EXPLAIN KEYS AND TYPES OF KEYS IN DBMS

In this articles we wil learn about : -

1.What is Java ?

2.It's Application.

3.Types of Java Applications.

4.Java Platforms / Editions

5.Prerequisite

What is Java

•Java is a programming language and a platform. Java is a high level, robust, object-oriented and secure programming language.

•Java was developed by Sun Microsystems in 1995. James Gosling is known as the father of Java. Before Java, its name was Oak. Since Oak was already a registered company, so James Gosling and his team changed the Oak name to Java.

•Java is a plateforn independent because it is known as “wright once and run anywhere”.

• Plate form independent means that once, you have compiled a Java program,then you can execute that program on any platform.

 Platform: Any hardware or software environment in which a program can be runs, is known as a platform. Since Java has a runtime environment (JRE) and API(Application programming interface).

  Java Example

  class Simple{  

      public static void main(String args[])

  {  

       System.out.println("Hello world");  

      }  

  }  

Application of java 

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

üDesktop Applications (such as acrobat reader, media player, antivirus, etc.)

üWeb Applications (such as irctc.co.in etc.)

üEnterprise Applications (such as banking applications.)

üMobile phones

üEmbedded System

üSmart Card

üRobotics

üGames, etc.

Types of Java Applications

There are mainly four types of applications that can be created using Java programming : -

 

1) Standalone Application : Standalone applications are also known as desktop applications or window-based applications. These are traditional software that we need to install on every machine. Examples of standalone application are Media player, antivirus, etc.

 

2) Web Application : Web application is an application that runs on the server side and creates a dynamic page. Currently, Servlet, JSP, Struts, Spring, Hibernate, JSF, etc technologies are used for creating web applications in Java.

 

3) Enterprise Application : Enterprise Application is an application that is distributed in nature, such as banking applications, etc is called enterprise application. It has advantages of the high-level security, load balancing, and clustering. In Java, EJB is used for creating enterprise applications.

 

4) Mobile Application : Mobile application is an application which is created for mobile devices is called a mobile application. Currently, Android and Java ME are used for creating mobile applications. 

Java Platforms / Editions

There are 4 platforms or editions of Java :-

 

1.JSE (Java Standard Edition) : It 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, Collection, etc.

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2. JEE (Java Enterprise Edition) : It is an enterprise platform which is mainly used to develope web and enterprise applications. It is built on the top of the Java standard edition (JSE) platform. It includes topics like Servlet, JSP, Web Services, EJB, JPA, etc.

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3. JME (Java Micro Edition) : It is a micro platform which is mainly used to develope mobile applications.

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4. JavaFX : It is used to develope rich internet applications. It uses a light-weight user interface API.

 

Prerequisite

•To learn Java, you must have the basic knowledge of C/C++ programming language.

•In upcomming lectures we will learn about…

•History of Java

•Java Version

•Why Java named "Oak"?

•Why Java Programming named "Java"?

•Thanks for reading this articles