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The notion of return-type substitutability summarizes the ways in which return types may vary among methods that override each other Note that this de nition supports covariant returns - that is, the specialization of the return type to a subtype (but only for reference types) Also note that unchecked conversions are allowed as well This is unsound, and requires an unchecked warning whenever it is used; it is a special allowance is made to allow smooth migration from non-generic to generic code

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/** * Used between DirNode and DirModel, to manage the list of object classes * that are to be considered containers * * @return a hash table containing object classes to be considered containers */ public Hashtable getContainers(); /** * Informs the tree that a particular node s structure * has changed and its view needs to be updated * * @param node the node that has changed **/ public void fireTreeStructureChanged( IDirNode node ); }

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If we had created unordered dicts the same way and asked for their keys, the order of the returned keys would be arbitrary But for ordered dictionaries, we can rely on the keys to be returned in the same order they were inserted So for these examples, if we wrote list(dkeys()), we are guaranteed to get the list ['z', 'e', 'k'], and if we wrote list(taskskeys()), we are guaranteed to get the list [8031, 4027, 5733] One other nice feature of ordered dictionaries is that if we change an item s value that is, if we insert an item with the same key as an existing key the order is not changed So if we did tasks[8031] = "Daily backup", and then asked for the list of keys, we would get exactly the same list in exactly the same order as before If we want to move an item to the end, we must delete it and then reinsert it We can also call popitem() to remove and return the last key value item in the ordered dictionary; or we can call popitem(last=False), in which case the rst item will be removed and returned Another, slightly more specialized use for ordered dictionaries is to produce sorted dictionaries Given a dictionary, d, we can convert it into a sorted dictionary like this: d = collectionsOrderedDict(sorted(ditems())) Note that if we were to insert any additional keys they would be inserted at the end, so after any insertion, to preserve the sorted order, we would have to re-create the dictionary by executing the same code we used to create it in the rst place Doing insertions and re-creating isn t quite as inef cient as it sounds, since Python s sorting algorithm is highly optimized, especially for partially sorted data, but it is still potentially expensive In general, using an ordered dictionary to produce a sorted dictionary makes sense only if we expect to iterate over the dictionary multiple times, and if we do not expect to do any insertions (or very few), once the sorted dictionary has.

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programming style where rare and otherwise truly exceptional conditions are documented in this way The prede ned exceptions that are not checked in this way are those for which declaring every possible occurrence would be unimaginably inconvenient: Exceptions that are represented by the subclasses of class Error, for example OutOfMemoryError, are thrown due to a failure in or of the virtual machine Many of these are the result of linkage failures and can occur at unpredictable points in the execution of a program Sophisticated programs may yet wish to catch and attempt to recover from some of these conditions

In the previous subsection the Point class included a distance_from_origin() method, and the Circle class had the area(), circumference(), and edge_distance_from_origin() methods All these methods return a single float value, so from the point of view of a user of these classes they could just as well be data attributes, but read-only, of course In the ShapeAltpy le alternative implementations of Point and Circle are provided, and all the methods mentioned here are provided as properties This allows us to write code like this:

TreePanel TreePanel (Figure 10-8) catches and handles mouse, key, and tree selection events on the JTree it manages:

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