In a UML diagram when you create an instance of a subclass do you usually include the implicit construction of the superclass prior to the sub class constructor?
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In a UML diagram when you create an instance of a subclass do you usually include the implicit construction of the superclass prior to the sub class constructor?
I usually wouldn’t include it. The purpose of the UML sequence diagram is to show what happens between components. It shouldn’t be read isolated from other parts of a design, so if a reader is unsure about what any of the components is (i.e. an instance of the subclass and the superclass), he or she should look into the – hopefully – accompanying class diagram.