Java Introduction

What is a Java

Java is a programming language. Java is a High level, robust secured and Object-Oriented Language

Platform: Any hardware or software environment which a program runs is known as platform.

Java has a programming language

• The java programming language is a high-level,object-oriented and general purpose computer programming language.
• You can use java to write computer applications that play games,store data or do any of the thousands of other things computer software can do.

Where is java used
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. Mobile.
3. Embedded System.
4. Enterprise Applications such as banking Applications.
5. Web Applications such as irctc.co.in.
6. Smart Card.
7. Robotics.
8. Games etc.

Types of Java Applications

By using java mainly we create 4 types of applications.

1. Standalone Application : It is also know as window based or Desktop Applications .An application that we need to install on every machine such as media player,antivirus,etc.
2. Web Application:An Application that runs on server side and creates a dynamic page that is Web Applications.
3. Enterprise Application:An Application that is distributed in nature is know as Enterprise Applications such as Banking.
4. Mobile Application:An application that is created for mobile devices.

History Of Java

Java was developed by Sun Micro systems in theearly to mid 1990 and development continues to this day.

1990: A team headed by James Gosling i set up to work on a programming language for consumer electronic devices.

1992: The team creates a project called star7(*7) and personal, hand-held remote control. The development team s incorporated as a First person,inc.

1994:the team notices the popularity of the web which came along in 1993 and builds first web-enabled browser.

1995: May 23 At sun world in san Francisco Sun Micro Systems,inc. formally announces Java 1.0 and Netscape also announces   it will license Java for its browser. 

Java Version History

1. JDK Alpha and Beta(1995)
2. JDK 1.0(23 rd Jan 1996)
3. JDK1.1(19 th Feb 1997)
4. J2SE1.2(8 th Dec 1998)
5. J2SE 1.3 (8th May 2000)
6. J2SE1.4 (6 th Feb 2002)
7. J2SE 5.0(30 th sep 2004)
8. JAVA SE6(11 th Dec 2006)
9. JAVA SE7(28 th July 2011)
10. JAVA SE8(18 th March 2014)

Features of Java Programming Language

Simple

• Java is Easy to write and more readable and eye catching.
• Java has a concise,cohesive set of features that makes it easy to learn and use.
• Most of the concepts are drew from c++ thus making java learning simpler.

Secure:

• Java provides secure way to access the web applications.
• java provides a secure means of creating internet applications.

Portable:

• Java program can execute in any environment for which there is a java run time system(JVM)
• Java program runs any platform
• Java programs can be transferred  over world wide web(e.g. applet).

Object-Oriented:

• Java program is Object-oriented programming language.
• Java is pure OOP. Language.

Robust:

• Java encourages error-free programming by being strictly typed and performing run-time checks.

Multi threaded:

• Java provides integrated support for multi thread programming.

High Performance:

• Byte codes are highly optimized. JVM can executed them much faster.

Dynamic:

• Java programs carry with them substantial amounts of run time information that is used to verify and resolve access to objects at run time.

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