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Discussion :: Objects and Collections

  1. What two statements are true about properly overridden hashCode() and equals() methods?

    1. hashCode() doesn't have to be overridden if equals() is.
    2. equals() doesn't have to be overridden if hashCode() is.
    3. hashCode() can always return the same value, regardless of the object that invoked it.
    4. equals() can be true even if it's comparing different objects.

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

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    Answer : Option C

    Explanation :

    (3) and (4) are correct.

    (1) and (2) are incorrect because by contract hashCode() and equals() can't be overridden unless both are overridden.

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