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The equal function assumes that the second sequence is the same size as the first, so it does not need an ending iterator Because we pass srbegin() as the starting point for the second sequence, the effect of this call is to compare values from the back of s to values in the front The equal function will compare the first character in s with the last Then it will compare the second to the next to last, and so on This behavior is precisely what we want

The composite widget is used as a container for other widgets The widget s children are widgets contained within the bounds of the composite and resize themselves relative to it Useful APIs include:

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operates on a List instance to perform arbitrary computations on sublists The resulting API has a very high power-to-weight ratio A second technique for shortening overly long parameter lists is to create helper classes to hold aggregates of parameters Typically these helper classes are static member classes (Item 18) This technique is recommended if a frequently occurring sequence of parameters is seen to represent some distinct entity For example suppose you are writing a class representing a card game, and you find yourself constantly passing a sequence of two parameters representing a card's rank and its suit Your API, as well as the internals of your class, would probably be improved if you added a helper class to represent a card and replaced every occurrence of the parameter sequence with a single parameter of the helper class For parameter types, favor interfaces over classes Whenever an appropriate interface to define a parameter exists, use it in favor of a class that implements the interface For example, there is no reason ever to write a method that takes Hashtable on input use Map instead This lets you pass in a Hashtable, a HashMap, a TreeMap, a submap of a TreeMap, or any Map implementation yet to be written By using a class instead of an interface, you restrict your client to a particular implementation and force an unnecessary and potentially expensive copy operation if the input data happen to exist in some other form Use function objects (Item 22) judiciously There are some languages, notably Smalltalk and the various Lisp dialects, that encourage a style of programming rich in objects that represent functions to be applied to other objects Programmers with experience in these languages may be tempted to adopt a similar style in the Java programming language, but it isn't a terribly good fit The easiest way to create a function object is with an anonymous class (Item 18), but even that involves some syntactic clutter and has limitations in power and performance when compared to inline control constructs Furthermore, the style of programming wherein you are constantly creating function objects and passing them from method to method is out of the mainstream, so other programmers will have a difficult time understanding your code if you adopt this style This is not meant to imply that function objects don't have legitimate uses; they are essential to many powerful design patterns, such as Strategy [Gamma98, p 315] and Visitor [Gamma98, p 331] Rather, function objects should be used only with good reason.

getChildren() Returns an array containing the receiver s children layout() If the receiver has a layout, it asks the layout to set the size

As the last of our examples of character manipulation, let's write a function that finds Web addresses, called uniform resource locators (URLs), that are embedded in a string We might use such a function by creating a single string that holds the entire contents of a document The function would then scan the document and find all the URLs in it A URL is a sequence of characters of the form protocol-name: //resource-name where protocol-name contains only letters, and resource-name may consist of letters, digits, and certain punctuation characters Our function will take a string argument and will look for instances of :// in that string Each time we find such an instance, we'll look for the protocol-name that precedes it, and the resource-name that follows it Because we want our function to find all the URLs in its input, we'll want it to return a vector<string>, with one element for each URL The function executes by moving the iterator b through the string, looking for the characters :// that might be a part of a URL If we find these characters, it looks backward to find the protocol-name, and it looks forward to find the resource-name:

setLayout(Layout) Sets the layout that is associated with the receiver to be the argument, which may be null setTabList(Control[]) Sets the tabbing order for the specified controls to match the order in which they occur in the argument list

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