What if we insert with key null to a HashMap?

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Anoniem · Accepted Answer

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.

Anoniem · Answer

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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