top 5 books in java and j2ee

are there are books which are less small in page number and good in content?

I have limited time to read many pages a day. please advise

are there are books which are less small in page number . . .

You mean books with even more pages?

Effective java I have which has manageable less number of pages to read and complete in one two months.  If book has like 1000 pages it takes too long time to complete.
How to eat a programming book.  I mean and remember concepts forever.  Is it better to make notes on separate notebook or use pencil and make notes on same page of book.

"Java Concurrency in Practice" isn't very long - but it's not a beginner book.  You should be comfortable with Java first.

Like you said, Effective Java is also good because it's not too long.

I agree with you that books should be focused - so shorter is usually better.  Some "Java" books just print out large quantities of the online documentation - not very helpful.

If you want to get ready for Java 8, then "Functional Programming in Java" is good and very short (under 200 pages).

Doug

i see some books have chapters related to C and C++ developers which i am not familiar. I wonder if books are dedicated fore java and JEE alone. please advise

what is importance of java concurrency to a java k2ee developers. please advise

Over to doug.

what is importance of java concurrency to a java j2ee developers. please advise

Today most Java applications are multi threaded (J2ee or elsewhere).  Tomorrow even more apps will be multi threaded because modern CPUs are adding more cores (i.e. you get more CPUs to work with) rather than having 1 CPU that runs a lot faster.

So if you're learning, you really should understand concurrent programming if you're looking to build a career using Java.  You won't necessarily need this knowledge on day 1 of a job, but if you don't eventually get it, you'll likely limit your career potential.

10 years ago this knowledge was largely optional.  Today it's less and less so.

Doug

The API lit can be daunting, as it is often scant. So I'd say that when you get to parts that need elucidation . . . .     the EE top crew can help you. (I am not one of the top crew here, btw. But EE is probably one of the greatest resources in existence on the subject.)