hash - Why doesn't Java's hashCode support universal hashing? - Stack Overflow
Simplicity. Java allows class designers to provide their own hashCode, which as you mention is good enough for "ordinary" hash tables, and can be hard enough to understand.
Besides, when the Java Collections API was designed, having generic hash tables in the standard library was bold enough a move already. C has never had them. C++ had them in the STL as hash_set and hash_map, but those didn't make it into the standard. Only now, in C++0x, are hash tables being considered for standardization again.
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