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

Comments

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

Sorting Algorithms

Bubble Sort Named as sinking sort. Compare each pair of the adjacent items and swap them if they are in the wrong order. Worst case and average case time complexity both O(n^2) and best case time complexity is O(n).

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 ...

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