null-safe Collection contains method
12,186
You should instead be applying the Null Object Pattern here and use an empty collection, rather than a null collection. Of course, perhaps this is appropriate for your problem, but without more context it's hard to tell. In other words, I think you are solving the wrong problem -- why might collection
be null in the first place?
Author by
wrschneider
Updated on June 28, 2022Comments
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wrschneider almost 2 years
What's the best way to do null-safe
contains
on a Java collection?in other words -
if (collection != null && collection.contains(x))
?
I was hoping Apache commons-collections had something like
CollectionUtils.contains(collection, x)
that would simply return false if the collection was null, as there is withsize()
, which treats null like an empty collection.However, it seems like there is no such thing - did I just miss it?