Removing null references from a HashSet
22,592
Solution 1
Since a Set
can not contain the same value twice (including null
, if it is supported by the specific Set
implementation), simply doing set.remove(null)
would be sufficient.
Note that you don't even need to check for the existence of null
before, because remove(null)
will simply do nothing if the Set
doesn't contain null
.
Solution 2
A HashSet
, being a set, only contains one "copy" of any object, which also means that it can only contain one instance of null
. Thus, you can just use HashSet.remove(null)
.
Author by
Mouna Cheikhna
Software Engineer at Microsoft Email : [email protected]
Updated on July 05, 2022Comments
-
Mouna Cheikhna almost 2 years
Is there a simple way of removing null references from a HashSet like the way we can delete them from a List using
list.removeAll(Collections.singletonList(null))
? -
Shimmy Weitzhandler about 4 yearsIs there a .NET alternative to a
HashSet<string>
that does not allow null values?