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Discussion :: Objects and Collections

  1. Which of the following statements about the hashcode() method are incorrect?

    1. The value returned by hashcode() is used in some collection classes to help locate objects.
    2. The hashcode() method is required to return a positive int value.
    3. The hashcode() method in the String class is the one inherited from Object.
    4. Two new empty String objects will produce identical hashcodes.

    2. A.
    1 and 2
    B.
    2 and 3
    C.
    3 and 4
    D.
    1 and 4

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    Answer : Option B

    Explanation :

    (2) is an incorrect statement because there is no such requirement.

    (3) is an incorrect statement and therefore a correct answer because the hashcode for a string is computed from the characters in the string.

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