Material:

Java syntax:
primatives vs. reference types
strings, string comparison, assignment
Integer vs. integer
pass by reference vs. by value
classes, objects
arrays vs. arraylists
arraylists vs arraylists
static vs. non-static data members and methods
public, private, protected, package
inheritance via extends
implements for interfaces

semantics:
Person, Book, MyLibrary class and how they interact
Linked list
Maybe to make a similar class, extend the class by adding functionality