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Java Collections Interview Questions

  1. What is Java Collections Framework ? Explain some benefits of Collections framework ?
  2. What is Collection Interface In Java ?
  3. What is List Interface In Java ?
  4. What is Set Interface In Java ?
  5. What is the difference between List and Set Interface In Java ?
  6. What is ArrayList Class In Java ?
  7. What is the difference between Array and ArrayList In Java ?
  8. What is Vector Class In Java ?
  9. What is the difference between ArrayList and Vector In Java ?
  10. What is LinkedList Class In Java ?
  11. What is the difference between ArrayList and LinkedList In Java ?
  12. What is EnumSet In Java ?
  13. What is HashSet Class In Java ?
  14. What is TreeSet Class In Java ?
  15. What is LinkedHashSet Class In Java ?
  16. What is the difference between HashSet and TreeSet In Java ?
  17. What is Map Interface In Java ?
  18. What is Map.Entry Interface In Java ?
  19. What is HashMap Class In Java ?
  20. What is the difference between HashSet and HashMap In Java ?
  21. What is HashTable Class In Java ?
  22. What is the difference between HashMap and Hashtable In Java ?
  23. What is TreeMap Class In Java ?
  24. What is the difference between HashMap and TreeMap In Java ?
  25. What is ConcurrentHashMap Class In Java ?
  26. What is the difference between HashMap and ConcurrentHashMap In Java ?
  27. What is LinkedHashMap Class In Java ?
  28. What is EnumMap In Java ?
  29. What is the Dictionary class In Java ?
  30. What is Properties Class In Java ?
  31. What is Comparator Interface In Java ? 
  32. What is difference between Comparable and Comparator interface In Java?
  33. What is Iterator Interface In Java ?
  34. What is the difference between Iterator and ListIterator In Java ?
  35. What is Enumeration Interface In Java ?
  36. What is the difference between Iterator and Enumeration In Java ? 
  37. What is Queue Interface In Java ?
  38. What is PriorityQueue Class In Java ?
  39. What is AbstractQueue Class In Java ?
  40. What is Deque Interface In Java ?
  41. What is Arrays Class In Java ?
  42. What is Cloneable Interface In Java. Explain with Example ?
  43. What is Serializable Interface In Java. Explain with Example ?
  44. What are Aggregate Operations In Java Collection ?
  45. How HashMap works Internally In Java ?
  46. What is Contradiction between hashCode() and equals() method in Java ?
  47. What are Different ways to Iterate Over HashMap in Java ?

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