type of hash table? code example

Example 1: hashtable

- HashTable don't have null key, sychronized(thread-safe)
good for parallel testing

Example 2: hashing in data structure

Hashing is an important Data Structure which is designed to use a special function called the Hash function which is used to map a given value with a particular key for faster access of elements. The efficiency of mapping depends of the efficiency of the hash function used.