private Integer getSumOwed() {
Integer sumOwed = 0;
for (Balance creditor : self.creditors()) {
sumOwed += creditor.getBalance() < 0 ? -creditor.getBalance() : 0;
}
return sumOwed;
}
public boolean canFindUnpaidCreditor() {
// Dynamic Role binding (happens *during* enactment)
Creditor = null;
for (Balance creditorCandidate : Bank.getCreditors()) {
if (creditorCandidate.getBalance() < 0) {
Creditor = creditorCandidate;
break;
}
}
return Creditor != null;
}