I know that the blog title look like not so good for some people. but my reason behind this is that there are many people who is working in java technologies from many years.(here, I’m talking about people who have experience around 2 -3 year) but not all of them are aware of each and every part of java. So, My goal behind writing this is to help them get to know more about it. which will be very interesting for some Java developer or the peoples who are interested in learning java.