Oops concepts in java with examples pdf


 

4 days ago Learn concept of Object Oriented Programming(OOP) in java with example. Know about Abstraction, Encapsulation, Inheritance, Polymorphism. Java OOPs concepts - In this guide, we will discuss features of Object Oriented Programming System(OOPs) and how they are used in java with examples. Can We Downlode PDF file of this OOP Concept, Please forward the Link if possible. concepts or real world entities as objects with approved interfaces for use by you will walk through object-oriented programming by example; learning to use a .

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Oops Concepts In Java With Examples Pdf

An object in OOP has some state and behavior. In Java, the state is the set of values of an object's variables at any particular time and the behaviour of an object. Java OOPs Concepts, OOPs, (Object-Oriented Programming), procedure- oriented vs object-oriented, java oops concept with examples, oops features, object. complete source code for all examples in this tutorial series, plus exercises “ Object-oriented programming is an exceptionally bad idea which could only have .

It is the mechanism in java by which one class is allow to inherit the features fields and methods of another class. Important terminology: Super Class: The class whose features are inherited is known as superclass or a base class or a parent class. Sub Class: The class that inherits the other class is known as subclass or a derived class, extended class, or child class. The subclass can add its own fields and methods in addition to the superclass fields and methods. By doing this, we are reusing the fields and methods of the existing class. The keyword used for inheritance is extends. It is the mechanism that binds together code and the data it manipulates. Other way to think about encapsulation is, it is a protective shield that prevents the data from being accessed by the code outside this shield. Technically in encapsulation, the variables or data of a class is hidden from any other class and can be accessed only through any member function of own class in which they are declared. As in encapsulation, the data in a class is hidden from other classes, so it is also known as data-hiding. Encapsulation can be achieved by: Declaring all the variables in the class as private and writing public methods in the class to set and get the values of variables. Abstraction : Data Abstraction is the property by virtue of which only the essential details are displayed to the user. The trivial or the non-essentials units are not displayed to the user. Ex: A car is viewed as a car rather than its individual components.

OOPS Concepts in Java - OOPS Concepts Example - JournalDev

If you delete the parent object, all the child objects will be deleted automatically. Advantage of OOPs over Procedure-oriented programming language 1 OOPs makes development and maintenance easier, whereas, in a procedure-oriented programming language, it is not easy to manage if code grows as project size increases. We can provide the solution of real word problem if we are using the Object-Oriented Programming language. What is the difference between an object-oriented programming language and object-based programming language?

Object-based programming language follows all the features of OOPs except Inheritance.

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JavaScript and VBScript are examples of object-based programming languages. Do You Know? Can we overload the main method?

Object Oriented Programming (OOPs) Concept in Java

A Java Constructor returns a value but, what? Can we create a program without main method? What are the six ways to use this keyword? Why is multiple inheritance not supported in Java?

Why use aggregation?

OOPS Concepts in Java with Examples

Can we override the static method? What is the covariant return type? What are the three usages of Java super keyword? Why use instance initializer block? What is the usage of a blank final variable?

What is a marker or tagged interface? What is runtime polymorphism or dynamic method dispatch? What is the difference between static and dynamic binding? How downcasting is possible in Java? What is the purpose of a private constructor? What is object cloning? What will we learn in OOPs Concepts? Advantage of OOPs. A class can only extend subclass one parent.

Interfaces if any : A comma-separated list of interfaces implemented by the class, if any, preceded by the keyword implements. A class can implement more than one interface.

A typical Java program creates many objects, which as you know, interact by invoking methods. An object consists of : State : It is represented by attributes of an object. It also reflects the properties of an object. Behavior : It is represented by methods of an object. It also reflects the response of an object with other objects.

Identity : It gives a unique name to an object and enables one object to interact with other objects. Example of an object : dog Method : A method is a collection of statements that perform some specific task and return result to the caller. A method can perform some specific task without returning anything.

Methods allow us to reuse the code without retyping the code. Methods are time savers and help us to reuse the code without retyping the code.

Method Declaration In general, method declarations has six components : Modifier-: Defines access type of the method i. In Java, there 4 type of the access specifiers. We can achieve encapsulation in Java by: Declaring the variables of a class as private. Providing public setter and getter methods to modify and view the variables values. We have then created a getter and setter methods through which we can get and set the name of an employee.

Through these methods, any class which wishes to access the name variable has to do it using these getter and setter methods. Object Oriented Programming : Abstraction Abstraction refers to the quality of dealing with ideas rather than events.

It basically deals with hiding the details and showing the essential things to the user. If you look at the image here, whenever we get a call, we get an option to either pick it up or just reject it.

But in reality, there is a lot of code that runs in the background. Therefore, abstraction helps to reduce complexity. Now what does the abstract keyword mean? If a class is declared abstract, it cannot be instantiated, which means you cannot create an object of an abstract class. Also, an abstract class can contain abstract as well as concrete methods.

In an interface, each method is public and abstract but it does not contain any constructor. So an interface basically is a group of related methods with empty bodies.

But their working is going to be different. Therefore, not all my subclasses have the same logic written for change gear. But suppose, someone else is driving a super car, where it increment by 30kms or 50kms. Again the logic varies. Similarly for applybrakes, where one person may have powerful brakes, other may not. After that, I will create a child class which implements this interface, where the definition to all these method varies.

SpeedUp ; A6.

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