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low cost private jsp hosting services low cost private jsp hosting services So it seems like a good idea to start off by setting up a Ruby class that represents things that are songs. We know that a real song has a name, an artist, and a duration, so we'll want to make sure that the song objects in our program do, too. We'll start off by creating a basic class Song,[As we mentioned on page 9, class names start with an uppercase letter, while method names start with a lowercase letter.] which contains just a single method, initialize. class Song def initialize(name, artist, duration) @name = name @artist = artist @duration = duration end end initialize is a special method in Ruby programs.

low cost private jsp hosting services When you call Song.new to create a new Song object, Ruby creates an uninitialized object and then calls that object's initializemethod, passing in any parameters that were passed to new. This gives you a chance to write code that sets up your object's state. For class Song, the initialize method takes three parameters. These parameters act just like local variables within the method, so they follow the local variable naming convention of starting with a lowercase letter.

low cost private jsp hosting services Each object represents its own song, so we need each of our Song objects to carry around its own song name, artist, and duration. This means we need to store these values as instance variableswithin the object. In Ruby, an instance variable is simply a name preceded by an ``at'' sign (``@''). In our example, the parameter name is assigned to the instance variable @name, artist is assigned to @artist, and duration (the length of the song in seconds) is assigned to @duration. Let's test our spiffy new class.

low cost private jsp hosting services aSong = Song.new("Bicylops", "Fleck", 260) aSong.inspect » "#<Song:0x401b4924 @duration=260, @artist=\"Fleck\", @name=\"Bicylops\">" Well, it seems to work. By default, the inspect message, which can be sent to any object, dumps out the object's id and instance variables. It looks as though we have them set up correctly.

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