Basic Object-Oriented Approach
Jigar Jobanputra
Jigar Jobanputra(JJ)
Session Objectives
 Discuss the object oriented approach
 Discuss the drawbacks of traditional
programming
 Discuss obj...
The Object-Oriented Approach
PersonnelAccounts
Sales
The real world around is full of objects .We can consider both the li...
Drawbacks of Traditional
Programming
 Unmanageable programs
 Problems in modification of data
 Difficulty in implementa...
Object – Oriented
Programming
Data
Employee details
Salary statements
Bills
Vouchers
Receipts
Functions
Calculate salary
P...
Objects
Some real-life entities :
 Physical Objects
 Vehicles in a traffic -monitoring application
 Electrical componen...
Objects (contd…)
 Collections of data
 An inventory of machine parts
 A personnel file
 User defined data types
 Time...
Objects (contd…)
Model : Ferrari
Color : Red
Year : 1995
Actions
Start
Stop
Accelerate
Jigar Jobanputra(JJ)
Classes
A class is a group of objects that have the same properties, common behavior.
Polygon objects Polygon class
Proper...
Encapsulation
Encapsulation is a process that allows
selective hiding of properties and
methods in a class.
Not accessible...
Inheritance
Inheritance is the property that allows the reuse of an existing class to build a
new class
Animals
Jigar Joba...
Abstraction
Attributes
Methods
Class
Data abstraction is a process
of identifying properties and
methods related much to a...
Reusability
Make sounds
Eat and drink
Hunt prey
Mew
Drink milk
Hunt mice
Roar
Eat flesh
Hunt big game
Felines
Jigar Jobanp...
Polymorphism
Subclasses
Polymorphism allows same method to behave differently on different classes.
Class : Shape
Methods ...
Object – Oriented Languages
 C ++
 Small Talk
 Eiffel
 CLOS
 Java
Jigar Jobanputra(JJ)
The Problem with High Level
Language
P
R
O
B
L
E
M
Program
Applications
written for a
particular
platform will not
work on...
Java Language
 Java is a language from SUN Microsystems.
 Java uses an Interpreter to execute code so that it may run on...
Java Virtual Machine (JVM)
Source Code
Imaginary computer’s
instruction set
Compiler
Target Machine
Java Virtual Machine
F...
Life Cycle of a Java Program
Compiler Filename.class
Byte Code
Filename.java
Source Code
User
Code
Java Virtual Machine
Ji...
Execution procedure by the JVM
The Java Virtual Machine creates a runtime system
internally that helps the execution of co...
Java code and JVM
 All java programs are written keeping in mind the
Java VM.
 The Java source code and the byte code is...
First Program
class HelloJava
{
public static void main( String args[])
{
System.out.println(“Welcome to the
world of Java...
First Program [Contd…]
• Save the file as HelloJava.java
• Use the javac command to compile the
file HelloJava.java
• Exec...
Thank You
Jigar Jobanputra(JJ)
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Basic object oriented approach

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Basic object oriented approach

  1. 1. Basic Object-Oriented Approach Jigar Jobanputra Jigar Jobanputra(JJ)
  2. 2. Session Objectives  Discuss the object oriented approach  Discuss the drawbacks of traditional programming  Discuss object oriented programming  Discuss basic Object-Oriented concepts such as objects, classes, properties, methods, abstraction, inheritance, encapsulation, reusability and polymorphism.  Describe Java Virtual Machine  Write the First Java Program Jigar Jobanputra(JJ)
  3. 3. The Object-Oriented Approach PersonnelAccounts Sales The real world around is full of objects .We can consider both the living beings as well as non living elements as objects. For example, the different departments in a company are objects. Jigar Jobanputra(JJ)
  4. 4. Drawbacks of Traditional Programming  Unmanageable programs  Problems in modification of data  Difficulty in implementation Jigar Jobanputra(JJ)
  5. 5. Object – Oriented Programming Data Employee details Salary statements Bills Vouchers Receipts Functions Calculate salary Pay salary Pay bills Tally accounts Transact with banks Here the application has to implement the entities as they are seen in real life and associate their actions and attributes with each other. Accounts Jigar Jobanputra(JJ)
  6. 6. Objects Some real-life entities :  Physical Objects  Vehicles in a traffic -monitoring application  Electrical components in a circuit design problem  Elements of the computer-user environment  Windows  Menus An object is an element with defined boundaries that is relevant to the problem we are dealing with Jigar Jobanputra(JJ)
  7. 7. Objects (contd…)  Collections of data  An inventory of machine parts  A personnel file  User defined data types  Time  Angles  Complex numbers Jigar Jobanputra(JJ)
  8. 8. Objects (contd…) Model : Ferrari Color : Red Year : 1995 Actions Start Stop Accelerate Jigar Jobanputra(JJ)
  9. 9. Classes A class is a group of objects that have the same properties, common behavior. Polygon objects Polygon class Properties Vertices Border color Fill color Methods Draw Erase Move Jigar Jobanputra(JJ)
  10. 10. Encapsulation Encapsulation is a process that allows selective hiding of properties and methods in a class. Not accessible from outside class Accessible from outside class Private Public Jigar Jobanputra(JJ)
  11. 11. Inheritance Inheritance is the property that allows the reuse of an existing class to build a new class Animals Jigar Jobanputra(JJ)
  12. 12. Abstraction Attributes Methods Class Data abstraction is a process of identifying properties and methods related much to a particular entity as relevant to the application Jigar Jobanputra(JJ)
  13. 13. Reusability Make sounds Eat and drink Hunt prey Mew Drink milk Hunt mice Roar Eat flesh Hunt big game Felines Jigar Jobanputra(JJ)
  14. 14. Polymorphism Subclasses Polymorphism allows same method to behave differently on different classes. Class : Shape Methods : Draw Move Initialize Jigar Jobanputra(JJ)
  15. 15. Object – Oriented Languages  C ++  Small Talk  Eiffel  CLOS  Java Jigar Jobanputra(JJ)
  16. 16. The Problem with High Level Language P R O B L E M Program Applications written for a particular platform will not work on another platform S O L U T I O N Interpreter Interpreter Interpreter Program To solve this problem, we make use of interpreters So the code for any application can be written only once, which can then be executed with the help of Interpreters created for different platformsJigar Jobanputra(JJ)
  17. 17. Java Language  Java is a language from SUN Microsystems.  Java uses an Interpreter to execute code so that it may run on different computers without any change to the source code.  Java Programs are platform independent. Hence the code written in Java can be executed on different platforms.  Java is a program mainly used for Web based applications because of its support to different platforms.  Java is purely an Object Oriented Programming language. Jigar Jobanputra(JJ)
  18. 18. Java Virtual Machine (JVM) Source Code Imaginary computer’s instruction set Compiler Target Machine Java Virtual Machine For each computer, there is a unique Java Virtual Machine Machine language code Byte Code Jigar Jobanputra(JJ)
  19. 19. Life Cycle of a Java Program Compiler Filename.class Byte Code Filename.java Source Code User Code Java Virtual Machine Jigar Jobanputra(JJ)
  20. 20. Execution procedure by the JVM The Java Virtual Machine creates a runtime system internally that helps the execution of code by : Loading the “ . class ” files. Managing the memory. Performing Garbage collection. Jigar Jobanputra(JJ)
  21. 21. Java code and JVM  All java programs are written keeping in mind the Java VM.  The Java source code and the byte code is machine independent while JVM is machine dependant.  Different machines with different Operating system will require a JVM developed for that machine. Jigar Jobanputra(JJ)
  22. 22. First Program class HelloJava { public static void main( String args[]) { System.out.println(“Welcome to the world of Java”); } } Jigar Jobanputra(JJ)
  23. 23. First Program [Contd…] • Save the file as HelloJava.java • Use the javac command to compile the file HelloJava.java • Execute the bytecodes of HelloJava.class using the java command Jigar Jobanputra(JJ)
  24. 24. Thank You Jigar Jobanputra(JJ)

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