Returns this map's entry for the given key, or {@code null} if the map
does not contain an entry for the key.
@return this map's entry for the given key, or {@code null} if the map
does not contain an entry for the key
@throws ClassCastException if the specified key cannot be compared
with the keys currently in the map
@throws NullPointerException if the specified key is null
and this map uses natural ordering, or its comparator
does not permit null keys
Returns this map's entry for the given key, or {@code null} if the map does not contain an entry for the key.
@return this map's entry for the given key, or {@code null} if the map does not contain an entry for the key @throws ClassCastException if the specified key cannot be compared with the keys currently in the map @throws NullPointerException if the specified key is null and this map uses natural ordering, or its comparator does not permit null keys