import lombok.RequiredArgsConstructor;
import java.util.*;
+import java.util.stream.Stream;
@RequiredArgsConstructor
return Optional.ofNullable(chatrooms.get(id));
}
- public Collection<Chatroom> list()
+ public Stream<Chatroom> list()
{
- return chatrooms.values();
+ return chatrooms.values().stream();
}
}