abhijitramesh / carl

This repository will contain my revision notes and programs on Java

Carl

Carl is a hedgehog. Yes that is it, Carl is a hedgehog for more information on Carl contact https://github.com/vaishnav04 But instead if you want to know more Java Keep Reading and Enjoy 😃

Introduction

What is object oriented programming

Object oriented programing is used for expressing real-world objects in programming concepts like objects and classes and also to take advantage of features like

• Inheritance
• Polymorphism
• Abstraction
• Encapsulation

Difference between classes and objects

Classes	Objects
A Class is a template or blueprint from which objects are created	An Object is an instance of a class
A Class is declared once	An Object can be created anynumber of times
Class does not allocate memory when it is created	An Object takes up memory when they are created

What is Inheritance ?

Inheritance is the property by which a class or an object can acquires all the properties of the Parent class or object.

What is Polymorphism ?

Polymorphism means performing a task in different ways. There are two types of Polymorphism in java

1. Compile-time Polymorphism
2. Run-time Polymorphism

What is an Abstraction ?

Abstraction is the process of hiding the implementation of a class from a user and only shows the required data.

What is Encapsulation ?

The process of wrapping up of the code into a single unit is called Encapsulation.

Naming Conventions in Java

Classes

While naming Classes it is always recomeneded to start with capital letter. Nouns are given the names for Classes and it should be an apropriate word rather than acronyms.

Interface

While naming Interfaces it should always start with capital letter. It should always be an adjective and should be an aproprate word rather than an acronym.

Methods

While naming Methods it should always start with small letter. It should alwaus be a verb.If it contains more than one world the starting of the second word could be Capitalized. example: actionPerformed()

Variables

Variable names should always start with small letters. There should not be any special characters while naming a variable. Naming a variable as x,y,z is not recommended it is better to use something like name, address etc....

Packages

Pacakage names should be lowercase words and each word should be seperated by a dot(.).

Constants

Constants should be named in all caps, example PI. If there are more than one word it is recommended to use and _ to seperate them example THE_VALUE_OF_PI.