Checking if a collection is empty in Java: which is the best method?

Question

I have two ways of checking if a List is empty or not

if (CollectionUtils.isNotEmpty(listName)) 

and

if (listName != null          


        

Answer 1

CollectionUtils.isNotEmpty checks if your collection is not null and not empty. This is better comparing to double check but only if you have this Apache library in your project. If you don't then use:

if(list != null && !list.isEmpty())