Android game rpg inventory system

Question

I am using an ArrayList as my \"inventory\". I am having trouble figuring out a way to add multiples of the same item without taking up a spot in the \"inventory\". For exam

Answer 1

Similar to aioobe's solution, you can use TObjectIntHashMap.

TObjectIntHashMap bag = new TObjectIntHashMap();

// to add `toAdd`
bag.adjustOrPutValue(item, toAdd, toAdd);

// to get the count.
int count = bag.get(item);

// to remove some
int count = bag.get(item);
if (count < toRemove) throw new IllegalStateException();
bag.adjustValue(item, -toRemove);

// to removeAll
int count = bag.remove(item);

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You can create a multiples class.

class MultipleOf {
    int count;
    final T t;
}

List bag = new ArrayList();
bag.add(new Sword());
bag.add(new MultipleOf(5, new Potion());

Or you can use a collection which records multiples by count.

e.g. a Bag

Bag bag = new HashBag() or TreeBag();
bag.add(new Sword());
bag.add(new Potion(), 5);
int count = bag.getCount(new Potion());