intoduction to java

1. 3) Enterprise Application

   An application that is distributed in nature, such as banking applications etc. It has the advantage of high level security, load balancing and clustering. In java, EJB is used for creating enterprise applications.

   4) Mobile Application

         An application that is created for mobile devices. Currently Android and Java ME  are used for  creating                mobile applications.

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java introduction

INTRODUCTION TO JAVA

Java technology is widely used currently. Let's start learning of java from basic questions like what is java, where it is used, what type of applications are created in java and why use java?

What is Java?

java is a programming language and a platform.

Platform Any hardware or software environment in which a program runs, known as a platform. Since Java has its own Runtime Environment (JRE) and API, it is called platform.

Where it is used?

According to Sun, 3 billion devices run java. There are many devices where java is currently used. Some of them are as follows:

1. Desktop Applications such as acrobat reader, media player, antivirus etc.
2. Web Applications such as irctc.co.in, onlinesbi,redbus.
3. Enterprise Applications such as banking applications.
4. Mobile
5. Embedded System
6. Robotics
7. Games etc.

   Types of Java Applications

   There are mainly 4 type of applications that can be created using java:

   1) Standalone Application

   It is also known as desktop application or window-based application. An application that we need to install on every machine such as media player, antivirus etc. AWT and Swing are used in java for creating standalone applications.

   2) Web Application

   An application that runs on the server side and creates dynamic page, is called web application. Currently, servlet, jsp, struts, jsf etc. technologies are used for creating web applications in java.

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Basic Operations to performed in java application

Using only programming language we performs three operations in developing logic.

1. Reading and Storing input data.
2. Doing calculations for modifying data and generating output.
3. Controlling modifications.
4. Storing output permanently or printing it on console.

To perform first three operations every programming language contains three concepts.

1. Datatypes: used to store data temporarily.
2. Operations: For doing calculations.
3. Control Statements: Used for validating and controlling modifications.

In edition 2 above three concepts we also has more concepts to perform below tasks.

1. Reading input values from end user : IO Streams/ AWT.
2. Sending multiple values at a time to another application : Arrays and Collections .
3. Processing all requests at a time concurrently : Multi Threading .
4. Handling user mistakes and user understandable message : Exception Handling.
5. Sending and Reading data from Networking : Networking.
6. Storing data or output permanently : IO Streams and JDBC.
7. Executing logic in server system via web protocol : Servlets or JSP.
8. Executing logic in server system via distributed protocols : RMI and EJB.
9. Organizing logic Development by making it reusable from multiple applications by writing single program to execute method from different sub classes of an object : OOPS , LCRP , MVC.

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introduction to Java Language

·        
Java is a programming language.

·         platform and technology ,it has syntax's to develop program,so it is language.

·         It has it's own Environment to execute java program i.e JVM (Java Virtual Machine) so is is Platform.

·         It has Ready made code to develop programs for reading data from network and storing data permanently in data base so it is Technology.

·         Servlets ,Jsp, for Reading data from Network down.

·         JDB,EJB for storing data in database permanently.

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