Why is Hashtable obsolete?

Related questions

1. What is iterable in Scala?
2. Are lists mutable in Java?
3. Why HashMap is faster than HashSet?
4. Which is better Hashtable or HashMap?
5. What is the difference between HashMap and Hashtable?
6. What does Scala mean?
7. What is iterator in Scala?
8. What is the function of map updating method remove Object key?
9. Which map will allow duplicate keys?
10. Can a HashMap have duplicate keys?

Tags

1. #hashmap
2. #requires
3. #while
4. #synchronized
5. #method
6. #javadoc
7. #reference
8. #could
9. #relevant
10. #obsolete
11. #cases
12. #hashtable
13. #there
14. #important
15. #methods
16. #being
17. #outside
18. #difference
19. #control
20. #states