5 programming-using-java intro-tooop20102011

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This document provides an introduction to object-oriented programming concepts like classes, objects, and methods in Java. It defines classes as templates that define attributes and behaviors of objects as variables and methods. Objects are instances of classes. The document explains how to declare a class with access modifiers, variables, constructors, and methods. It also demonstrates how to create objects using the new keyword and access object attributes and methods.

Using Java
MINISTRY OF EDUCATION & HIGHER EDUCATION
COLLEGE OF SCIENCE AND TECHNOLOGY
KHANYOUNIS- PALESTINE
Lecture 6
Introduction to classes and objects

 What is Object-Oriented Programming ?
 What classes, objects, methods ?
 How to declare a class ?
 How to use class to create an object?
 How to declare methods in a class ?
 Emank X Mezank
2Presented & Prepared by: Mahmoud R. Alfarra

 It is a whole new way of thinking about
programming!
 It is a way of modeling software that maps
your code to the real world.
 Now please, Look in this room …
3Presented & Prepared by: Mahmoud R. Alfarra
What is Object-Oriented Programming ?
Chair
Door
Man
Window
.
.
No. of legs
Material
Color
Size
Purpose
.
.
Abstraction
Encapsulation

4Presented & Prepared by: Mahmoud R. Alfarra
What is Object-Oriented Programming ?
Any Thing
Attributes
Behavior
Each one represented
by variable in class
Each one represented
by method in class

 The terms class and object are often
confused, and it is important to understand
the distinction.
 It may help you to visualize these terms using
the earlier racecar analogy.
 Think of a class as the template for the car, or
perhaps the plans used to build the car.
 The car itself is an instance of those plans, so
it could be referred to as an object.
5Presented & Prepared by: Mahmoud R. Alfarra
What are classes, objects ?

6Presented & Prepared by: Mahmoud R. Alfarra
Classes, Objects ?
Student
Student 120090234
Student 120090236
Student 120090238
Student 120090400
car
Car-AB-201
Car-AB-323
Car-BM-291
Objectsclasses

$ The behavior of the class will be represented as a method in class.  The method can be declared as: 7Presented & Prepared by: Mahmoud R. Alfarra What are methods ? Access_modifiers return_type method_name (arguments) { // instructions return value; }$

8Presented & Prepared by: Mahmoud R. Alfarra
What are methods ? (Example)
Public void add (int x, int y)
{
int sum = x + y;
}
Public int even (int x)
{
if (x%2 ==0)
return x;
else
{JOptionPane.showMessageDialog(null, "The value is not even ");
Return -1; }
}

$9Presented & Prepared by: Mahmoud R. Alfarra How to declare Class? Access_modifiers class class_name{ //variables declaration // constructor // methods } Public class Car{ public String model; public String ID; public int price; public Car (){ model = “Cevic”; ID = “20023456”; price= 12,000; // methods }$

10Presented & Prepared by: Mahmoud R. Alfarra
How to use class to create an object?
class_name obj_name = new constructor_name ();
Car c1 = new Car ();
Car c2 = new Car ();
Car c2 = new Car ();
c2.model = “Honda”;
c2.ID = “987435”;
c2.price = 4000;

‫تعاىل‬ ‫هللا‬ ‫قال‬:
(‫املنفوش‬ ‫كالعهن‬‫اجلبال‬ ‫تكون‬ ‫يوم‬)
11Presented & Prepared by: Mahmoud R. Alfarra

Equality and
Relational
Operators 12Presented & Prepared by: Mahmoud R. Alfarra

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A measles outbreak originating in West Texas has been linked to confirmed cases in New Mexico, with additional cases reported in Oklahoma and Kansas. The current case count is 795 from Texas, New Mexico, Oklahoma, and Kansas. 95 individuals have required hospitalization, and 3 deaths, 2 children in Texas and one adult in New Mexico. These fatalities mark the first measles-related deaths in the United States since 2015 and the first pediatric measles death since 2003. The YSPH Virtual Medical Operations Center Briefs (VMOC) were created as a service-learning project by faculty and graduate students at the Yale School of Public Health in response to the 2010 Haiti Earthquake. Each year, the VMOC Briefs are produced by students enrolled in Environmental Health Science Course 581 - Public Health Emergencies: Disaster Planning and Response. These briefs compile diverse information sources – including status reports, maps, news articles, and web content– into a single, easily digestible document that can be widely shared and used interactively. Key features of this report include: - Comprehensive Overview: Provides situation updates, maps, relevant news, and web resources. - Accessibility: Designed for easy reading, wide distribution, and interactive use. - Collaboration: The “unlocked" format enables other responders to share, copy, and adapt seamlessly. The students learn by doing, quickly discovering how and where to find critical information and presenting it in an easily understood manner.

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5 programming-using-java intro-tooop20102011

1. Using Java MINISTRY OF EDUCATION & HIGHER EDUCATION COLLEGE OF SCIENCE AND TECHNOLOGY KHANYOUNIS- PALESTINE Lecture 6 Introduction to classes and objects

2.  What is Object-Oriented Programming ?  What classes, objects, methods ?  How to declare a class ?  How to use class to create an object?  How to declare methods in a class ?  Emank X Mezank 2Presented & Prepared by: Mahmoud R. Alfarra

3.  It is a whole new way of thinking about programming!  It is a way of modeling software that maps your code to the real world.  Now please, Look in this room … 3Presented & Prepared by: Mahmoud R. Alfarra What is Object-Oriented Programming ? Chair Door Man Window . . No. of legs Material Color Size Purpose . . Abstraction Encapsulation

4. 4Presented & Prepared by: Mahmoud R. Alfarra What is Object-Oriented Programming ? Any Thing Attributes Behavior Each one represented by variable in class Each one represented by method in class

5.  The terms class and object are often confused, and it is important to understand the distinction.  It may help you to visualize these terms using the earlier racecar analogy.  Think of a class as the template for the car, or perhaps the plans used to build the car.  The car itself is an instance of those plans, so it could be referred to as an object. 5Presented & Prepared by: Mahmoud R. Alfarra What are classes, objects ?

6. 6Presented & Prepared by: Mahmoud R. Alfarra Classes, Objects ? Student Student 120090234 Student 120090236 Student 120090238 Student 120090400 car Car-AB-201 Car-AB-323 Car-BM-291 Objectsclasses

7.  The behavior of the class will be represented as a method in class.  The method can be declared as: 7Presented & Prepared by: Mahmoud R. Alfarra What are methods ? Access_modifiers return_type method_name (arguments) { // instructions return value; }

8. 8Presented & Prepared by: Mahmoud R. Alfarra What are methods ? (Example) Public void add (int x, int y) { int sum = x + y; } Public int even (int x) { if (x%2 ==0) return x; else {JOptionPane.showMessageDialog(null, "The value is not even "); Return -1; } }

9. 9Presented & Prepared by: Mahmoud R. Alfarra How to declare Class? Access_modifiers class class_name{ //variables declaration // constructor // methods } Public class Car{ public String model; public String ID; public int price; public Car (){ model = “Cevic”; ID = “20023456”; price= 12,000; // methods }

10. 10Presented & Prepared by: Mahmoud R. Alfarra How to use class to create an object? class_name obj_name = new constructor_name (); Car c1 = new Car (); Car c2 = new Car (); Car c2 = new Car (); c2.model = “Honda”; c2.ID = “987435”; c2.price = 4000;

11. ‫تعاىل‬ ‫هللا‬ ‫قال‬: (‫املنفوش‬ ‫كالعهن‬‫اجلبال‬ ‫تكون‬ ‫يوم‬) 11Presented & Prepared by: Mahmoud R. Alfarra

12. Equality and Relational Operators 12Presented & Prepared by: Mahmoud R. Alfarra

5 programming-using-java intro-tooop20102011

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