#hashmap performance

Java: Difference between HashMap and Hashtable

HashMap and Hashtable both implements Map interface and used to store data in key and value pairs. Both use hashing techniques to get unique keys.

Apart from some similarities, there are many differences between HashMap and Hashtable classes as follows:

java.util.HashMap java.util.HashTable HashMap class introduced in JDK 1.2. Hashtable is a legacy class. HashMapinherits AbstractMap class.