Vector hash ArrayList list

1. If thread requires security, use Vector,hashtable

2. If you do not require thread safety, you should use Arraylist,linkedlist,hashmap

3, if the key value pair is required, then use HashMap, Hashtable

4, if the data is large, but also thread safety considerations vector

The most efficient access is arraylist,hashtable.
If you do a lot of insert/delete operations, rather than simply accessing the elements in the container, you should use LinkedList.

Under single thread: vectors and Hashtable have been replaced by ArrayList and HashMap, so the efficiency is the lowest,