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low cost private jsp pages For example, you might want to access the duration in minutes and fractions of a minute, rather than in seconds as we've been doing. class Song def durationInMinutes @duration/60.0 # force floating point end def durationInMinutes=(value) @duration = (value*60).to_i end end aSong = Song.new("Bicylops", "Fleck", 260) aSong.
low cost private jsp pages durationInMinutes » 4.333333333 aSong.durationInMinutes = 4.2 aSong.duration » 252 Here we've used attribute methods to create a virtual instance variable.
low cost private jsp pages To the outside world, durationInMinutes seems to be an attribute like any other. Internally, though, there is no corresponding instance variable. This is more than a curiosity. In his landmark book Object-Oriented Software Construction , Bertrand Meyer calls this the Uniform Access Principle. By hiding the difference between instance variables and calculated values, you are shielding the rest of the world from the implementation of your class.
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