<Question about Java code convert to Kotlin relate...

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[user]

Question about Java code convert to Kotlin related to Firebase
I am writing Chatroom App and now I want to convert runnable Android Java code to Kotlin code. I try to assign parser as Null Safety by adding "?". However, I cannot compile the code.

Java version:

mFirebaseDatabaseReference = FirebaseDatabase.getInstance().getReference();
SnapshotParser parser = new SnapshotParser() {
@Override
public FriendlyMessage parseSnapshot(DataSnapshot dataSnapshot) {
FriendlyMessage friendlyMessage = dataSnapshot.getValue(FriendlyMessage.class);...