REMINDER: hw2, written (3 questions) and program (persistent
red-black) is due Tuesday next week.  I still need to work on the
turnin script, and possibly a better test driver.

Today we start hashing, section 3.4.  This is a new topic for some of
you, and a review for others.  Today we look at the textbook slides,
and the two most common forms of hashing: separate chaining and linear
probing.  We may get into less familiar variants on Wednesday.

Slides:  34HashTables.pdf
Code: ../book/LinearProbingHashST.java
      ../book/SeparateChainingHashST.java