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How to call methods from subclasses when we are defining the parent class

Hi,

I'm getting an error at base.getField2 -- i know that base is returning to me subclassA -- but how can i call the method of child based on base class.
getField2 doesn't have to exist in base class

        enum = enum::A        BaseClass base = BaseClass::newFromEnum(enum);        base.initFields(_line);        Table1.Field2 = base.getField2();  //how can i call the intended method

abstract class BaseClass{    str commonField;    abstract void initFields(str _line)    {    }    public str getCommonField()    {        return commonField;    }    public static BaseClass newFromEnum(Enum _enum)    {        EnumAtrribute enumAtrribute = new AMIVolkswagenInterfaceTypeAtrribute(_enum);        return SysExtensionAppClassFactory::getClassFromSysAttribute(classStr(BaseClass), enumAtrribute);    }}

[EnumAtrribute(Enum::A)]class SubClassA extends BaseClass{    str field1;    str field2    public void initFields(str _line)    {        field1            = subStr(_line, 1, 2);        field2            = subStr(_line, 73, 1);            }    public str getField2(str _field2 =  field2)    {        field2 = _field2;        return field2;    }}

[EnumAtrribute(Enum::B)]class SubClassB extends BaseClass{    str field1;    str field2;    str field3;    public void initFields(str _line)    {        field1            = subStr(_line, 3, 5);        field2            = subStr(_line, 9 , 10);        field3            = subStr(_line, 91 , 98);                   }    public str getField2(str _field2 =  field2)    {        field2 = _field2;        return field2;    }}

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