Array sorting. Problem 1: Array sorting
Overview ITI 1121. Introduction to Computing II Rafael Falcon and Marcel Turcotte (with contributions from R. Holte) Electrical Engineering and Computer Science University of Ottawa Interface Abstract
More information8359 Object-oriented Programming with Java, Part 2. Stephen Pipes IBM Hursley Park Labs, United Kingdom
8359 Object-oriented Programming with Java, Part 2 Stephen Pipes IBM Hursley Park Labs, United Kingdom Dallas 2003 Intro to Java recap Classes are like user-defined types Objects are like variables of
More informationInheritance (continued) Inheritance
Objectives Chapter 11 Inheritance and Polymorphism Learn about inheritance Learn about subclasses and superclasses Explore how to override the methods of a superclass Examine how constructors of superclasses
More informationChapter 3 Objects and Classes
Chapter 3 Objects and Classes Topics OO Programming Concepts Creating Objects and Object Reference Variables Constructors Modifiers Instance and Class Variables and Methods Scope of Variables OO Programming
More informationJAVA 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 informationTopic 7: Algebraic Data Types
Topic 7: Algebraic Data Types 1 Recommended Exercises and Readings From Haskell: The craft of functional programming (3 rd Ed.) Exercises: 5.5, 5.7, 5.8, 5.10, 5.11, 5.12, 5.14 14.4, 14.5, 14.6 14.9, 14.11,
More informationCS111: 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