What is Java?

  • Java is an object oriented programming language which is platform independent and more secure.
  • It has full GUI and network support
  • It derives syntax from the C language and object-oriented features for the C++
  • It can execute stand-alone or “on-demand” in web browser as applets

History of Java

  • Java was created by a team of programmers at sun Micro-systems of U.S.A in 1991.
  • It was initially called “Oak” by James Gosling but it was renamed as “Java” in 1995.
  • Java was designed for the development of portable and platform independent software for electronics devices like microwave ovens, VCRs, and such electronics machines.
  • But after the popularity of Internet, sun realized that Java is the perfect programming language for the Web.
  • Late 1995 and early 1996 they released Java and it became so popular.

JDK Editions

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

The java Developer’s Kit (JDK)

  • Java Development Kit (JDK) is a programming environment used to develop java programs.

JAVAC (Java Compiler):

  • Javac is a java compiler that translates java source file into a form the computer can run. Output of java compiler is the “ByteCode


  • It executes Java byte code generated by the compiler.