Java – hashcode of null key in HashMap

• Java

I just read the difference between HashMap and hashtable classes in Java There I found a difference. The former allows null keys and later does not have the same permissions

Solution

From HashMap:

public V put(K key,V value) {
   if (key == null)
      return putForNullKey(value);
   ...

If you look further, you will see that null always goes to bin 0

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