How to choose between ConcurrentHashMap and EHCache for stand-alone cache?

how do they compare their advantages and disadvantages?
I feel that ConcurrentHashMap will have higher performance, after all, the built-in

Feb.28,2021
The focus of

is different. ConcurrentHashMap is essentially a data structure hash map, based on memory, while ehcache is a caching solution, such as caching data obsolescence, cache data expiration, data persistence, etc., and is more inclined to be a class library with more comprehensive functions. Depending on your application scenario, if it is just storage, of course, choose ConcurrentHashMap; cache and choose ehcache (of course, you can also implement your own cache framework based on the existing basic data structure)

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1ea752b-46b8b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea752b-46b8b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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