Java Overview

Java is a high-level programming language developed by Sun Microsystems and released in 1995. Java runs on a many platforms, such as Windows, Mac OS, and the various versions of UNIX.

Feature of Java:

  • Object Oriented: Java is an object oriented language. In Java, everything is an Object. Java can be easily extended since it is based on the Object model.
  • Platform independent: Unlike many other programming languages including C and C++, when Java is compiled, it is not compiled into platform specific machine, rather into platform independent byte code. This byte code is distributed over the web and interpreted by virtual Machine (JVM) on whichever platform it is being run.
  • Simple: Java is designed to be easy to learn. So, it is a simple language. If you understand the basic concept of OOP Java would be easy to master.
  • Secure: Java is a secure language. With Java’s secure feature it enables to develop virus-free, tamper-free systems. Authentication techniques are based on public-key encryption.
  • Architectural-neutral :Java compiler generates an architecture-neutral object file format which makes the compiled code to be executable on many processors, with the presence of Java runtime system.
  • Portable: Being architectural-neutral and having no implementation dependent aspects of the specification makes Java portable. Compiler in Java is written in ANSI C with a clean portability boundary which is a POSIX subset.
  • Robust: Java makes an effort to eliminate error prone situations by emphasizing mainly on compile time error checking and runtime checking.
  • Multithreaded: With Java’s multithreaded feature it is possible to write programs that can do many tasks simultaneously. This design feature allows developers to construct smoothly running interactive applications.
  • Interpreted: Java byte code is translated on the fly to native machine instructions and is not stored anywhere. The development process is more rapid and analytical since the linking is an incremental and light weight process.
  • High Performance: With the use of Just-In-Time compilers, Java enables high performance.
  • Distributed: Java is designed for the distributed environment of the internet.
  • Dynamic: Java is considered to be more dynamic than C or C++ since it is designed to adapt to an evolving environment. Java programs can carry extensive amount of run-time information that can be used to verify and resolve accesses to objects on run-time.

History  of Java

Java is pure object oriented programming language. It is developed by James Gosling; He is a famous software developer. He developed many compilers and mail systems. Since 1984, he has been associating with Sun Micro Systems and developed Java Programming language in 1991.He was also elected to the United States national Academy of Engineering for this achievement.

Year Development
1990 Sun Micro systems decide to developed special software that could be used to manipulate consumer devices. A team of Sun Micro systems programmers headed by James Gosling was formed to under take this task.
1991 Team announced a new language named “Oak”.
1992 Green Project teams demonstrated the application of their new language to control a list of home appliances using a hand-held device. \
1993  The green Project team came up with the idea of  developing web applets using the new language that could run on all types of computers connected to Internet
1994 Team developed a Hot Java to locate and run applet programs on Internet.
1995 Oak was renamed “Java” due to some legal snags.

Where Java is used?

According to Sun, 3 billion devices run Java. 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. Enterprise Applications such as banking applications.
  3. Web Applications such as, etc.
  4. Smart Card
  5. Robotics
  6. Mobile
  7. Games
  8. Embedded System  etc.

Compile/Execute Java Programs

public class simple {

public static void main(String []args)
System.out.println(“Hello World”);

1.First we write the  above code in notepad editor or any other java supported editor.

2. Then save the program with .java extention in java’s bin folder.e.g

3. Then open the prompt and execute like following:


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