INTRODUCTION
Java is an object oriented programming language. James Gosling invented Java in the year 1991 from Sun Micro systems. The main aim of Java is to write a program once. So that it can run on many operating systems as it is platform independent. In 1995 the first version of Java (Java 1.0) came into existence. Oak is the name given earlier, as Oak was unsuccessful. It was then renamed as Java. The version of Java that is currently available is Java 1.8 also known as Java 8. Java is a programming language and a platform. Java is high level and object oriented programming language. Any hardware or software environment in which a program runs is platform. Since Java has its own run-time environment and API, it is platform. In early days, different electronic devices should have different operating systems. So to run every device on unique software came a unique term Java. It is platform independent. It can operate and execute in any operating system. Java works on the principle "W