data structures resources?

[Mike Pirrone]

any websites or books anyone can reccomend on data structures in java? i'm taking the class next summer at my school but want to get a head start now. thanks
-mike-

[Dirk Schreckmann]

Data Structures and Algorithms with Object-Oriented Design Patterns in Java by Bruno Preiss is available free on-line and is a decent introduction to the topic that's worth reading.
David Eck's Introduction to Programming Using Java provides nice, simple, clear, short explanations of introductory data structure concepts. (Look towards the later chapters.)