Is this is suffient knowledge or I have to read some books related to java??

Answer 1

IMO yes, there is sufficient knowledge in the course offered for Java. However, you will not be able to apply it effectively by simply looking at the courses. Books will help greatly by showing you how to put the knowledge into real, practical use.
There's of course, lots of stuff not offered in the courses that you could find in a book, for example sorting algorithms.

What I'm trying to say is, technically you could figure out the sorting algorithms on your own from the knowledge in the courses since they don't use new material. But in reality, you'd probably only be able to do the basic sorts, which is where books come in handy for the more advanced, more reliable things that the books facilitate.

ps: sorry, I can't recommend any Java books, never read any.

Answer 2

can u please tell me the books name??

Answer 3

The course available here is great to start developing with Java, but if you want to progress further you really should read some books. As for what books, it really depends on what you are targeting. If you aren't targeting a specific platform/device, Java: The Complete Reference should be a good choice.