Redis supports 5 data types.
String String
Hash / Hash Hash
Redis hashes/Hashes are collections of key-value pairs.
List List
Redis lists are just lists of strings, sorted by insertion order. You can add elements to the head or tail of a Redis list.
Example of Jedis operating Redis List: http://huangqiqing123.iteye.com/blog/2390948
Collection Set
A Redis collection is an unordered collection of strings. There cannot be duplicate values in the collection. The same value can be placed in the same collection multiple times (no error will be reported), but there is always only one value in the collection.
Sortable collection ZSet
ZSet is similar to Set, which is a set of non-repeating characters. The difference is that each member of the Zset is associated with a score, which is used for a sorted set ordered from the smallest score to the largest score.
In the same Zset collection, when elements with the same value are placed, the elements placed later will overwrite the elements placed first (value + score).
