Which Collection Class maintains insertion order in Java .

Question

1) ArrayList 2) HashSet 3)LinkedSet 4) PriorityQeue

Answer 1

1) ArrayList - yes

2) HashSet - no
3) LinkedSet - doesn't exist, but
LinkedHashSet - yes
4) PriorityQeue - doesn't exist,
PriorityQueue has natural order or by used Comparator

Answer 2

Sanjay kumar Sahu,

For future posts please use the programming language in tags, so that the community has a more precice idea what your issue is.

Answer 3

Lists in java maintains order in a way values inserted. While Sets ( also PriorityQueue) don't maintain order. So ArrayList maintains order but HashSet, LinkedHashSet, PriorityQueue don't maintains the order of elements..

Answer 4

4?

Answer 5

The way you are inserting the data , the same way it will print. Means Insertion order.