HashList is a data structure storing objects in a hash table and a list.it is a combination of hashmap and doubly linked list. acess will be faster. HashMap is hash table implementation of map interface it is same as HashTable except that it is unsynchronized and allow null values. List is an ordered collection and it allow nulls and duplicates in it. positional acess is possible. Set is a collection that doesn't allow duplicates it may allow at most one null element. same as our mathematical set.

HashMap is an unordered and unsorted map. Allow one null key and many null values.

Lists are collections that maintain their elements in order and can contain duplicates.