The best replacement for concurrenthashmap is hashmap.

The best alternatives to concurrenthashmap are rated as following:
★★★★★  hashmap
★★★★★  hashtable
★★★★  synchronized
★★★  hashmap performance
★★  concurrentskiplistmap
★★  guava cache
★  synchronized hashmap
★  reentrantreadwritelock
★  copyonwritearraylist
  synchronized map
  synchronizedmap

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Speaking about concurrenthashmap, one probably shouldn't forget about lru.

Other search terms related to concurrenthashmap and their ratings are:
★★★★★ lru
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