Is it possible for two classes to be data members of each other mutually?

Question

Is it possible for a class A to be a field of another class B and at the same time, for class B to be a field of Class A?

I have a scenario where I have two classes: Mat

Answer 1

Yes, Java actually supports cyclic dependencies between classes. So what you are asking is achievable but as the other answer pointed out it would cause some problems at construction time. I mean one constructor calling another might cause an overflow error. So instead you can do something like.

Match match = new Match();
Venue venue = new Venue();
match.setVenue(venue);
venue.setMatch(match);

In view of Garbage collection, If Match and Venue were to be referenced to each other and not by any other objects then they would be in a state of isolation ie Island of Isolation. They won't be eligible for garbage collection. I hope this helps.