@Override
    public Class<?> getColumnClass(int columnIndex) {
        switch (columnIndex) {
            case VENDOR:
                return String.class;
            case NUMBER:
                return Integer.class;
            case MODEL:
                return String.class;
            case NOTE:
                return String.class;
            case RECEIPT_DATE:
                return Date.class;
            default:
                return Object.class;
        }
    }