How to convert java stream collect to scala

Question

Java code

objRefs = objRefs.stream().filter(objRef -> DataUtil.isNotEmpty(objRef)).collect(Collectors.toCollection(LinkedHashSet::new));

How to convert it to scala? Following code compile error

objRefs = objRefs.stream().filter(objRef => DataUtil.isNotEmpty(objRef)).collect(Collectors.toCollection(LinkedHashSet::new));

Martijn · Accepted Answer · 2020-09-11 10:09:11Z

2

LinkedHashSet::new is not valid scala. Do you mean to call the constructor of LinkedHashSet? If so, use new LinkedHashSet(_)

The solution you've chosen is translating java to scala. If you do that, there is little value in using scala at all, and you might as well use java.

A more idiomatic solution would be

objRefs.stream().filter(DataUtil.isNotEmpty).asScala(Set)

answered Sep 11, 2020 at 10:09

Martijn

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