Which is better HashMap or ArrayList?

Related questions

1. How does yield work in Scala?
2. What is the difference between HashMap and Hashtable?
3. What are RDDS in spark?
4. Why Hashtable not allow null but HashMap allow?
5. Which map will allow duplicate keys?
6. What is trait in Scala?
7. What is map in spark?
8. What is difference between MAP and flatMap in Scala?
9. Why is Hashtable obsolete?
10. Why HashMap is faster than HashSet?

Tags

1. #completely
2. #hashmap
3. #array
4. #index
5. #different
6. #usage
7. #based
8. #between
9. #their
10. #working
11. #which
12. #stored
13. #structure
14. #implementation
15. #backed
16. #retrieve
17. #works
18. #hashing
19. #difference
20. #objects
21. #though
22. #arraylist
23. #while
24. #store
25. #values