/**
* specify two Caves as mutual neighbours; Each is an exit of the other.
*
* <p>This requires Cave.addExit(Cave)
*
* @param from
* @param to
*/
private void join2(Cave from, Cave to) {
from.addExit(to);
to.addExit(from);
}
/**
* specify one Cave as an exit from another Cave.
*
* <p>This requires Cave.addExit(Cave)
*
* @param from
* @param to
*/
private void join(Cave from, Cave to) {
from.addExit(to);
}
