Vaadin 7 Field is dead, what in vadim 8 ?

In Vaadin 7 i was using Field Super Class to get the TexField, DateField Object Value.

Now the Field Class is not present in Vaadin8, what can i do to get the value of some different fields type without refer to them with them Class but with a super class that is trasversal to them ?

For instance

Map<String, Object> fieldMap = new HashMap<String, Object>();

TextField tf = new TextField();
tf.setValue("Test");

fieldMap.put("testField1", tf);

Field field = fieldMap.gett("testField1");

Object value = field.getValue();

Thanks
 

https://vaadin.com/api/8.0.5/com/vaadin/data/HasValue.html ?

Thanks