Where can I find a large number of Java core questions?

Question

Java

Interested in where you can find a large number (up to a thousand or several) Java core tests (not in the sense of unit testing, etc., but in the sense of multiple choice questions, well, or questions for which you can find a short unambiguous answer "by essence")?
What works: Any online or book source filled with tests - preferably with multiple choice answers, but simple tests are also suitable. Paid options are considered, if it is something like a book entirely devoted to questions and answers to them, for an adequate price.
What is not suitable: small sites dedicated to testing, with tests for a dozen or two questions and / or a time limit / number of tests per day.

Answer 1

I'm not sure that everything will be straight, but it's worth looking here www.programmr.com

Answer 2

Most likely here www.amazon.com/OCA-Java-Programmer-Certification-G...
And here http://education.oracle.com/pls/web_prod-plq-dad/d...