gist2.java

public class GenreFilter extends Filter<Integer> implements Filterable {

    @Override
    public ArrayList<Item> applyFilter(ArrayList<Item> arrayList) {
        if (value == null) {
            return arrayList;
        } else {
            ArrayList<Item> newArrayList = new ArrayList<>();
            for (int i = 0; i < arrayList.size(); i++) {
                int tmp = arrayList.get(i).getGenreID();
                if (tmp == value)
                    newArrayList.add(arrayList.get(i));
            }
            return newArrayList;
        }
    }
}