Best way to determine what objects has been selected in a Collection?

Question

Hi all
I´m currently developing an application where a user can create a PDF based on the choices made from multiple collections.
Each collection contatins 10-50 items, and there are about 8 different collections with objects.
Checkboxes are used to select items from these collections.
I´m wondering how I would best determine what choices have been made, and if would be good to remove all objects from
a collection that has NOT been chosen?
Currently, it looks like this (exemple for one collection, but same solution is used for all collections)
private Collection<Texture> textureList = new ArrayList<Texture>();
private ArrayList<Texture> textureResult = new ArrayList<Texture>();
          for (Texture t : textureList) {
               if (t.isSelected()) {
                    textureResult.add(t);
          }After this iteration, textureResult is used to create the PDF.
This PDF contains lists with dynamic frames, so I need to now how many
items was selected before creating the PDF.
Wondering if this is the best/most efficient way to do this though?
Maybe it doesn´t matter all that much with lists this small, but I´m still curios :-)
I guess you could do something like this aswell
          while (textureList.iterator().hasNext()) {
               Texture t = (Texture) textureList.iterator().next();
               if (!t.isSelected()) {
                    textureList.iterator().remove();
          }Any suggetions?

Answer 1

Dallastower wrote:
I´m wondering how I would best determine what choices have been made,Are you asking how to determine which boxes have been checked? Or do you know how to do that and you're asking how to associate those boxes with items in your Collections? Or do you know how to do that and you're asking how to keep track of those selected items in the Collection?
I don't do GUIs, so I can't help with the first two, but for the third, you could create a new collection holding just the selected ones, or remove the unselected ones from the original Collection.
and if would be good to remove all objects from
a collection that has NOT been chosen?That's entirely up to you. If you create the original Collection when the user makes his selection, and only need it to survive one round of selection, that may be fine. But if you need to get back to the original collection later, and it's expensive to create, then you might want to just create a second collection and add items from the original to it if they're selected.