Question

To store non-duplicated objects in the order in which they are inserted, use:______

a. HashSet
b. LinkedHashSet
c. TreeSet
d. ArrayList
e. LinkedList

Answer 1

b. LinkedHashSet

Step-by-step explanation:

A LinkedHashSet is an ordered version of HashSet that maintains a doubly-linked List across all elements. When the iteration order is needed to be maintained this class is used. LinkedHashSet maintains a linked list of the entries in the set, in the order in which they were inserted.