Java Collections Questions and Answers

@qs_by_qset

Created this 7 months ago

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1. What is the difference between a List and a Set in Java?

2. How do you create an ArrayList in Java?

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3. How do you get the first element of a LinkedList?

4. What is the difference between a HashMap and a TreeMap?

5. How do you create a HashSet in Java?

6. How do you iterate over an array in Java?

7. What is the difference between an ArrayList and an array?

8. How do you sort a List in Java?

9. What is the difference between a Stack and a Queue?

10. How do you create a PriorityQueue in Java?

11. What is the difference between a Collection and a Map?

12. How do you create a HashMap in Java?

13. How do you iterate over a Map in Java?

14. What is the difference between a WeakHashMap and a HashMap?

15. How do you create a ConcurrentHashMap in Java?

16. What is the difference between a CopyOnWriteArrayList and an ArrayList?

17. How do you create a BlockingQueue in Java?

18. What is the difference between a Deque and a Queue?

19. How do you create a LinkedHashSet in Java?