public boolean isCombo()
    {
        return getCOSObject().getFlag(COSName.FF, FLAG_COMBO);
    }
@Test
    void createListBox()
    {
        PDChoice choiceField = new PDListBox(acroForm);
        
        assertEquals(choiceField.getFieldType(), choiceField.getCOSObject().getNameAsString(COSName.FT));
        assertEquals("Ch", choiceField.getFieldType());
        assertFalse(choiceField.isCombo());
    }