By Kevin Lano
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Extra info for Advanced Systems Design with Java, UML and MDA
Cannot be executed if C is abstract). Non-abstract classes are termed concrete. 15): for each instance of the subclass there is (it is) a corresponding instance of the superclass (cf the 'super' keyword in Java), and each superclass instance may correspond to (may also be) an instance of the subclass. Abstract superclasses may have abstract operations, operations for which a specific definition cannot be given in the superclass, instead the individual subclasses will give their own definitions.
Exercises 39 a textual description, possibly a photograph, and a size specification (width and depth in metres and feet). I1 What are the multiplicities of the role ends (both called spouses) of an association representing the relationship of marriage (under UK or USA law), between subclasses Male and Female of Person? What additional constraint should be added if the association is viewed as a self-association on Person? Chapter 3 The Object Constraint Language In this chapter we describe the UML constraint language, OCL, and a subset, LOCA, of OCL.
Express invariants of classes - properties relating the attributes and rolenames of the class, which are expected to be true for each object of the class, at all times when the object is not executing a method. 2. Express preconditions of operations of a class - properties of the object responding to the operation, and of the operation input parameters, which are required to be true when it starts execution. 3. Express postconditions of operations of a class - properties of the object responding to the operation, and of the operation output parameter result, if present, which are required to be true when the operation completes execution.