Once again, what's this code going to print to the console? Careful, it might be a trap!

{Admiral Ackbar}Empty!{}

Swee-heet! "Ackbar" isn't a key but a value, so nothing gets removed. Therefore, isEmpty() returns false and the contents of fleet are printed.

Argh, it was a trap! "Ackbar" isn't a key but a value, so nothing gets removed. Therefore, isEmpty() returns false and the contents of fleet are printed.