Object Oriented Programming (OOP)

Object

Object is an entity that has state and behavior

Class

Collection of objects is known as class.

There are four main types of OOP concepts

Inheritance

Object acquire all the properties and behavior of parent object
Improve code re-usability

Polymorphism

One task is performed by different ways
Use method overload and override

Abstraction

Hiding internal details and showing functionality
Use abstract class and interfaces

Encapsulation

Binding code and data into a single unit

Comments

Java-8

Java 8 New Features There are several new features added in Java 8 version. Some of the important new features are: Define methods inside the interface For each method Lambda Expression Stream API DateTime API 1) Define methods (default, static) inside the Interface After you published your interface, you can't change it by adding some abstract methods. But if you want to add methods you can define those methods inside the interface. Therefore Java 8 support default and static methods inside the interface. In Java 7 version interface only have abstract methods (no method implementation) and an abstract class can have both abstract and non-abstract methods. In Java 8 version you can add method implementation in the interface, but you have to declare that method as default method. ex: default void show(){............} To avoid diamond problem you have to override the method in implementation class if two interfaces have same default method ...

Model-View-Controller (MVC)

MVC(Model-View-Controller) is a software design pattern.It divided your applications into three components Model: Contain business rules and application Data View: Presentation layer (user interface) Controller: Handles the communication between view and model Objectives of MVC Promote code usability Implement separation of concerns Separate user interface and software logic Web Frameworks That Use MVC There are several web frameworks that use MVC design pattern. Ruby On Rails (Ruby) Angular (JS) Django (Python) Express (JS) Flask (Python) Codeigniter (PHP) Simple UseCase for MVC In this use case scenario, Browser sends information that needs to create Employee Object, and Controller save that information in Model and Update the Employee View. Following Image shows the class diagram for above Scenario. Implementation: https://github.com/kaosadi17/MVC

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