Hash table and application in java

1. Hashset subbing layer is set hashmap
2. hash algorithm, HA is a class of algorithms; hash table, HT is a data structure; hash functions, HF is a function of a class hash table supporting the
3. HA: from different inputs, with some piece of data values ​​calculated extirpated, to distinguish input data. (Example: the MD5); Objective: an information security: do encryption algorithm; second data field structure: Quick Find.
4. HT: a set of keywords mapped onto a limited set of successive addresses, and the address keywords set to image recorded as the storage location in the table, this correspondence is called HF, according to this idea of ​​establishing table table called HT.