Object-Oriented Programming: Understanding Objects and Classes, Study notes of Computer Networks

Download Object-Oriented Programming: Understanding Objects and Classes and more Study notes Computer Networks in PDF only on Docsity! 1 Java Programming Topic: Object & Class Theory ANIL SAROLIYA Amity School of Engineering B.Tech., CSE(5th Sem.) Objects  Following figure shows few entities and each of them can be treated as an object. So we can say, an object can be a person, a place, or a thing with which the computer must deal. 2  So, objects mainly serve the following purposes:  Understanding of the real world problem and give the practical base for designers  Decomposition of a problem into modules. Such decomposition is depends on the judgment and nature of the problem Classes Cont..  A class is a template (pattern) that unites data and operations.  A class is an abstraction of the real world entities with similar properties.  A class identifies a set of similar objects.  Ideally, the class is an implementation of abstract data type.  In C++ or JAVA, related objects displaying the same behavior are grouped and represented by class in the following way: 5 Example (C++ Class) Example (Java Class) class account { private: char Name(20]; int AccountType; // data members int AccountNumber; float Balance; public: Deposit(); Withdraw(); // member functions Enquire(); }; public class Account { private String name; private int accountType; // data Members private int accountNumber; private float balance; public int deposit(); public void withdraw(); //member functions public String enquire(); } C++ Object Creation JAVA Object Creation account savings_account; account current_account; account FD_account; Account savings_account = new Account(); Account current_account= new Account(); Account FD_account= new Account(); Advantages & Disadvantages of OOP’s 6 MERITS DEMERITS Supports Following: Encapsulation Data Abstraction Inheritance Polymorphism Related to Real world entity Compiler overhead Runtime overhead Re-orientation of software developer to object-oriented thinking Requires the mastery over the following areas: Software Engineering Programming Methodologies Benefits only in long run while managing large software projects Thanks 7 Amity School of Engineering & Technology B.Tech., CSE(5th Sem.)