Category: Java Interview

Java Interview Question for Java Developer with levels: interns, fresher, junior

56. Tell me about vectors?

57. Talk about Queue Interface?

59. Why HashSet can’t contain duplicated elements and can’t main the order of elements?

60. What is the difference between List and Set?

61. Compare Hash Set, LinkedHashSet and TreeSet

62. You add an element already exist in SET. How did JVM do that? Equal () method and HashCode() method, which one call first.

64. Compare to HashMap and ConcurrentHashMap?

65. Compare Hashtable and HashMap?

66. What is a thread pool?

67. Compare Comparable and Comparator Inteface?