... gain a foun-
dation in object- orientedprogramming along with the VB language basics. Programmers
transitioning from a procedural -oriented programming model to an object- oriented model
will also ... there are many pre NET VB programmers who
do not have a firm grasp of object- oriented programming. Now is the time to become acquainted
with the fundamentals of object- orientedprogramming before ... implementation.
Objects
As I noted earlier, we live in an object- oriented world. You are an object. You interact with
other objects. To write this book I am interacting with a computer object. When...
... appreciate all that object- orientedprogramming and C# can do
for you.
flast.indd xxvflast.indd xxv 10/8/2012 8:54:52 AM10/8/2012 8:54:52 AM
BEGINNING
Object- OrientedProgramming
with C#
Jack Purdum
ffirs.indd ... program
Welcome to the world of object- orientedprogramming and C#! The primary goal of this
book is to use the C# programming language from Microsoft to teach you object- oriented
programming, or OOP. ... Finally, the programming examples I use also build on concepts presented
1
c01.indd 3c01.indd 3 10/8/2012 8:46:46 AM10/8/2012 8:46:46 AM
BEGINNING
OBJECT ORIENTEDPROGRAMMINGWITH C#
INTRODUCTION...
... to switch the way you think about
programming to use the object- orientedprogramming paradigm.
What Is an Object- Oriented System?
Just what is an object- oriented system? What makes an OO system ... programmers are using an object-
oriented programming language, it doesn't mean they are writing
good object- oriented programs. Without a good understanding of
object orientation, it is ... used for OO development, object- oriented
designs are inherently easier to design and maintain over time.
Object- Oriented Languages
There are several object- orientedprogramming languages available...
... 124
oppubb.book Page 6 Tuesday, March 16, 2004 12:23 PM
Object- orientedProgrammingwith COBOL
4
Part 2: Object- oriented COBOL Programming
3 Using Objects in Programs . . . . . . . . . . . . . . . ... 12:23 PM
Object- orientedProgrammingwith COBOL
42 Chapter 3 Using Objects in Programs
Creating a New Instance Object
When you create a new object, the run-time system allocates an object
handle, ... "message"
ã Copy an object reference to another. For example:
set anObject1 to anObject2
ã Test whether two object references refer to the same object. For
example:
if anObject1 = anObject2
Micro...
... Intended Audience
Object- OrientedProgrammingwith Java is written for first-year college/univer-
sity programming courses worldwide. It introduces you to object- oriented
design and programming and ... J.)
Object- orientedprogrammingwith Java / Barry Holmes, Daniel Joyce.
p. cm.
Includes bibliographical references and index.
ISBN 0-7637-1435-6
1. Java (Computer program language) 2. Object- oriented ... repre-
sent the contents of a bit with the numbers 0 or 1.
This page intentionally left blank
Object- Oriented
ProgrammingWith Java,
Second Edition
Barry J. Holmes
Daniel T. Joyce
JONES AND BARTLETT...
... Move
Polygon objects
ObjectOriented
Programming with C++/
Session 1/ 24 of 50
Class Animals and its subclasses
Animals
Insects Mammals
Reptiles
Amphibians
ObjectOriented
Programming with ... Oriented
Programming with C++/
Session 1/ 2 of 50
Session Objectives
Discuss the following:
ã
The Object- Oriented approach
ã
Drawbacks of traditional programming
ã
Object- Oriented programming
Discuss ... into a single indivisible thing an object.
■
Close match between objects in the programming sense and objects
in the real world.
ObjectOriented
Programming with C++/
Session 1/ 29 of 50
Polymorphism
■
Polymorphism...
... ObjectOriented
Programming with C++/
Session 2/ 26 of 37
Objects, data members and member functions in
memory
Object 1
data 1
data 2
Object 2
data 1
data 2
Object 3
data 1
data ... index)
{ index = 5;} //error
ObjectOriented
Programming with C++/
Session 2/ 29 of 37
The count is common
Count:
3 cars in the race
ObjectOriented
Programming with C++/
Session 2/ 28 of ... a constant
ObjectOriented
Programming with C++/
Session 2/ 25 of 37
Objects and functions in memory
Each object has its own copy of the data
members of the class.
All the objects in...
... An object is an entity which has bundles of properties and
methods and can interact with other objects. An object can be sufcient or it
may have dependencies over other objects. But an object ... and the other
is object oriented. You can even write procedural code in PHP5 and it will run
without any problems. If you are not clear about procedural and objectoriented
programming, then ... PHP5
Objects in PHP5 differ a lot from objects in PHP4. OOP became matured enough in
true sense from PHP5. OOP was introduced since PHP3 but that was just an illusion
for real objectoriented programming. ...
... program.
ObjectOriented
Programming with C++/
Session 3/ 27 of 35
Scope rules (Contd.)
void main()
{
first object1 ;
second object2 ;
object1 .display();
//no function overloading takes place
object2 .display();
}
ã
The ... from the
calling function
Object OrientedProgrammingwith C++/ Session 3 / 1 of 35
Function Overloading and
References
Session 3
ObjectOriented
Programming with C++/
Session 3/ 4 of 35
Functions
A ... indicate an error.
ObjectOriented
Programming with C++/
Session 3/ 31 of 35
Passing references (Contd.)
Do not think of a reference as a pointer to
an object. A reference is the object. It is...
... are objects of a class.
ObjectOrientedProgrammingwith C++/ Session
4/ 43 of 49
Conversion between Objects (Contd.)
objectA = objectB;
objectA: object of destination class
objectB: object ... temp; //return temp object
}
■
Now we are able to perform addition of objects
with a statement,
obj3 = obj1 + obj2; //objects of class Sample
ObjectOrientedProgrammingwith C++/ Session
4/ ... assigned to a third object, if
you use the syntax
obj3 = obj1 + obj2;
instead of,
obj3.addobjects(obj1,obj2);
ObjectOrientedProgrammingwith C++/ Session
4/ 3 of 49
Session Objectives (Contd.)...
... contains Y
public:
Y abc;
};
ObjectOriented
Programming with C++/
Session 5 / 31 of 41
Constructors (Contd.)
When you declare an object of the derived
class, with the statement
Derived obj; ... Manager
}
ã
An object of a derived class can be treated as
an object of its base class when manipulated
through pointers. However, the opposite is not
true.
Object OrientedProgrammingwith C++/ ... class object
a1.func(); //calls derived class func
}
ObjectOriented
Programming with C++/
Session 5 / 7 of 41
Base Class and Derived Class
Derivation can be
represented graphically
with...
... Base
ObjectOrientedProgrammingwith C++ / Session
6 / 20 of 44
Virtual Base Classes (Contd.)
■
Virtual base class
is represented by
a single object of
the class.
■
Note the
difference with ... effectively under
dynamic binding.
ObjectOrientedProgrammingwith C++ / Session
6 / 26 of 44
Virtual functions(Contd.)
■
The address of the derived class object is
assigned to a pointer of ... resolves it.
ObjectOrientedProgrammingwith C++ / Session
6 / 38 of 44
Abstract Classes
■
A class containing one or more pure virtual
functions cannot be used to define an object
called...
... basic object- oriented terms are as follows:
Class: A class is a template for an object. A class contains the code which denes
how an object will behave and interact either with each other, or with ... PHP5
Objects in PHP5 differ a lot from objects in PHP4. OOP became matured enough in
true sense from PHP5. OOP was introduced since PHP3 but that was just an illusion
for real objectoriented programming. ... this chapter we learned about the objectorientedprogramming and how it ts
in with PHP. We have also learned some benets over procedural and functional
programming. However, we haven't...
... means that $someObject class has a method named
getObjectOne() which returns an object named $objectOne. This $objectOne has
another method named getObjectTwo() which returns an object whose method ... methods and attributes of an object when it is returned by any function. It
is something like the following:
$SomeObject->getObjectOne()->getObjectTwo()->callMethodOfObjectTwo();
The above ... just makes a completely new object, which
retains the properties of the object being copied. However, changing anything in the
new object will not affect the main object.
PHP5 is different...