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CSE MCQs :: Apache Common Collections

Apache Common Collections -
  1. Which Map is synchronized?
    2. A.
    Hashtable
    B.
    ConcurrentSkipListMap
    C.
    ConcurrentHashMap
    D.
    All of these

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  2. Which of these is not an interface in the Collections Framework?
    3. A.
    Collection
    B.
    Group
    C.
    Set
    D.
    List

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  3. Which is best suited to a multi-threaded environment?
    4. A.
    WeakHashMap
    B.
    Hashtable
    C.
    HashMap
    D.
    ConcurrentHashMap

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  4. concurrentSkipListMap allows
    5. A.
    one null key
    B.
    many null values
    C.
    all
    D.
    None

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  5. The accuracy and efficiency of a HashMap can be guaranteed with
    6. A.
    override equals method
    B.
    Override hashCode method
    C.
    None of these
    D.
    All of these

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  6. Which allows the removal of elements from a collection?
    7. A.
    Enumeration
    B.
    Iterator
    C.
    Both
    D.
    None

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  7. The Comparable interface contains which called?
    8. A.
    toCompare
    B.
    compare
    C.
    compareTo
    D.
    compareWith

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  8. Which provides better performance for the insertion and removal from the middle of the list?
    9. A.
    Vector
    B.
    ArrayList
    C.
    LinkedList
    D.
    All of these

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  9. Which of these class should be preferred to be used as a key in a HashMap?
    10. A.
    String
    B.
    Integer
    C.
    Double
    D.
    Any of these

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  10. Iterator returned by ConcurrentHashMap on key, value and entry is?
    11. A.
    Fail-fast
    B.
    Fail-safe
    C.
    None
    D.
    All

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