First of all, is there a pdf of the kb book ( I have the book) that has similar pdf pages to book pages? Book page 828 has pdf page 866 which is bullshit. Sorry ..Is there a new version of the kb book (last one 2008) planned to change this?
Regarding book page 591, exam watch: pollfirst on a)copy and b) collection is explained. Transmitting this explanation to the example on page 589:
first output of two outputs is {a=ant, d=...} {d=dog}
so if:
subMap.pollfirstEntry() --> d=dog removed from map and submap
map.pollfirstEntry() --> a=
ant removed from map
Is it correct?
What if {d=dog, ...} {d=dog}
and then map.pollfirstEntry() ? Using delete first on original collection when first elements in copy and original are similar.
Are both dogs deleted?
I will try it now in my editor, but would like to understand the result.
