low cost private jsp mysql

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low cost private jsp mysql low cost private jsp mysql Say we decided to change Song to store the duration in milliseconds. Suddenly,KaraokeSong would start reporting ridiculous values. The idea of a karaoke version of ``My Way'' that lasts for 3750 minutes is just too frightening to consider. We get around this problem by having each class handle its own internal state. When KaraokeSong#to_s is called, we'll have it call its parent's to_s method to get the song details.

low cost private jsp mysql It will then append to this the lyric information and return the result. The trick here is the Ruby keyword ``super''. When you invoke super with no arguments, Ruby sends a message to the current object's parent, asking it to invoke a method of the same name as the current method, and passing it the parameters that were passed to the current method. Now we can implement our new and improved to_s. class KaraokeSong < Song # Format ourselves as a string by appending # our lyrics to our parent's #to_s value.

low cost private jsp mysql def to_s super + " [#{@lyrics}]" end end aSong = KaraokeSong.new("My Way", "Sinatra", 225, "And now, the...") aSong.

low cost private jsp mysql to_s » "Song: My Way--Sinatra (225) [And now, the...]" We explicitly told Ruby that KaraokeSong was a subclass of Song, but we didn't specify a parent class for Song itself. If you don't specify a parent when defining a class, Ruby supplies class Object as a default.

low cost private jsp mysql

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low cost private jsp mysql