java.lang package
Class: CountComparable API

hash package
Class: CountComparable API
Class: hashcode and dictionary
http://www.cse.iitk.ac.in/users/cs210/html/assign-6.htm

lists: implementation package
the List interface

Binary Search Trees package
Click here
This article give a brief, non-academic ,explanation of what binary trees are about. It also provide source and demo of a generic tree class. Functionality to balance the tree is also described/provided.

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Nice Links:
1. http://java.sun.com/docs/books/tutorial/collections/index.html
---------> The Collections trail introduces Java Collections Framework.
2. The Java Language Specification by Gosling, Joy, and Steele (Addison-Wesley, 1996).
--------->Java tutorial by Sun
3. http://www.cyberdyne-object-sys.com/oofaq2/body/langspec.htm#S4.102
---------> Links to free online Java tutorials 4.

Nice Books:
1. The Java Programming Language by Arnold and Gosling (Addison-Wesley, 1996).
2. Just Java by van der Linden (Prentice-Hall, 1997).
3. The Java Language Specification by Gosling, Joy, and Steele (Addison-Wesley, 1996).