ItemTypesLists.java:79: error: incompatible types: Market cannot be converted to Zip
        return ZipList.get(index);
                          ^
ItemTypesLists.java:83: error: incompatible types: Market cannot be converted to TF
        return TFList.get(index);

I Have a market class with extends of TF for t/f and Zip. Purpose is to read a data file and split them between the classes. One could contain a zip code or a false/true input at the end.

Nevada, 35000, true
Oregon, 12500, 97001
California, 38000
Texas, 25000
Florida, 15000, false
                        

public class ItemTypesLists {
    private ItemOrderedList ZipList;
    private ItemOrderedList TFList;

    public ItemTypesLists() {
        ZipList = new ItemOrderedList();
        TFList = new ItemOrderedList();
    }

    public void add(Object element) {
        if (element instanceof Zip) {
            ZipList.add((Zip) element);
        } else if (element instanceof TF) {
            TFList.add((TF) element);
        }
    }

    public int sizeOfZip() {
        return ZipList.size();
    }

    public int sizeOfTF() {
        return TFList.size();
    }

    public void displayZip() {
        ZipList.display();
    }

    public void displayTF() {
        TFList.display();
    }

    public boolean add(int index, Market element) {
        if (element instanceof Zip) {
            return ZipList.add(index,(Zip) element);
        } else if (element instanceof TF) {
            return TFList.add(index, (TF) element);
        }
        return false;
    }

    public boolean remove(Market target) {
        if (target instanceof Zip) {
            return ZipList.remove((Zip) target);
        } else if (target instanceof TF) {
            return TFList.remove((TF) target);
        }
        return false;
    }

    public boolean removeZip(Zip index) {
        return ZipList.remove(index);
    }

    public boolean removeTF(TF index) {
        return TFList.remove(index);
    }

    public int indexOf(Market target) {
        if (target instanceof Zip) {
            return ZipList.indexOf((Zip) target);
        } else if (target instanceof TF) {
            return TFList.indexOf((TF) target);
        }
        return -1;
    }

    public Zip getZip(int index) {
        return ZipList.get(index);
    }

    public TF getTF(int index) {
        return TFList.get(index);
    }
}