import java.util.Set;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
-import java.util.stream.Collectors;
public interface Manager extends Closeable {
.filter(File::isFile)
.map(File::getName)
.filter(file -> PhoneNumberFormatter.isValidNumber(file, null))
- .collect(Collectors.toList());
+ .toList();
}
String getSelfNumber();