I know it is only an example, but you don't want to use Object as class name, because it is already a fundamental class in Java.
Perhaps you want another class, holding the array of objects, and providing the value (that's better if you use an array list and dynamically add objects: you recompute the sum only if the list is changed, as long as the field is immutable). Or just compute it once all objects are created.

Oh, good idea like the classic tutorial "cards" and "deck"... I'll try that. The class name is Cortes (cuts in portuguese) maybe it should be Corte in singular...