UFCE3T-15-M Object-oriented Design and Programming
|
|
- Cory Paul
- 5 years ago
- Views:
Transcription
1 UFCE3T-15-M Object-oriented Design and Programming Block1: Objects and Classes Jin Sa 27-Sep-05 UFCE3T-15-M Programming part 1
2 Objectives To understand objects and classes and use classes to model objects. To learn how to declare a class and how to create an object of a class. To understand the roles of constructors and use constructors to create objects. To distinguish between object reference variables and primitive data type variables. To use classes in the Java library. To declare private data field with appropriate get and set methods. 27-Sep-05 UFCE3T-15-M Programming part 2
3 Objectives To develop methods with object arguments. To understand the difference between instance and static variables and methods. To use the keyword this as the reference to the current object that invokes the instance method. To store and process objects in arrays. To understand the use of various visibility modifiers. To apply class abstraction to develop software. 27-Sep-05 UFCE3T-15-M Programming part 3
4 OO Programming Concepts Object-oriented programming (OOP) involves programming using objects. An object represents an entity in the real world that can be distinctly identified, e.g. a student, a desk, a circle. An object has a unique identity, state, and behaviors. The state of an object consists of a set of data fields with their current values. The behavior of an object is defined by a set of methods. 27-Sep-05 UFCE3T-15-M Programming part 4
5 Classes Classes are constructs that define objects of the same type. A Java class uses variables to define data fields and methods to define behaviors. Constructors are special methods, which are invoked to construct objects from the class. A class is a template that defines what an object s data and methods will be. An object is an instance of a class. 27-Sep-05 UFCE3T-15-M Programming part 5
6 Classes class Circle { /** The radius of this circle */ double radius = 1.0; /** Construct a circle object */ Circle() { /** Construct a circle object */ Circle(double newradius) { radius = newradius; Data field/ attributes More than one constructors /** Return the area of this circle */ double findarea() { return radius * radius * ; Method 27-Sep-05 UFCE3T-15-M Programming part 6
7 Circle() { Constructors Circle(double newradius) { radius = newradius; Constructors are a special kind of methods that are invoked to construct objects. 27-Sep-05 UFCE3T-15-M Programming part 7
8 Constructors, cont. A constructor with no parameters is referred to as a no-arg constructor. Constructors must have the same name as the class itself. Constructors do not have a return type not even void. Constructors are invoked using the new operator when an object is created. Constructors play the role of initializing objects. 27-Sep-05 UFCE3T-15-M Programming part 8
9 Creating Objects Using new ClassName(); Constructors Example: new Circle(); new Circle(5.0); 27-Sep-05 UFCE3T-15-M Programming part 9
10 Default Constructor A class may be declared without constructors. In this case, a no-arg constructor with an empty body is implicitly declared in the class. This constructor, called a default constructor, is provided automatically only if no constructors are explicitly declared in the class. 27-Sep-05 UFCE3T-15-M Programming part 10
11 Declaring Object Reference Variables To reference an object, assign the object to a reference variable. To declare a reference variable, use the syntax: ClassName objectrefvar; Example: Circle mycircle; 27-Sep-05 UFCE3T-15-M Programming part 11
12 Declaring/Creating Objects in a Single Step ClassName objectrefvar = new ClassName(); Assign object reference Create an object Example: Circle mycircle = new Circle(); 27-Sep-05 UFCE3T-15-M Programming part 12
13 Accessing Objects Referencing the object s data: objectrefvar.data e.g., mycircle.radius Invoking the object s method: objectrefvar.methodname(arguments) e.g., mycircle.findarea() 27-Sep-05 UFCE3T-15-M Programming part 13
14 Example: Using Objects Objective: Demonstrate creating objects, accessing data, and using methods. (run../sourcecode/codeblock1/testsimplecircle.java) 27-Sep-05 UFCE3T-15-M Programming part 14
15 // SimpleCircle class has two constructors class SimpleCircle { double radius; /** Construct a circle with radius 1 */ SimpleCircle() { radius = 1.0; /** Construct a circle with a specified radius */ SimpleCircle(double newradius) { radius = newradius; /** Return the area of this circle */ double findarea() { return radius * radius * 3.14; 27-Sep-05 UFCE3T-15-M Programming part 15
16 public class TestSimpleCircle { /** Main method */ public static void main(string[] args) { // Create a circle with radius 5.0 SimpleCircle mycircle = new SimpleCircle(5.0); System.out.println("The area for radius" + mycircle.radius + " is "+mycircle.findarea()); // Create a circle with radius 1 SimpleCircle yourcircle = new SimpleCircle(); System.out.println(...); // Modify circle radius yourcircle.radius = 100; System.out.println(...); 27-Sep-05 UFCE3T-15-M Programming part 16
17 Differences between Variables of rimitive Data Types and Object Types Primitive type int i = 1 i 1 Created using new Circle() Object type Circle c c reference c: Circle radius = 1 27-Sep-05 UFCE3T-15-M Programming part 17
18 Copying Variables of Primitive Data Types and Object Types Primitive type assignment i = j Object type assignment c1 = c2 Before: After: Before: After: i 1 i 2 c1 c1 j 2 j 2 c2 c2 c1: Circle c2: Circle radius = 5 radius = 9 27-Sep-05 UFCE3T-15-M Programming part 18
19 Using Classes from the Java Library We declared the Circle class and created objects from the class. Often you will use the classes in the Java library to develop programs. 27-Sep-05 UFCE3T-15-M Programming part 19
20 Use of Math class in Java.lang class SimpleCircle { double radius;... /** Return the area of this circle */ double findarea() { return (radius * radius * Math.PI); 27-Sep-05 UFCE3T-15-M Programming part 20
21 The Date Class Java provides a system-independent encapsulation of date and time in the java.util.date class. You can use the Date class to create an instance for the current date and time and use its tostring method to return the date and time as a string. 27-Sep-05 UFCE3T-15-M Programming part 21
22 Use the Date class For example, the following code java.util.date date = new java.util.date(); System.out.println(date.toString()); displays a string like Tue Sep 27 13:50:19 EST Sep-05 UFCE3T-15-M Programming part 22
23 Visibility Modifiers public The class, data, or method is visible to any class in any package. private The data or methods can be accessed only by the declaring class. By default, the class, variable, or method can accessed by any class in the same package. 27-Sep-05 UFCE3T-15-M Programming part 23
24 package p1; public class C1 { public int x; int y; private int z; public void m1() { void m2() { private void m3() { public class C2 { C1 o = new C1(); can access o.x; can access o.y; cannot access o.z; can invoke o.m1(); can invoke o.m2(); cannot invoke o.m3(); package p2; public class C3 { C1 o = new C1(); can access o.x; cannot access o.y; cannot access o.z; can invoke o.m1(); cannot invoke o.m2(); cannot invoke o.m3(); The private modifier restricts access to within an object, the default modifier restricts access to within a package, and the public modifier enables unrestricted access. 27-Sep-05 UFCE3T-15-M Programming part 24
25 Why Data Fields Should Be private? To protect data. To make class easy to maintain. 27-Sep-05 UFCE3T-15-M Programming part 25
26 Example of Data Field Encapsulation In this example, private data are used for the radius and the accessor (or get and set) methods getradius and setradius are provided for the clients to retrieve and modify the radius. 27-Sep-05 UFCE3T-15-M Programming part 26
27 public class Circle { private double radius; // private attribute... /** Use a get method to return radius */ public double getradius() { return radius; /** Use a set method to set a new radius */ public void setradius(double newradius) { radius = (newradius >= 0)? newradius : 0; Sep-05 UFCE3T-15-M Programming part 27
28 // TestCircle.java: Demonstrate private modifier public class TestCircle { /** Main method */ public static void main(string[] args) { Circle mycircle = new Circle(5.0); System.out.println("The area for radius " + mycircle.getradius() + " is " + mycircle.findarea()); // Double mycircle's radius mycircle.setradius(mycircle.getradius() * 2); System.out.println("The area radius " + mycircle.getradius() + " is " + mycircle.findarea()); 27-Sep-05 UFCE3T-15-M Programming part 28
29 Passing Objects to Methods Passing by value for primitive type value (the value is passed to the parameter) Passing by value for reference type value (the value is the reference to the object) 27-Sep-05 UFCE3T-15-M Programming part 29
30 public class TestPassObject { /** Print a table of areas for radius */ public void printareasupto(circle c, int times) { System.out.println("Radius \t\tarea"); for (int i=0; i<times; i++) { System.out.println(c.getRadius() + "\t\t\t" + c.findarea()); c.setradius(c.getradius() + 1); // end of printareaupto 27-Sep-05 UFCE3T-15-M Programming part 30
31 /** Main method */ public static void main(string[] args) { // Create a Circle object with radius 1 Circle mycircle = new Circle(); TestPassObject mypassobject = new TestPassObject(); //Print areas for radius 1, 2, 3, 4, 5. mypassobject.printareasupto(mycircle, 5); 27-Sep-05 UFCE3T-15-M Programming part 31
32 Instance Variables, and Methods Instance variables belong to a specific instance. Instance methods are invoked by an instance of the class. 27-Sep-05 UFCE3T-15-M Programming part 32
33 Static (Class) Variables, Constants, and Methods Static variables are shared by all the instances of the class. Static methods are not tied to a specific object. Static constants are final variables shared by all the instances of the class. 27-Sep-05 UFCE3T-15-M Programming part 33
34 Static Variables, Constants, and Methods, cont. To declare static variables, constants, and methods, use the static modifier. 27-Sep-05 UFCE3T-15-M Programming part 34
35 Example of Using Instance and Class Variables and Method Objective: Demonstrate the roles of instance and class variables and their uses. This example adds a class variable numofobjects to track the number of Circle objects created. 27-Sep-05 UFCE3T-15-M Programming part 35
36 public class CircleStatic { private double radius; /** The number of the objects created */ private static int numberofobjects = 0; /** Construct a circle with radius 1 */ public CircleStatic() { radius = 1.0; numberofobjects++; public CircleStatic(double newradius) { radius = newradius; numberofobjects++; 27-Sep-05 UFCE3T-15-M Programming part 36
37 ... /** Set a new radius */ public void setradius(double newradius) { radius = newradius; /** Return numberofobjects */ public static int getnumberofobjects() { return numberofobjects; public double findarea() { return radius * radius * Math.PI; 27-Sep-05 UFCE3T-15-M Programming part 37
38 public class TestCircleStatic { /** Main method */ public static void main(string[] args) { CircleStatic circle1 = new CircleStatic(); System.out.println("Circle1 is radius: " + circle1.getradius() + "and number of Circle objects:" + CircleStatic.getNumberOfObjects()); CircleStatic circle2 = new CircleStatic(5); System.out.println("Circle2 is radius: " + circle2.getradius() + "and number of Circle objects:" + CircleStatic.getNumberOfObjects()); 27-Sep-05 UFCE3T-15-M Programming part 38
39 The this Keyword Use this to refer to the object that invokes the instance method. Use this to refer to an instance data field. 27-Sep-05 UFCE3T-15-M Programming part 39
40 Example of using this lass Foo { int i = 5; static double k = 0; void seti(int i) { this.i = i; Suppose that f1 and f2 are two objects of Foo Invoking f1.seti(10) is to execute f1.i = 10, where this is replaced by f1 Invoking f2.seti(45) is to execute f2.i = 45, where this is replaced by f2 27-Sep-05 UFCE3T-15-M Programming part 40
41 Example of using this public class Circle { private double radius; public Circle(double radius) { this.radius = radius; public Circle() { this(1.0); this must be explicitly used to reference the data field radius of the object being constructed this is used to invoke another constructor public double findarea() { return radius * radius * Math.PI; 27-Sep-05 UFCE3T-15-M Programming part 41
42 Array of Objects Circle[] circlearray = new Circle[10]; An array of objects is actually an array of reference variables. circlearray[1].findarea() involves two levels of referencing. circlearray references to the entire array. circlearray[1] references to a Circle object. 27-Sep-05 UFCE3T-15-M Programming part 42
43 Array of Objects, cont. Circle[] circlearray = new Circle[10]; circlearray reference circlearray[0] Circle object 0 circlearray[1] Circle object 1 circlearray[9] Circle object 9 27-Sep-05 UFCE3T-15-M Programming part 43
44 Array of Objects, cont. Example: add up the areas of the circles 27-Sep-05 UFCE3T-15-M Programming part 44
45 public class ManyCircles { Circle[] circlearray; public void createcirclearray() { circlearray = new Circle[10]; for (int i = 0; i < circlearray.length; i++) { circlearray[i] = new Circle(Math.random() * 100); public void printcirclearray() { System.out.println("Radius\t\t\t\t" + "Area"); for (int i = 0; i < circlearray.length; i++) { System.out.print(circleArray[i].getRadius() + "\t\t" + circlearray[i].findarea() + '\n'); 27-Sep-05 UFCE3T-15-M Programming part 45
46 /** Add circle areas */ public void sumarray() { // Initialize sum double sum = 0; // Add areas to sum for (int i=0; i<circlearray.length; i++) sum += circlearray[i].findarea(); System.out.println( "The area of all the circles: "+ sum); 27-Sep-05 UFCE3T-15-M Programming part 46
47 /** Main method */ public static void main(string[] args) { ManyCircles allcircles = new ManyCircles(); // Create circlearray allcircles.createcirclearray(); // Print circlearray allcircles.printcirclearray(); // Print total areas of the circles allcircles.sumarray(); 27-Sep-05 UFCE3T-15-M Programming part 47
48 Class Abstraction and Encapsulation Class abstraction means to separate class implementation from the use of the class. The creator of the class provides a description of the class and let the user know how the class can be used. The user of the class does not need to know how the class is implemented. The detail of implementation is encapsulated and hidden from the user using the visibility modifiers. 27-Sep-05 UFCE3T-15-M Programming part 48
Chapter 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 informationChapter 9. Objects and Classes
Chapter 9 Objects and Classes 1 OO Programming in Java Other than primitive data types (byte, short, int, long, float, double, char, boolean), everything else in Java is of type object. Objects we already
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 informationChapter 9 Objects and Classes. Liang, Introduction to Java Programming, Tenth Edition, (c) 2015 Pearson Education, Inc. All rights reserved.
Chapter 9 Objects and Classes rights reserved. 1 Motivations After learning the preceding chapters, you are capable of solving many programming problems using selections, loops, methods, and arrays. However,
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 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 informationECOM 2324 COMPUTER PROGRAMMING II
ECOM 2324 COMPUTER PROGRAMMING II Object Oriented Programming with JAVA Instructor: Ruba A. Salamh Islamic University of Gaza 2 CHAPTER 9 OBJECTS AND CLASSES Motivations 3 After learning the preceding
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 informationOO Programming Concepts. Classes. Objects. Chapter 8 User-Defined Classes and ADTs
Chapter 8 User-Defined Classes and ADTs Objectives To understand objects and classes and use classes to model objects To learn how to declare a class and how to create an object of a class To understand
More informationLiang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All rights reserved.
Chapter 8 Objects and Classes Lecture notes for computer programming 1 Faculty of Engineering and Information Technology Prepared by: Iyad Albayouk 1 Motivations After learning the preceding chapters,
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 informationChapter 8 Objects and Classes Part 1
Chapter 8 Objects and Classes Part 1 1 OO Programming Concepts Object-oriented programming (OOP) involves programming using objects. An object represents an entity in the real world that can be distinctly
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 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 informationIntroduction to OOP with Java. Instructor: AbuKhleif, Mohammad Noor Sep 2017
Introduction to OOP with Java Instructor: AbuKhleif, Mohammad Noor Sep 2017 Lecture 07: OOP Part 1 Instructor: AbuKhleif, Mohammad Noor Sep 2017 Instructor AbuKhleif, Mohammad Noor Computer Engineer (JU
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 and Text I/O Chapter 9 Inheritance and Polymorphism GUI can be covered after 10.2, Abstract Classes Chapter 12 GUI Basics 10.2, Abstract
More informationChapter 9 Objects and Classes. Liang, Introduction to C++ Programming, (c) 2007 Pearson Education, Inc. All rights reserved.
Chapter 9 Objects and Classes 1 Objectives Classes & Objects ( 9.2). UML ( 9.2). Constructors ( 9.3). How to declare a class & create an object ( 9.4). Separate a class declaration from a class implementation
More informationChapter 11 Object-Oriented Design Exception and binary I/O can be covered after Chapter 9
Chapter 7 Objects and Classes Chapter 6 Arrays Chapter 7 Objects and Classes Chapter 8 Strings and Text I/O Chapter 9 Inheritance and Polymorphism GUI can be covered after 10.2, Abstract Classes Chapter
More informationCS 170, Section /3/2009 CS170, Section 000, Fall
Lecture 18: Objects CS 170, Section 000 3 November 2009 11/3/2009 CS170, Section 000, Fall 2009 1 Lecture Plan Homework 5 : questions, comments? Managing g g Data: objects to make your life easier ArrayList:
More informationProgramming in the Large II: Objects and Classes (Part 1)
Programming in the Large II: Objects and Classes (Part 1) 188230 Advanced Computer Programming Asst. Prof. Dr. Kanda Runapongsa Saikaew (krunapon@kku.ac.th) Department of Computer Engineering Khon Kaen
More information2 What are the differences between constructors and methods?
1 Describe the relationship between an object and its defining class. How do you define a class? How do you declare an object reference variable? How do you create an object? How do you declare and create
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 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 informationChapter 8 Objects and Classes Dr. Essam Halim Date: Page 1
Assignment (1) Chapter 8 Objects and Classes Dr. Essam Halim Date: 18-3-2014 Page 1 Section 8.2 Defining Classes for Objects 1 represents an entity in the real world that can be distinctly identified.
More informationObject-Oriented Programming Concepts
Object-Oriented Programming Concepts Real world objects include things like your car, TV etc. These objects share two characteristics: they all have state and they all have behavior. Software objects are
More informationClasses and Objects. CGS 3416 Spring 2018
Classes and Objects CGS 3416 Spring 2018 Classes and Objects An object is an encapsulation of data along with functions that act upon that data. It attempts to mirror the real world, where objects have
More informationObjects and Classes. 1 Creating Classes and Objects. CSCI-UA 101 Objects and Classes
Based on Introduction to Java Programming, Y. Daniel Liang, Brief Version, 10/E 1 Creating Classes and Objects Classes give us a way of defining custom data types and associating data with operations on
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 informationClasses - 2. Data Processing Course, I. Hrivnacova, IPN Orsay
Classes - 2 Data Processing Course, I. Hrivnacova, IPN Orsay OOP, Classes Reminder Requirements for a Class Class Development Constructor Access Control Modifiers Getters, Setters Keyword this const Member
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 informationClasses. Classes. Classes. Class Circle with methods. Class Circle with fields. Classes and Objects in Java. Introduce to classes and objects in Java.
Classes Introduce to classes and objects in Java. Classes and Objects in Java Understand how some of the OO concepts learnt so far are supported in Java. Understand important features in Java classes.
More informationLast lecture. Lecture 9. in a nutshell. in a nutshell 2. Example of encapsulation. Example of encapsulation. Class test. Procedural Programming
1 Lecture 9 Last lecture Class test Has been marked Collect your marks at your next seminar Seminars There are seminars this week to go through the class test Meet in the classroom indicated on the timetable
More informationAP Computer Science Chapter 10 Implementing and Using Classes Study Guide
AP Computer Science Chapter 10 Implementing and Using Classes Study Guide 1. A class that uses a given class X is called a client of X. 2. Private features of a class can be directly accessed only within
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 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 informationObject Oriented Programming SCJ2153. Class and Object. Associate Prof. Dr. Norazah Yusof
Object Oriented Programming SCJ2153 Class and Object Associate Prof. Dr. Norazah Yusof Classes Java program consists of classes. Class is a template for creating objects. Class normally consists of 3 components:
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 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 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 informationObject 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 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 informationObject-Oriented Programming Concepts
Object-Oriented Programming Concepts Object-oriented programming מונחה עצמים) (תכנות involves programming using objects An object ) represents (עצם an entity in the real world that can be distinctly identified
More informationLecture 6 Introduction to Objects and Classes
Lecture 6 Introduction to Objects and Classes Outline Basic concepts Recap Computer programs Programming languages Programming paradigms Object oriented paradigm-objects and classes in Java Constructors
More informationObject Oriented Programming in C#
Introduction to Object Oriented Programming in C# Class and Object 1 You will be able to: Objectives 1. Write a simple class definition in C#. 2. Control access to the methods and data in a class. 3. Create
More informationInf1-OOP. Data Types. Defining Data Types in Java. type value set operations. Overview. Circle Class. Creating Data Types 1.
Overview Inf1-OOP Creating Data Types 1 Circle Class Object Default Perdita Stevens, adapting earlier version by Ewan Klein Format Strings School of Informatics January 11, 2015 HotelRoom Class More on
More information141214 20219031 1 Object-Oriented Programming concepts Object-oriented programming ( תכנות מונחה עצמים ) involves programming using objects An object ) (עצם represents an entity in the real world that
More informationWhat 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 informationChapter 5 Programming with Objects and Classes
Chapter 5 Programming with Objects and Classes OO Programming Concepts Declaring and Creating Objects Constructors Modifiers (public, private and static) Instance and Class Variables and Methods Scope
More informationChapter 4. Defining Classes I
Chapter 4 Defining Classes I Introduction Classes are the most important language feature that make object-oriented programming (OOP) possible Programming in Java consists of defining a number of classes
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 informationJAVA CLASSES AND OBJECTS
SE2205B - DATA STRUCTURES AND ALGORITHMS JAVA CLASSES AND OBJECTS Kevin Brightwell Thursday January 12th, 2017 Acknowledgements:Dr. Quazi Rahman 1 / 31 LECTURE OUTLINE Course Updates Arrays Objects and
More informationCOMP 250 Winter 2011 Reading: Java background January 5, 2011
Almost all of you have taken COMP 202 or equivalent, so I am assuming that you are familiar with the basic techniques and definitions of Java covered in that course. Those of you who have not taken a COMP
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 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 informationChapter 6 Introduction to Defining Classes
Introduction to Defining Classes Fundamentals of Java: AP Computer Science Essentials, 4th Edition 1 Objectives Design and implement a simple class from user requirements. Organize a program in terms of
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 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 informationJAVA: A Primer. By: Amrita Rajagopal
JAVA: A Primer By: Amrita Rajagopal 1 Some facts about JAVA JAVA is an Object Oriented Programming language (OOP) Everything in Java is an object application-- a Java program that executes independently
More informationComputer Science II (20073) Week 1: Review and Inheritance
Computer Science II 4003-232-01 (20073) Week 1: Review and Inheritance Richard Zanibbi Rochester Institute of Technology Review of CS-I Hardware and Software Hardware Physical devices in a computer system
More informationQuestions Answer Key Questions Answer Key Questions Answer Key
Benha University Term: 2 nd (2013/2014) Class: 2 nd Year Students Subject: Object Oriented Programming Faculty of Computers & Informatics Date: 26/4/2014 Time: 1 hours Exam: Mid-Term (A) Name:. Status:
More informationCLASSES AND OBJECTS. Fundamentals of Computer Science I
CLASSES AND OBJECTS Fundamentals of Computer Science I Outline Primitive types Creating your own data types Classes Objects Instance variables Instance methods Constructors Arrays of objects A Foundation
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 informationObject Oriented Programming COP3330 / CGS5409
Object Oriented Programming COP3330 / CGS5409 Classes & Objects DDU Design Constructors Member Functions & Data Friends and member functions Const modifier Destructors Object -- an encapsulation of data
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 informationInf1-OP. Creating Classes. Volker Seeker, adapting earlier version by Perdita Stevens and Ewan Klein. February 26, School of Informatics
Inf1-OP Creating Classes Volker Seeker, adapting earlier version by Perdita Stevens and Ewan Klein School of Informatics February 26, 2018 Creating classes Last time we saw how to use a class: create a
More informationClass Foo. instance variables. instance methods. Class FooTester. main {
Creating classes Inf1-OP Creating Classes Volker Seeker, adapting earlier version by Perdita Stevens and Ewan Klein School of Informatics February 26, 2018 Last time we saw how to use a class: create a
More informationCmSc 150 Fundamentals of Computing I. Lesson 28: Introduction to Classes and Objects in Java. 1. Classes and Objects
CmSc 150 Fundamentals of Computing I Lesson 28: Introduction to Classes and Objects in Java 1. Classes and Objects True object-oriented programming is based on defining classes that represent objects with
More informationChapter 4 Defining Classes I
Chapter 4 Defining Classes I This chapter introduces the idea that students can create their own classes and therefore their own objects. Introduced is the idea of methods and instance variables as the
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 informationPractice Questions for Chapter 9
Practice Questions for Chapter 9 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) An object is an instance of a. 1) A) program B) method C) class
More informationOracle 1Z Java SE 8 Programmer I. Download Full Version :
Oracle 1Z0-808 Java SE 8 Programmer I Download Full Version : https://killexams.com/pass4sure/exam-detail/1z0-808 QUESTION: 121 And the commands: Javac Jump.java Java Jump crazy elephant is always What
More informationGraphical 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 informationCS151 Principles of Computer Science I Fall 2018 Homework 6 S
1. Exercise 19 : double Exercise 20 : String CS151 Principles of Computer Science I Fall 2018 Homework 6 S Exercise 21 : foo1 is a class method since it is declared static Exercise 22 : foo2 is an instance
More informationObject Class. EX: LightSwitch Class. Basic Class Concepts: Parts. CS257 Computer Science II Kevin Sahr, PhD. Lecture 5: Writing Object Classes
1 CS257 Computer Science II Kevin Sahr, PhD Lecture 5: Writing Object Classes Object Class 2 objects are the basic building blocks of programs in Object Oriented Programming (OOP) languages objects consist
More informationSimple Java Reference
Simple Java Reference This document provides a reference to all the Java syntax used in the Computational Methods course. 1 Compiling and running... 2 2 The main() method... 3 3 Primitive variable types...
More informationLecture 7: Classes and Objects CS2301
Lecture 7: Classes and Objects NADA ALZAHRANI CS2301 1 What is OOP? Object-oriented programming (OOP) involves programming using objects. An object represents an entity in the real world that can be distinctly
More informationComments are almost like C++
UMBC CMSC 331 Java Comments are almost like C++ The javadoc program generates HTML API documentation from the javadoc style comments in your code. /* This kind of comment can span multiple lines */ //
More informationQuestions Answer Key Questions Answer Key Questions Answer Key
Benha University Term: 2 nd (2013/2014) Class: 2 nd Year Students Subject: Object Oriented Programming Faculty of Computers & Informatics Date: 26/4/2014 Time: 1 hours Exam: Mid-Term (C) Name:. Status:
More informationCS111: PROGRAMMING LANGUAGE II. Lecture 1: Introduction to classes
CS111: PROGRAMMING LANGUAGE II Lecture 1: Introduction to classes Lecture Contents 2 What is a class? Encapsulation Class basics: Data Methods Objects Defining and using a class In Java 3 Java is an object-oriented
More informationPrograms as Models. Procedural Paradigm. Class Methods. CS256 Computer Science I Kevin Sahr, PhD. Lecture 11: Objects
CS256 Computer Science I Kevin Sahr, PhD Lecture 11: Objects 1 Programs as Models remember: we write programs to solve realworld problems programs act as models of the real-world problem to be solved one
More informationIntroduction to Classes and Objects How to manage data and actions together. Slides #10: Chapter
Topics 1) What is an object? What is a class? 2) How can we use objects? 3) How do we implement the functions of a class? Introduction to Classes and s How to manage data and actions together. Slides #10:
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 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 informationThe Essence of OOP using Java, Nested Top-Level Classes. Preface
The Essence of OOP using Java, Nested Top-Level Classes Baldwin explains nested top-level classes, and illustrates a very useful polymorphic structure where nested classes extend the enclosing class and
More informationCS101 Quiz No. 4 Nov. 30 & Dec. 1, 2015 Student Name: Kadir Can Çelik (Extended on Dec. 6, 2015)
CS101 Quiz No. 4 Nov. 30 & Dec. 1, 2015 Student Name: Kadir Can Çelik (Extended on Dec. 6, 2015) CS101 Quiz No. 4 Nov. 30 & Dec. 1, 2015 Student Name: Kadir Can Çelik 1. Create a class called Circle with
More informationCS1004: Intro to CS in Java, Spring 2005
CS1004: Intro to CS in Java, Spring 2005 Lecture #13: Java OO cont d. Janak J Parekh janak@cs.columbia.edu Administrivia Homework due next week Problem #2 revisited Constructors, revisited Remember: a
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 informationPractice 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 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 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 informationJava Class Design. Eugeny Berkunsky, Computer Science dept., National University of Shipbuilding
Java Class Design Eugeny Berkunsky, Computer Science dept., National University of Shipbuilding eugeny.berkunsky@gmail.com http://www.berkut.mk.ua Objectives Implement encapsulation Implement inheritance
More informationException-Handling Overview
م.عبد الغني أبوجبل Exception Handling No matter how good a programmer you are, you cannot control everything. Things can go wrong. Very wrong. When you write a risky method, you need code to handle the
More informationCLASSES AND OBJECTS. Summer 2018
CLASSES AND OBJECTS Summer 2018 OBJECT BASICS Everything in Java is part of a class This includes all methods (functions) Even the main() function is part of a class Classes are declared similar to C++
More informationChapter 1-9, 12-13, 18, 20, 23 Review Slides. What is a Computer?
Chapter 1-9, 12-13, 18, 20, 23 Review Slides CS1: Java Programming Colorado State University Original slides by Daniel Liang Modified slides by Chris Wilcox rights reserved. 1 What is a Computer? A computer
More informationUse the scantron sheet to enter the answer to questions (pages 1-6)
Use the scantron sheet to enter the answer to questions 1-100 (pages 1-6) Part I. Mark A for True, B for false. (1 point each) 1. Abstraction allow us to specify an object regardless of how the object
More informationCSEN401 Computer Programming Lab. Topics: Introduction and Motivation Recap: Objects and Classes
CSEN401 Computer Programming Lab Topics: Introduction and Motivation Recap: Objects and Classes Prof. Dr. Slim Abdennadher 16.2.2014 c S. Abdennadher 1 Course Structure Lectures Presentation of topics
More informationClasses. Logical method to organise data and functions in a same structure. Also known as abstract data type (ADT).
UNITII Classes Logical method to organise data and functions in a same structure. Also known as abstract data type (ADT). It s a User Defined Data-type. The Data declared in a Class are called Data- Members
More informationCOMP 202. More on OO. CONTENTS: static revisited this reference class dependencies method parameters variable scope method overloading
COMP 202 CONTENTS: static revisited this reference class dependencies method parameters variable scope method overloading More on OO COMP 202 - Week 7 1 Static member variables So far: Member variables
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 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 information