You cannot change the length of a Collection (by adding or removing items)
while iterating through it.
You can
- make a copy of the account collections, delete accounts from that copy during
iteration, clear the account collection and insert all elements of the copy
into the account collection *uff*
- insert all accounts to delete into a toDelete collection during iteration,
and then iterate over the toDelete collection and delete items from the account
collection.
Confused? Here's an example for the second way:
public void filter(...) {
| Collection<Accounts> toDelete = new ArrayList<Accounts>();
| for (Account a: accounts)
| if(accounts.notAccessibleBy(user)
| toDelete.add(a);
| else if (accounts.accessibleBy(user)
| continue;
| else
| toDelete.add(a);
|
| for (Account a: toDelete)
| accounts.remove(a);
| }
btw: The checks you make (notAccessiblyBy, accessibleBy) seem to be a bit weird
;). It looks like you want to keep ALL accounts in the collection or delete ALL
of them. Wouldn't it work like this?
public void filter(...) {
| if (accounts.notAccessibleBy(user))
| accounts.clear();
| }
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