This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Mughal has a nice set of diagrams showing the main collection interfaces and classes. What to study: Collections class Collection interface List interface Iterator interface ListIterator interface Vector class ArrayList class LinkedList class Set interface TreeSet class Map interface HashMap class Hashtable class Comparator interface Comparative interface -anthony