@Override
    public Class<?> getColumnClass(int columnIndex) {
        Class<?> c = null;
        switch(columnIndex) {
            case 0:
                c = Integer.class;
                break;
            case 1:
                c = String.class;
                break;
            case 2:
                c = Integer.class;
                break;
            case 3:
                c = Short.class;
                break;
            case 4:
                c = Short.class;
                break;
            case 5:
                c = String.class;
                break;
            default:
                c = String.class;
                break;
        }
        return c;
    }