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 what is java

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  • Java is a general purpose programming language and a platform.
  • It is a high level, robust, secured and object-oriented programming language.
  • Platform: Any hardware or software environment in which a program runs is called a platform.
  • Since Java has its own runtime environment (JRE) and API, it is known as platform.
 What is Java

Learn Java - Java tutorial - What is Java - Java examples - Java programs

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Sample Code

public class Simple{  
    public static void main(String args[]){  
     System.out.println("Hi Welcome to Wikitechy!!!To Learn Java Tutorial");  
    }  
}  
click below button to copy the code. By - java tutorial - team

Output

Hi Welcome to Wikitechy!!!To Learn Java Tutorial

Where it is used?

  • There are several devices where Java used currently. Some of them are as follow:
    • Desktop Applications (for example: acrobat reader, media player, and antivirus)
    • Web Applications (for example: irctc.co.in and wikitechy.com)
    • Enterprise Applications (for example: banking applications)
    • Mobile
    • Embedded System
    • Smart Card
    • Robotics
    • Games

Types of Java Applications

  • There are four types of Application,

Standalone Application

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

Web Application

  • An application that runs on server side and creates dynamic page, is known as web application.
  • At present, servlet, jsp, jsf, struts technologies are used for creating web applications in java.

Enterprise Application

  • An application that is distributed in nature (banking applications)
  • The Enterprise Application has the benefit of high level security, load balancing and clustering. Java EJB (Enterprise Java Bean) is used for creating enterprise applications.

Mobile Application

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

Java Platforms / Editions

  • There are four platforms or editions of Java:
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Java SE (Java Standard Edition)

  • The Java SE is a java programming platform.
  • It includes Java programming APIs such as java.lang, java.io, java.net, java.util, java.sql, java.math etc.
  • It includes core topics like OOPs, String, Regex, Exception, Inner classes, Multithreading, I/O Stream, Networking, AWT, Swing, Reflection, and Collection etc.

Java EE (Java Enterprise Edition

  • Java EE is an enterprise platform which is primarily used to develop web and enterprise applications.
  • It is built on the top of Java SE platform. It includes topics like Servlet, JSP, Web Services, EJB, JPA etc.

Java ME (Java Micro Edition)

  • The Java ME is a micro platform which is mainly used to develop mobile applications.

JavaFx

  • The JavaFx is used to develop rich internet applications. It uses light-weight user interface API.

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