Advance Java guide for fresher

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Advance Java guide for Fresher
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What is Java?

• Java is a computer programming language that is
  concurrent, Class-based, object-oriented
• It is intended to let application developers"
  Write code once and you can run it many times"
• Java is the Internet programming language
• One of the most popular programming languages in
  use, particularly for client-server web
  applications.

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Java Version History

• There are many java versions that has been
  released. Current stable release of Java is Java
  SE 8.

• 1. JDK Alpha and Beta (1995)
• 2. JDK 1.0 (23rd Jan, 1996)
• 3. JDK 1.1 (19th Feb, 1997)
• 4. J2SE 1.2 (8th Dec, 1998)
• 5. J2SE 1.3 (8th May, 2000)
• 6. J2SE 1.4 (6th Feb, 2002)
• 7. J2SE 5.0 (30th Sep, 2004)
• 8. Java SE 6 (11th Dec, 2006)
• 9. Java SE 7 (28th July, 2011)
• 10. Java SE 8 (18th March, 2014)

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Java Technology

• What is Java?

• Java technology is both a programming language
  and platform.
• The Java programming language
• The Java programming language is a high-level
  language
• that can be characterized by all of the
  following buzzwords
• Simple Architecture
  neutral
• Object oriented - High
  performance
• Distributed - Robust
• Multithreaded - Portable
• Dynamic - Secure

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Java platform

• A platform is the hardware or software
  environment in which a program runs. Some of the
  most popular platforms are Microsoft,Linux,Solaris
  OS, and Mac OS. The Java Platform differs
  form most other
• platforms in that it's a software-only platform
  that runs on top of
• other hardware-based platforms

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Different Editions of Java

• Java Enterprise Edition(J2EE)
• J2EE can be used to develop server-side
  application such as Java servlets, Java Server
  Page, and Java Server Faces.
• Java Micro Edition(J2ME)
• J2ME can be used to develop applications for
  mobile devices such as cell phones.
• Java Standard Edition(J2SE)
• J2SE can be used to develop client-side
  standalone applications or
• applets

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What are Servlets?

• The Servlet is server-side programming language
  class used for making dynamic web pages. They
  reside within a servlet engine
• Servlets receive and respond to requests from Web
  client, usually across HTTP, the Hypertext
  Transfer Protocol
• They provide concurrency, portability and
  Efficiency

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Benefits of Java servlets

• Performance
• The performance of servlets is superior to CGI
  because there is no process creation for each
  client request.
• Each request is handled by the servlet container
  process.
• After a servlet has completed processing a
  request, it stays resident in memory, waiting for
  another request.
• Rapid development cycle
• As a Java technology, servlets have access to the
  rich Java library that will help speed up the
  development process.

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Benefits of Java servlets

• Portability
• Like other Java technologies, servlet application
  are portable.
• Widespread acceptance
• Java is a widely accepted technology
• Robustness
• Servlets are managed by the Java Virtual Machine.
• Don't need to worry about memory leak or garbage
  collection, Which helps you write robust
  application.

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Disadvantages of Java

• Performance  
• Significantly slower and more memory-consuming
  than natively compiled languages such as C or
  C.
• Look and feel
•  The default look and feel of GUI applications
  written in Java using the Swing toolkit is very
  different from native applications.
• Single-paradigm language  
• The addition of static imports in Java 5.0 the
  procedural paradigm is better accommodated than
  in earlier versions of Java

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