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in the controller or view Next, the model needs to provide a way for the data to be persisted across sessions Finally, while the controller will have references to the model, the model should not reference the controller or view Instead, the controller registers itself with the model as a listener so that model changes are communicated to the controller using the observer pattern Using the guidelines above, there are two things that the Favorites model (see Section 723, View model, on page 295) currently doesn t have: the Favorites model has neither size and location data for the Favorite item nodes nor a notification system for model changes (see Figure 20 1) For the purposes of this example, the size and location data will be created by the FavoritesManager controller and not preserved across sessions While listeners can t be set up to listen to all types of model changes, FavoritesManager does support listening to the addition and removal of Favorite items: addFavoritesManagerListener(FavoritesManagerListener) removeFavoritesManagerListener(FavoritesManagerListener)

if (size == 0) { cout << endl << "You must enter your grades "Please try again" << endl; return 1; } "

The GEF controller is a collection of edit parts As new objects are added to the model, an edit part factory creates edit parts corresponding to the new model objects Each edit part is responsible for creating figures representing its model objects and giving itself characteristics by overriding methods which declare:

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We would expect the getAddCount method to return three at this point, but it returns six What went wrong Internally, HashSet's addAll method is implemented on top of its add method, although HashSet, quite reasonably, does not document this implementation detail The addAll method in InstrumentedHashSet added three to addCount and then invoked HashSet's addAll implementation using superaddAll This in turn invoked the add method, as overridden in InstrumentedHashSet, once for each element Each of these three invocations added one more to addCount, for a total increase of six: Each element added with the addAll method is double-counted We could fix the subclass by eliminating its override of the addAll method While the resulting class would work, it would depend for its proper function on the fact that HashSet's addAll method is implemented on top of its add method This self-use is an implementation detail, not guaranteed to hold in all implementations of the Java platform and subject to change from release to release Therefore, the resulting InstrumentedHashSet class would be fragile It would be slightly better to override the addAll method to iterate over the specified collection, calling the add method once for each element This would guarantee the correct result whether or not HashSet's addAll method were implemented atop its add method because HashSet's addAll implementation would no longer be invoked This technique, however, does not solve all our problems It amounts to reimplementing superclass methods that may or may not result in self-use, which is difficult, time-consuming, and error prone Additionally, it isn't always possible, as some methods cannot be implemented without access to private fields inaccessible to the subclass A related cause of fragility in subclasses is that their superclass can acquire new methods in subsequent releases Suppose a program depends for its security on the fact that all elements inserted into some collection satisfy some predicate This can be guaranteed by subclassing the collection and overriding each method capable of adding an element to ensure that the predicate is satisfied before adding the element This works fine until a new method capable of adding an element is added to the superclass in a subsequent release Once this happens, it becomes possible to add an illegal element to an instance of the subclass merely by invoking the new method, which is not overridden in the subclass This is not a purely theoretical problem Several security holes of this nature had to be fixed when Hashtable and Vector were retrofitted to participate in the Collections Framework Both of the above problems stem from overriding methods You might think that it is safe to extend a class if you merely add new methods and refrain from overriding existing methods While this sort of extension is much safer, it is not without risk If the superclass acquires a.

child edit parts (see Section 2033, Child EditParts, on page 737) connections (see Section 2034, Connection EditParts, on page 739 and Section 2044, Connection Figures, on page 751) figures (see Section 204, GEF Figures, on page 743) policies (see Section 20653, GEF Policies, on page 765)

We can detect this state of affairs by checking whether size is zero If it is, the most sensible action is to complain and stop the program We do so by returning 1 to indicate failure As discussed in 0, the system presumes that if main returns 0, the program succeeded Returning anything else has an implementation-defined meaning, but most implementations treat any nonzero value as failure Now that we have verified that we have data, we can begin computing the median The first part of doing so is to sort the data, which we do by calling a library function:

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