I am off topic, please don't delete me

I am interested in a Java workbook with simple problems that target Java specific features.
I don't want to end up proving fundamental theorem of calculus in a problem and learn nothing about Java.
I know how to program in C++ so I am not interested in explanations of a for loop.
Want to learn things related to keywords: extends, implements, super , @Override ,interface ,final ....
Many thanks.