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private jsp servlet private jsp servlet 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. aSong = Song.

private jsp servlet 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. Our experience tells us that during development we'll be printing out the contents of a Song object many times, and inspect's default formatting leaves something to be desired.

private jsp servlet Fortunately, Ruby has a standard message, to_s, which it sends to any object it wants to render as a string. Let's try it on our song. aSong = Song.new("Bicylops", "Fleck", 260) aSong.to_s » "#<Song:0x401b499c>" That wasn't too useful---it just reported the object id.

private jsp servlet So, let's override to_s in our class. As we do this, we should also take a moment to talk about how we're showing the class definitions in this book. In Ruby, classes are never closed: you can always add methods to an existing class. This applies to the classes you write as well as the standard, built-in classes. All you have to do is open up a class definition for an existing class, and the new contents you specify will be added to whatever's there.

private jsp servlet

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private jsp servlet