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This collection of questions covers a wide range of Java data structures, including lists, sets, maps, queues, and more.
Practice these questions and get feedbacks! It will help you improve your answer.
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1. What is the time complexity of searching for an element in a HashMap?
2. What is the difference between a Stack and a Queue?
3. What are the advantages of using Java Generics?
4. What is the difference between an ArrayList and a LinkedList?
5. What is the difference between a Thread and a Runnable?
6. What is the difference between a synchronized method and a synchronized block?
7. What is the purpose of the volatile keyword?
8. What is the purpose of the Collections.sort() method?
9. What is the purpose of the Comparator interface?
10. What is the purpose of a BlockingQueue?
11. What is the difference between a Set and a SortedSet?
12. What is the difference between a raw type and a parameterized type?
13. What is the purpose of a TreeMap?
14. What is the difference between a ReentrantLock and a synchronized block?
15. What is the purpose of a ThreadLocal?
16. What is the purpose of a LinkedHashSet?
17. What is the difference between a HashMap and a ConcurrentHashMap?
18. What is the time complexity of finding the minimum or maximum element in a TreeSet?
19. What is the purpose of a PriorityQueue?