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An object class provides the implementation of an object. It consists of class methods, routines that perform functions for the class as a whole, and object methods, routines that perform functions for individual objects (also called object instances). It may also contain package variables, or in objectoriented terminology, class attributes. The details of the class are hidden behind the interface provided by these methods, in the same way that a functional module hides its implementation from us. All object classes contain at least one important class method: a constructor that generates new object instances. In addition, it may have a destructor, for tidying up associated resources when an object instance is destroyed. Perl implements object classes with packages. In fact, a package is just an object class by another name. This basic equivalence is the basis for much of Perl s simple and obvious approach to objects in general. A class method is just a subroutine that takes a package name as its first argument, and an object method is a subroutine that takes an object name as its first argument. Perl automatically handles the passing of this first argument when we use the arrow (->) operator.

NOTE: EncodedImage uses 32-bit fixed point decimal numbers as its scale factors. The BlackBerry provides support for numbers in this format in the net.rim.device. api.math.Fixed32 class. Fixed32 enables you to store a decimal number in a 32-bit int; 16 bits are used for the integer portion and 16 bits are used for the decimal portion. Addition and subtraction operations on Fixed32 numbers are faster than on floats or doubles, so they can be a good choice for those types of decimal arithmetic. When using Fixed32 numbers, remember to convert back and forth from regular ints; that s what the toFP method does. You also must use Fixed32 methods for multiplying and dividing Fixed32 format numbers. Using the * and / operators produces nonsensical results, but you can use the standard Java + and operators for addition and subtraction. For EncodedImage, a scaling factor of between 0 and 1 means scale up; a scaling factor of greater than 1 means scale down. We can get the correct scaling factor for our image by dividing the image s width by the BlackBerry display s width. To be completely precise, we could check the image and display height, too, but I ll leave that as an exercise for you. When you run the FileConnection application and select the same image now, you ll get a much better picture (see Figure 6-12).

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Objects are individual instances of an object class, consisting of an opaque value representing the state of the object but abstracting the details. Because the object implicitly knows what class it belongs to, we can call methods defined in the object class through the object itself, in order to affect the object s state. Objects may contain, within themselves, different individual values called object attributes (or sometimes instance attributes). Perl implements objects through references; the object s state is held by whatever it is that the reference points to, which is up to the object s class. The reference is told what class it belongs to with the bless function, which marks the references as belonging to a particular class. Since a class is a package, method calls on the object (using ->) are translated by Perl into subroutine calls in the package. Perl passes the object as the first argument so the subroutine knows which object to operate on. The storage of object attributes is up to the actual data type used to store them; typically the data type is a hash variable, and the attributes are simply keys of the hash. Of course, the point of object orientation is that the user of an object does not need to know anything about this.

One important concept of object-oriented programming, and the place where objects score significant gains over functional programming, is inheritance An object s classes may inherit methods and class attributes from parent classes, in order to provide some or all of their functionality, a technique also known as subclassing This allows an object class to implement only those features that differentiate it from a more general parent without having to worry about implementing the classes contained in its parent Inheritance encourages code reuse, allowing us to use tried and tested objects to implement our core features rather than reinventing the wheel for each new task This is an important goal of any programming environment, and one of the principal motivations behind using object-oriented programming Multiple inheritance occurs when a subclass inherits from more than one parent class.

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