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      EPAM Systems

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      Lead/Senior Java Developer : entretien chez EPAM Systems

      Question d’entretien chez EPAM Systems

      Entretien pour Lead/Senior Java Developer

      What if we insert with key null to a HashMap?

      Réponses aux questions d'entretien

      Utilisateur anonyme

      4 mai 2019

      Didn't know, however, it's a very edge case, you can insert and the hashcode will be 0, so it's identifying the '0' bucket.

      Utilisateur anonyme

      1 sept. 2020

      HashMap allows null as both key and value, as well. So you can associate a value to null key. However, TreeMap throws a NullPointerException if you try to put a key with null value.

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