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private jsp servlet private jsp servlet This is great for our purposes. As we go through this chapter, adding features to our classes, we'll show just the class definitions for the new methods; the old ones will still be there. It saves us having to repeat redundant stuff in each example. Obviously, though, if you were creating this code from scratch, you'd probably just throw all the methods into a single class definition. Enough detail! Let's get back to adding a to_s method to our Song class.

private jsp servlet class Song def to_s "Song: #{@name}--#{@artist} (#{@duration})" end end aSong = Song.new("Bicylops", "Fleck", 260) aSong.to_s » "Song: Bicylops--Fleck (260)" Excellent, we're making progress. However, we've slipped in something subtle. We said that Ruby supports to_s for all objects, but we didn't say how.

private jsp servlet The answer has to do with inheritance, subclassing, and how Ruby determines what method to run when you send a message to an object. This is a subject for a new section, so....

private jsp servlet Inheritance and Messages Inheritance allows you to create a class that is a refinement or specialization of another class. For example, our jukebox has the concept of songs, which we encapsulate in class Song. Then marketing comes along and tells us that we need to provide karaoke support. A karaoke song is just like any other (there's no vocal on it, but that doesn't concern us). However, it also has an associated set of lyrics, along with timing information.

private jsp servlet

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private jsp servlet