I was wondering if anyone knew a good book about hashing, or if anyone does work with hash functions.
Compilers Principles, Techniques, and tools has a chapter. So does Introduction to Algorithms. Besides these two, there are books dedicated to this.
. . . Post your question. And we'll all give it a whirl. As for information on Hashing . . . tons of it everywhere. Pick up any college-level data structures book. College-level algorithm books also will most likely cover hashing. Another way to learn about hashing at the source-code level is to look at the Java API source code. Take a look at the HashTable and HashMap classes. There are even LinkedHashMap classes and TreeMap classes to peruse through too. Good luck.