package me.escoffier.lab.chapter5; import io.reactivex.Observable; import java.io.File; import java.nio.file.FileVisitResult; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.SimpleFileVisitor; import java.nio.file.attribute.BasicFileAttributes; public class Code8 { private static final Path DIRECTORY = new File("src/main/resources/super").toPath(); public static void main(String[] args) { getFileNames().subscribe(System.out::println, Throwable::printStackTrace); } private static Observable<String> getFileNames() { return Observable.create(emitter -> { Files.walkFileTree(DIRECTORY, new SimpleFileVisitor<Path>() { @Override public FileVisitResult visitFile(Path path, BasicFileAttributes attr) { // ... return FileVisitResult.CONTINUE; } }); // ... }); } }