Alexander Nikolov :
I would like to remove an empty String from the List of Strings.
Here is what I tried, using the stream API:
list.stream().filter(item-> item.isEmpty()).collect(Collectors.toList());
After that empty string is still present in the list. What am I missing?
JB Nizet :
filter() keeps the elements that match the predicate. Soyou need the inverse predicate:
list.stream().filter(item-> !item.isEmpty()).collect(Collectors.toList());
This will also not modify the original list. It will create a filtered copy of the original list. So you need
list = list.stream().filter(item-> !item.isEmpty()).collect(Collectors.toList());
If you want to modify the original list, you should use
list.removeIf(item -> item.isEmpty());
or simply
list.removeIf(String::isEmpty);
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