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.
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