Explore the English language on a new scale using. The very simple hash table example In the current article we show the very simple hash table example. It uses simple hash function, collisions are resolved using linear probing (open addressing strategy) and hash table has constant size. This example clearly shows the basics of hashing technique. Hash table Underlying array has constant size to store 128 elements and each slot contains key-value pair. Key is stored to distinguish between key-value pairs, which have the same hash.

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Hash function Table allows only integers as values. Hash function to be used is the remainder of division by 128. In the view of implementation, this hash function can be encoded using remainder operator or using bitwise AND with 127.

Power of two sized tables are often used in practice (for instance in Java). When used, there is a special hash function, which is applied in addition to the main one. This measure prevents collisions occuring for hash codes that do not differ in lower bits. Webctrl 500 manual.

Collision resolution strategy Linear probing is applied to resolve collisions. In case the slot, indicated by hash function, has already been occupied, algorithm tries to find an empty one by probing consequent slots in the array. Linear probing is not the best techique to be used when table is of a constant size. When load factor exceeds particular value (appr. 0.7), hash table performance will decrease nonlinearly. Also, the number of stored key-value pairs is limited to the size of the table (128).

Code snippets This implementation suffers one bug. When there is no more place in the table, the loop, searching for empty slot, will run infinitely.

It won't happen in real hash table based on open addressing, because it is most likely dynamic-sized. Also the removal's implementation is omitted to maintain simplicity. See for full implementation. Java implementation.