By Mark Priestley
This article appears to be like on the layout of computing courses utilizing the ideas of object-oriented layout and UML. It covers modelling strategies and notation intimately, supported via routines all through. it's appropriate for either Java and C++ clients.
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Additional resources for Practical Object-Oriented Design with UML
Example text
9 Message passing in the hierarchy In this interaction, assembly objects work out their cost by sending the same message, namely 'cost', to all their components. As explained above, the actual processing that is carried out when this message is received will depend on whether it has been sent to an assembly or a part object. The object sending the message does not know, and in fact need not know, whether a particular component is a part or an assembly. It simply sends the message and relies on the receiving object interpreting it in an appropriate manner.
The basic responsibility of these objects will be to record which elements appear on the diagram. The initial state of the editor, then, will include a single diagram object, corresponding to the 'new, empty diagram1 mentioned above. An important fact about this and any other diagram is that it is one of the diagrams being manipulated by the diagram editor. To model this fact, it is natural to introduce an object representing the diagram editor itself. One of the responsibilities of this object is to keep track of the diagrams that the user has created.
The properties of designs arrived at in this way need to be evaluated carefully, however. 1 Assume that the following lines of code are executed. 02); CatalogueEntry spoke = new CatalogueEntry("Spoke",47737, 0,95); Part screwl = new Part(screw); Part screw2 = new Part(screw); Part theSpoke = new Part(spoke); (a) Draw a diagram showing theobjects that have been created, their data members and the links between them. add(theSpoke); Draw a diagram showing the objects involved in the assembly a after these lines have executed, and the links between them.