The Trove collection classes
TheTrove, an open source Java collection package, provides an efficient alternative to the core Java collection classes, especially for implementing collections whose keys or values are primitive types. In this installment of
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Open addressing
Trove maps are implemented using open addressing instead of chaining. Within the Java core collection classes, most maps are implemented using chaining, which works so that if more than one key maps to the same index location in the table, then that index location holds a linked list of all the elements mapping to that location. Open address maps instead assume that there is likely to be a nearby free index in the table. That way, if the ideal slot is full, the map implementation looks in the next few slots to find an open slot. This approach eliminates the need for the linked list nodes, so Trove maps tend to have a smaller memory footprint than the equivalent core collection classes. With open addressing, you need to be careful that the map is maintained at a size that allows sufficient free indexes so that performance doesn't suffer. (Trove accomplishes this feat by keeping the load factor under 0.5.) But otherwise, open addressing is equally as efficient as chaining -- and can be better in many cases
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