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cheap jsp web site hosting cheap jsp web site hosting 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. When our jukebox plays a karaoke song, the lyrics should flow across the screen on the front of the jukebox in time with the music.

cheap jsp web site hosting An approach to this problem is to define a new class, KaraokeSong, which is just like Song, but with a lyric track. class KaraokeSong < Song def initialize(name, artist, duration, lyrics) super(name, artist, duration) @lyrics = lyrics end end The ``< Song'' on the class definition line tells Ruby that a KaraokeSong is a subclass of Song. (Not surprisingly, this means that Song is a superclass of KaraokeSong. People also talk about parent-child relationships, so KaraokeSong's parent would be Song.) For now, don't worry too much about theinitialize method; we'll talk about that super call later.

cheap jsp web site hosting Let's create a KaraokeSong and check that our code worked. (In the final system, the lyrics will be held in an object that includes the text and timing information. To test out our class, though, we'll just use a string. This is another benefit of untyped languages---we don't have to define everything before we start running code. aSong = KaraokeSong.

cheap jsp web site hosting new("My Way", "Sinatra", 225, "And now, the...") aSong.to_s » "Song: My Way--Sinatra (225)" Well, it ran, but why doesn't the to_s method show the lyric? The answer has to do with the way Ruby determines which method should be called when you send a message to an object.

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