Java

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Power Point Presentation on Topic JAVA
Submitted by Himani Kathal
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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 (which is
  now the subsidiary of Oracle) in the year 1995.
• Java is platform-independent that means java code
  can be compiled on any operating system and made
  to run on the same or any other operating system.
• Java supports concurrency which means the code
  can be executed by multiple processes at the same
  time.
• Java is class-based and object-oriented.

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Why do we use java?

• Simplicity Java was developed keeping in mind
  the complexities in other programming languages
  like C or C.
• Portability As already covered java source code
  can be developed and compiled on one machine and
  can be made to run on the same or any other
  operating system.
•  Object-Oriented In java, everything is treated
  as an object and all the operations involved in
  application development are completed using these
  objects.
• Dynamic Capability Applications developed using
  java can adapt them to changing execution
  environment.

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• High Security In terms of security java is
  operated on byte code which is not readable in
  nature. It runs source code inside a secured
  sandbox and does not allow any external
  intervention.
• Robust Java is developed keeping in mind all
  possibilities, and therefore there is no
  existence of the error.
• Multithreading Java supports creating multiple
  threads for execution thus providing high
  performance.
• Interpreted The code is converted into byte code
  which in turn is interpreted by java run time
  environment.
• Performance Java provides high performance as it
  makes use of byte code which can be translated
  into machine code with ease and with high speed.

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What can we do with Java?

• Banking and Financial Domain  Banking domain
  makes use of java for handling transactions. It
  performs exceptionally well while handling
  millions of transactions in an efficient way.
• Web Application Development This refers to
  website development. In web application
  development java provides server-side
  technologies that receive data from front end
  user interfaces and provide data to back end
  logical processing layer and after processing
  data is returned to front end through these
  server-side technologies.

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• Gaming Applications It has the support of one of
  the most popular 3D-Engine,which can be used to
  design three-dimensional games.
• Android Application Development Java is also
  used for the development of android applications.
  Android applications are developed using java
  API.
• Desktop Applications It is also used to develop
  standalone desktop applications. It has Abstract
  Windowing Toolkit (AWT) to allow GUI development.
• Big Data Map-reduce framework for handling big
  data processing is written in java.
• Cloud Applications It provides features that can
  be used to build applications used in Saas, Paas
  and Iaas cloud development.

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What are the applications of Java?

• Desktop GUI Application
• The desktop application can easily develop in
  Java, to support this java provides AWT,
  Swings, and JavaFX.
• Scientific Application
• Java supports to scientific application
  development, because of its security powerful,
  robustness features, much scientific application
  based on Java technology like MATLAB.
• Enterprise Applications
• For Enterprise application development Java is
  the first choice because of its powerful features
  that match the requirement
•  

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• Web Applications
• Java used to develop web application  also to
  support the java has provided JSP, Servlet,
  Struts, Spring, hibernate. With the help of the
  technologies, we can easily develop any kind of
  web application based on customer requirements.
• Mobile Applications
• A mobile application can easily be developed
  with help of java. In Todays world, every second
  phone has an android OS which is based on Java.

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How to run and execute program in Java?

• Code
• class Simple
•   
•     public static void main(String args)
•   
•       System.out.println("Hello Java")  
•       
•   
• Output
• Hello Java

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• To compile
• javac Simple.java
• To execute
• java Simple
• To save file
• .java extension is used.

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What are the parameters used in Java program?

• class keyword is used to declare a class in java.
• public keyword is an access modifier which
  represents visibility. It means it is visible to
  all.
• static is a keyword. If we declare any method as
  static, it is known as the static method. The
  core advantage of the static method is that there
  is no need to create an object to invoke the
  static method. The main method is executed by the
  JVM, so it doesn't require to create an object to
  invoke the main method. So it saves memory.
• void is the return type of the method. It means
  it doesn't return any value.

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• main represents the starting point of the
  program.
• String args is used for command line argument.
  We will learn it later.
• System.out.println() is used to print statement.
  Here, System is a class, out is the object of
  PrintStream class, println() is the method of
  PrintStream class.