Polymorphism in oop

Computer Science Faculty/Kabul University
Polymorphism in Object Oriented Programming (OOP)
Polymorphism in OOP
Supervisor: Prof. Abdul Rahman Mujadadi
Presentor: M. Mustafa Ibrahimy
18, Oct, 2017

Contents
• Introduction
• What is Polymorphism?
• Advantages & Disadvantages
• Types of Polymorphisms
• Conclusion
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Aim of Today’s Seminar
• To introduce polymorphism in OOP
3

4
- It is one of the important concept of OOP
- With polymorphism can design, implement
systems which are extensible.
- New classes can be added with little or without
modification in general portions of the program
[3].
Introduction

What is Polymorphism?
Definitions:
• The process of representing one form in multiple
forms is known as Polymorphism [2].
• The ability to take more than one form is called
polymorphism [1].
• Polymorphism is derived from 2 Greek
words: poly and morphs. It means many
forms[2].
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Real life example of polymorphism
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[2]

Important PointsAbout Polymorphism
• The behavior depends on the type of data used in
the operation
• Polymorphism is used for implementing
inheritance. [4]
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Advantages Of Polymorphism
• It helps programmers reuse the code and classes
once written, tested and implemented. They can be
reused in many ways.
• Single variable name can be used to store variables
of multiple data types(Float, double, Long, Int
etc) [5].
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Disadvantages Of Polymorphism
• developers find it difficult to implement
polymorphism in codes.
• Polymorphism reduces the readability of the
program [5].
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Types of Polymorphism
Polymorphism is divided into two types:
1) Method overloading (compile time)
It is also known as Static binding, Early binding
2) Method overriding (run time)
It is also known as Dynamic binding, Late binding.
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Continue…
Static binding: happens at compile time
Dynamic binding: happens at runtime
Dynamic Binding: is the process of linking
procedure call to a specific sequence of code
(method) at run-time. It means that the code to be
executed for a specific procedure call is not known
until run-time [5].
11

Method Overloading
• In method overloading, a class has multiple
methods with same name but different
parameters.
• We can achieve method overloading by changing
parameter types or by changing the number of
parameters [4].
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Method overloading -Example
public class OverLoading {
static class Mthdoverloading {
void test() {
System.out.println("No parameters");
}
//Overload test for one integer parameter.
void test(int a) {
System.out.println("a: "+a);
}
//Overload test for two integer parameters.
void test(int a, int b) {
System.out.println("a and b: " + a + " " +b);
}
} 13

Continue…
public static void main(String[] args) {
Mthdoverloading ob= new
Mthdoverloading();
ob.test();
ob.test(10);
ob.test(10,20);
}
}
Output:
No parameters
a: 10
a and b: 10 20
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Method Overriding
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• In method overriding, super class and sub
class having methods with same name and
same parameters but having different
implementations [4].

Method Overriding -Example
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public class Overriding {
static class Animal {
public void move() {
System.out.println("Animals can move");
}
}
static class Dog extends Animal {
@Override
//invokes the super class method
System.out.println("Dogs can walk and run");
}
}

Continue…
17
static class Bird extends Animal {
@Override
//invokes the super class method
System.out.println("Birds can fly");
}
}
public static void main(String[] args) {
Dog obj = new Dog();
obj.move();
Bird b = new Bird();
b.move();
}
}
Output:
Dogs can walk and run
Birds can fly

Conclusion
Polymorphism:
- An important OOP concept
- Act differently under different context.
Method overloading increases the readability of the
program.
Method overriding is used to achieve run-time
polymorphism.
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References
[1] T.P, Abbas. (2010). Data Structures & OOP Using C++,
Kerala: Calicut University Central Co-operative Store
[2] Kumar, Hitesh.(2013). Java Polymorphism. Retrieved 2017,
Oct 14, from https://www.sitesbay.com
[3] Oruji, Amin.(2013, December). OOP-Polymorphism.
Retrieved 2017, Oct 14, from https://www.oruji.org
[4] Christensson, P. (2007, November 2). OOP Definition.
Retrieved 2017, Oct 14, from https://techterms.com
[5] Sparrow, Penna.(2010, June). OOP-Polymorphism.
Retrieved 2017, Oct 17, from http://www.ianswer4u.com
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Any Question
Thanks
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Polymorphism in oop

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