What is Java Programming ?

Java is a widely-used programming language for coding web applications. It has been a popular choice among developers for over two decades, with millions of Java applications in use today. Java is a multi-platform, object-oriented, and network-centric language that can be used as a platform in itself. It is a fast, secure, reliable programming language for coding everything from mobile apps and enterprise software to big data applications and server-side technologies. Created in 1995.

Uses of Java

• Java works on different platforms (Windows, Mac, Linux, Raspberry Pi, etc.)
• It is one of the most popular programming language in the world
• It has a large demand in the current job market
• It is easy to learn and simple to use
• It is open-source and free
• It is secure, fast and powerful
• It has a huge community support (tens of millions of developers)
• Java is an object oriented language which gives a clear structure to programs and allows code to be reused, lowering development costs
• As Java is close to C++ and C#, it makes it easy for programmers to switch to Java or vice versa

Java Virtual Machine (JVM)

JVM (Java Virtual Machine) is an abstract machine. It is a specification that provides runtime environment in which java bytecode can be executed. JVMs are available for many hardware and software platforms (i.e. JVM is platform dependent).

Operations

• Loads code
• Verifies code
• Executes code
• Provides runtime environment
• JVM provides definitions for the :
  1. Memory area
  2. Class file format
  3. Register set
  4. Garbage-collected heap
  5. Fatal error reporting etc.

Basic Code

   class Simple{  
    public static void main(String args[]){  
     System.out.println("This is Java Programming");  
    }  
}

Hello World