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affordable private java pages Their behavior and performance are precisely analogous to HashSet, TreeSet, and LinkedHashSet, as described in The Set Interface section. Also, Hashtable was retrofitted to implement Map.Comparison to Hashtable If you've used Hashtable, you're already familiar with the general basics of Map. (Of course, Map is an interface, while Hashtable is a concrete implementation.) The following are the major differences: Map provides Collection views instead of direct support for iteration via Enumeration objects.
affordable private java pages Collection views greatly enhance the expressiveness of the interface, as discussed later in this section. Map allows you to iterate over keys, values, or key-value pairs; Hashtable does not provide the third option. Map provides a safe way to remove entries in the midst of iteration; Hashtable did not. Finally, Map fixes a minor deficiency in the Hashtable interface. Hashtable has a method called contains, which returns true if the Hashtable contains a given value.
affordable private java pages Given its name, you'd expect this method to return true if the Hashtable contained a given key, because the key is the primary access mechanism for a Hashtable. The Map interface eliminates this source of confusion by renaming the method containsValue. Also, this improves the interface's consistency — containsValue parallels containsKey.Map Interface Basic Operations The basic operations of Map (put, get, containsKey, containsValue, size, and isEmpty) behave exactly like their counterparts in Hashtable. The following program generates a frequency table of the words found in its argument list.
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