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Object oriented concepts with java

This document discusses object-oriented programming concepts in Java. It explains that OOP languages like Java use classes that encapsulate attributes and behaviors, making code more reusable. Java is a platform-independent language that uses a virtual machine. Key OOP concepts in Java include objects, classes, abstraction, encapsulation, inheritance, and polymorphism. Objects are instances of classes, and classes define objects' data and methods. Abstraction hides details and shows functionality, while encapsulation binds code and data. Inheritance allows code reuse through parent-child class relationships. Polymorphism means the same tasks can be performed in different ways.

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Object Oriented Concepts With JAVA Mehta Ishani 2nd M.E.(C.S.E)
Why OOP? • Traditional Procedural-Oriented languages – difficult to copy a function from one program and reuse in another program because the the function is reference the headers, global variables and other functions. (i.e. not well-encapsulated as a self-contained reusable unit.) – not suitable of high-level abstraction for solving real life problems.
Why OOP? • Object-oriented programming (OOP) languages – class, which encapsulates both the static attributes and dynamic behaviors (i.e. well- encapsulated, easier to reuse) – permit higher level of abstraction for solving real-life problems
Benefits of OOP • Ease in software design • Ease in software maintenance • Reusable software
What is JAVA? • programming language expressly designed for use in the distributed environment of the Internet • Simple, Secure, Robust, Complete Object Oriented and Platform Independent High level Language. • It is portable and Multi-thread technology gives High performance.
JAVA Hardware Platform Java Platform Software (OS) Platform Operates and Controls H/W Environment for Java Development JVM API
JAVA How it Works:
JAVA Java Program Virtual Machine Source code Bytecode Java Compiler Process of Compilation: Java Interpreter Virtual Machine Real MachineBytecode
Object • real word entity that has state and behavior • contains data (instance variables) representing its state, and instance methods, which are the things it can do. • instance of a class
Class • Collection of objects • template, blueprint or contract that defines what an object’s data fields and methods will be.
Abstraction • Hiding internal details and showing functionality • In java, we use abstract class and interface to achieve abstraction.
Encapsulation • Binding (or wrapping) code and data together into a single unit • A java class • Java bean
Inheritance • When one object acquires all the properties and behaviors of parent object • provides code reusability. • Used to achieve runtime polymorphism.
Inheritance A B C A B C A-1 A-2 B-1 B-2 AB Multi-level Inheritance Multiple Inheritance Multiple Multi-level Inheritance Types of Inheritance:
Ploymorphism • "Poly" means "many" and "morph" means "form". • When one task is performed by different ways
Polymorphism • same word or symbol to be interpreted correctly in different situations based on the context • There are two types of polymorphism : 1.Compile-time polymorphism (Method Overloading/Static) 2.Runtime Polymorphism (Method Overriding/Dynamic)
Ploymorphism Method Overloading: having multiple methods with same name but with different signature (number, type and order of parameters). Method Overriding: When a subclass contains a method with the same name and signature as in the super class then it is called as method overriding.
Summery • An object is an instance of a class. • Using abstraction one can simulate real world objects. • Abstraction provides advantage of code reuse • Abstraction enables program open for extension • Encapsulation provides the security that keeps data and methods safe from inadvertent changes. • Inheritance is parent-child relationship of class which is mainly used for code reusability. • Polymorphism definition is that Poly means many and morphos means forms.
Object oriented concepts with java