Which is better Hashtable or HashMap?

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4. How does yield work in Scala?
5. Which is better HashMap or ArrayList?
6. What is trait in Scala?
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Tags

1. #often
2. #objects
3. #performance
4. #former
5. #hashmap
6. #single
7. #memory
8. #unsynchronized
9. #faster
10. #environment
11. #better
12. #object
13. #synchronized
14. #threaded
15. #hashtable
16. #compare