The best replacement for hashtable is hashmap.

The best alternatives to hashtable are rated as following:
★★★★★  hashmap
★★★★  dictionary
★★★  array
★★★  arraylist
★★  hashset
★★  concurrenthashmap
★  list
★  linked list
★  hashmap java
★  map
★  tree
★  bst
  arraylist java
  hashmap c#
  sortedlist
  hashmap which is better
  hashset c#
  trie
  dictionary performance
  dictionary java
  vector
  hashset c
  list c#
  synchronized hashmap
  hashmap in java
  dictionary in c#
  datatable
  sorted list
  dictionary c#
  treemap

Your alternative for hashtable is not listed? Suggest!
Speaking about hashtable, one probably shouldn't forget about iterator.

Other search terms related to hashtable and their ratings are:
★★★★★ iterator
You have in mind a companion for hashtable and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of hashtable in all years. Click on graph for more.
hashtable
hashmap
dictionary