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Despite being small, this function uses a fair bit of new material First is the use of the static storage class specifier Local variables that are declared to be static are preserved across invocations of the function Thus, we will create and initialize the string url_ch only on the first call to not_url_char Subsequent calls will use the object that the first call created Because url_ch is a const string, its value will not change once we have initialized it The not_url_char function also uses the isalnum function, which the <cctype> header defines This function tests whether its argument is an alphanumeric character (a letter or a digit) Finally, find is another algorithm that we haven't used yet It is similar to find_if, except that instead of calling a predicate, it looks for the specific value given as its third argument As with find_if, if the value that we want is present, the function returns an iterator denoting the first occurrence of the value in the given sequence If the value is not found, then find returns its second argument With this information in hand, we can now understand the not_url_char function Because we negate the value of the entire expression before we return it, not_url_char will yield false if c is a letter, a digit, or any of the characters in

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add(String) Adds the argument to the end of the receiver s list addSelectionListener(SelectionListener) Adds the listener to the collection of listeners that will be notified when the receiver s selection changes by sending it one of the messages defined in the SelectionListener interface

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dispense these instances repeatedly so as to avoid creating unnecessary duplicate objects The BooleanvalueOf(boolean) method illustrates this technique: It never creates an object This technique can greatly improve performance if equivalent objects are requested frequently, especially if these objects are expensive to create The ability of static factory methods to return the same object from repeated invocations can also be used to maintain strict control over what instances exist at any given time There are two reasons to do this First, it allows a class to guarantee that it is a singleton (Item 2) Second, it allows an immutable class to ensure that no two equal instances exist: aequals(b) if and only if a==b If a class makes this guarantee, then its clients can use the == operator instead of the equals(Object) method, which may result in a substantial performance improvement The typesafe enum pattern, described in Item 21, implements this optimization, and the Stringintern method implements it in a limited form A third advantage of static factory methods is that, unlike constructors, they can return an object of any subtype of their return type This gives you great flexibility in choosing the class of the returned object One application of this flexibility is that an API can return objects without making their classes public Hiding implementation classes in this fashion can lead to a very compact API This technique lends itself to interface-based frameworks, where interfaces provide natural return types for static factory methods For example, the Collections Framework has twenty convenience implementations of its collection interfaces, providing unmodifiable collections, synchronized collections, and the like The great majority of these implementations are exported via static factory methods in a single, noninstantiable class (javautilCollections) The classes of the returned objects are all nonpublic The Collections Framework API is much smaller than it would be if it had exported twenty separate public classes for the convenience implementations It is not just the bulk of the API that is reduced, but the conceptual weight The user knows that the returned object has precisely the API specified by the relevant interface, so there is no need to read additional class documentation Furthermore, using such a static factory method mandates that the client refer to the returned object by its interface rather than by its implementation class, which is generally a good practice (Item 34) Not only can the class of an object returned by a public static factory method be nonpublic, but the class can vary from invocation to invocation depending on the values of the parameters to the static factory Any class that is a subtype of the declared return type is permissible The class of the returned object can also vary from release to release, for enhanced software maintainability The class of the object returned by a static factory method need not even exist at the time the class containing the static factory method is written Such flexible static factory methods form the basis of service provider frameworks like the Java Cryptography Extension (JCE) A service provider framework is a system wherein providers make multiple implementations of an API available to users of the framework A mechanism is provided to register these implementations, making them available for use Clients of the framework use the API without worrying about which implementation they are using.

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