Hi Jeanne and Scott,
I got your Java 11 Study Guide 2 weeks ago. I find it excellent. I love the way you methodically treated Streams with loads of small code examples - focusing on the issue at hand. I loved your comments regarding the API being hard to read i.e. generics, wildcards, super, extends. In that area it is very hard to read. Your code examples took all that away e.g. accumulators and combiners are now very straight forward.