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One solution to these problems is to create a special class that contains all the values needed to initialize a class, and to have only one parameter to the method: that class type. That way, you only pass around one object with all the relevant dependencies. (This is also known as a parameter object refactoring.) This can get out of hand pretty quickly, with dozens of properties on an object; but it s possible. Another possible solution to these problems is using inversion of control (IoC) containers. You can think of IoC containers as smart factories for your objects (although they are much more than that). A couple of well-known containers of this type are Spring.NET and Castle Windsor. Both provide special factory methods that take in the type of object you d like to create and any dependencies that it needs, and then initialize the object using special configurable rules such as what constructor to call, what properties to set in what order, and so on. They re powerful when put to use on a complicated composite object hierarchy where creating an object requires creating and initializing objects several levels down the line. If your class needs an ILogger interface at its constructor, for example, you can configure such a container object to always return the same ILogger object that you give it, when resolving this interface requirement. The end result of using containers is usually simpler handling and retrieving of objects, and less worry about the dependencies or maintaining the constructors.

Mark and Scott are two of the smartest people I know, and they do an excellent job explaining the concepts behind the Objective-C language Because that book was written as a sequel to this one, you should feel right at home What s Objective-C got that regular old C doesn t In a word, objects Just as a struct brings variables together under a single name, an object can bring together variables as well as functions, binding them together under a single class name Objects are incredibly powerful Every part of the Mac user interface has a set of objects associated with it Want to create a new window Just create a new window object, and the object will take care of all the housekeeping associated with maintaining a window.

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Suppose certain customers want to deviate from this default and swap the order. Rather than provide a separate properties file for each customer, we could use the <replaceregexp> task to maintain a single file and note the exceptions (perhaps in a customer-specific properties file loaded in Ant), as the following code illustrates:

What if you have a set of files that you want to pass in as parameters to some native program How can you do it If you know in advance the list of files, you can just repeat the task, but that makes maintenance worse. You could use a special task <antcall> to call targets dynamically; this complex task has not been covered yet because it has many subtle issues. For the special problem of passing a list of files to an external executable, there is a better solution: <apply>. This task takes a fileset and hands it off to the named application, either in one go or one at a time. Apply is implemented as a subclass of <exec>, so all the attributes of that task can be used with <apply>, with the additional feature of bulk execution. Let s start with an example. Suppose we have a native program that converts XML files to PDF, which takes two command-line parameters: the path to an XML file, and a path to the resultant PDF file. Before we go crazy and accidentally run our program destructively, let s first just have it output to the screen what it would do. This is a nice way to develop the use of <apply> in your build files so that you can see what it s going to, giving you the chance to tweak the parameters.

The window object s functions will draw the contents of the window for you, perhaps communicating with other objects to get them to draw themselves within the window There are pull-down menu objects, icon objects, scrollbar objects, file objects, even objects that can organize other objects Chances are, if you can imagine it, there s a set of objects that will help you build it..

Since a string is made of characters, the length of the string is also the number of characters it has in it. Actually, length is a string property. You use it to get a string s character count. Here is how you do that: length of "rope" result: 12 The result is a number, in this case the number 4, since the string "rope" has four characters. In addition to the length property, you can also use the count command to get the number of characters of a string. Like length, the count command can work on strings, lists, and records: count "Hello world!" result: 12

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