Java is the programming language of choice by millions of programmers worldwide due to its immense popularity and acceptability in IT and electronic market place. Java is almost everywhere starting from computers to micro oven to wrist watches to set top boxes and also to your car’s music system. The slogan of Java “Write Once and Run every where” is perhaps the most exciting of all slogans in IT world! Java is taught right from school books to university projects. A concrete knowledge of Java is very essential towards development of Android applications. Using Java we can write desktop applications using AWT or Swing or we can develop web server applications on JSP Servlet eco space. Java is quite a simple programming language compared to many of its counterparts. A strong knowledge of Java will pave a path towards a very successful IT carrier in future.