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This document contains a list of questions and answers on Java collections.
Practice these questions and get feedbacks! It will help you improve your answer.
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1. What is the difference between an ArrayList and an array?
2. How do you get the first element of a LinkedList?
3. How do you iterate over a Map in Java?
4. How do you create a HashSet in Java?
5. What is the difference between a HashMap and a TreeMap?
6. What is the difference between a Collection and a Map?
7. How do you iterate over an array in Java?
8. How do you create a HashMap in Java?
9. How do you create an ArrayList in Java?
10. How do you create a BlockingQueue in Java?
11. How do you create a PriorityQueue in Java?
12. What is the difference between a List and a Set in Java?
13. What is the difference between a Deque and a Queue?
14. How do you create a LinkedHashSet in Java?
15. What is the difference between a Stack and a Queue?
16. What is the difference between a CopyOnWriteArrayList and an ArrayList?
17. What is the difference between a WeakHashMap and a HashMap?
18. How do you create a ConcurrentHashMap in Java?
19. How do you sort a List in Java?