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private jsp servlet private jsp servlet 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. 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.

private jsp servlet ) For now, don't worry too much about theinitialize method; we'll talk about that super call later. 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.

private jsp servlet aSong = KaraokeSong.new("My Way", "Sinatra", 225, "And now, the...") aSong.

private jsp servlet 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. When Ruby compiles the method invocation aSong.to_s, it doesn't actually know where to find the method to_s. Instead, it defers the decision until the program is run. At that time, it looks at the class of aSong.

private jsp servlet

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private jsp servlet