Java Collections Framework

class- and interface hierarchy of java.util.Collection

class- and interface hierarchy of java.util.Map

Refences:

1. Java collections framework from wikipedia.
2. Java Collections Framework by John Zukowski. This short document(44 pages) gives a clear overview of Collection Framework. Also it provides some usage examples and exercises. Strongly recommeded.
3. Magic with Merlin: Maintaining insertion order Working with the new linked HashSet and HashMap implementations. One of series by John Zukowski. Dig deep into Java Collection classes.