How can I call collect(Collectors.toList()) on a Java 8 Stream in Kotlin?

Question

I have the some code:

directoryChooser.title = \"Select the directory\"
val file = directoryChooser.showDialog(null)
if (file != null) {
    var files = File         


        

Answer 1

This is another work around if you are for some reason stuck on older beta version of Kotlin which requires a more brutal workaround...

Workaround #3: (ugly, an old workaround ONLY for old versions of Kotlin)

Add this Java class to your project:

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class CollectFix {
    public static  List streamToList(Stream s) {
        return s.collect(Collectors.toList());
    }
}

And this one Kotlin extension function:

fun  Stream.toList(): List = CollectFix.streamToList(this)

And then any time you have this case, use this new extension:

Files.list(Paths.get(file)).filter { /* filter clause */ }.toList()