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private jsp servlets private jsp servlets However, Ruby classes can include the functionality of any number of mixins (a mixin is like a partial class definition). This provides a controlled multiple-inheritance-like capability with none of the drawbacks. We'll explore mixins more beginning on page 98. So far in this chapter we've been looking at classes and their methods. Now it's time to move on to the objects, such as the instances of class Song.

private jsp servlets Objects and Attributes The Song objects we've created so far have an internal state (such as the song title and artist). That state is private to those objects---no other object can access an object's instance variables. In general, this is a Good Thing. It means that the object is solely responsible for maintaining its own consistency. However, an object that is totally secretive is pretty useless---you can create it, but then you can't do anything with it.

private jsp servlets You'll normally define methods that let you access and manipulate the state of an object, allowing the outside world to interact with the object. These externally visible facets of an object are called its attributes. For our Song objects, the first thing we may need is the ability to find out the title and artist (so we can display them while the song is playing) and the duration (so we can display some kind of progress bar). class Song def name @name end def artist @artist end def duration @duration end end aSong = Song.new("Bicylops", "Fleck", 260) aSong.

private jsp servlets artist » "Fleck" aSong.name » "Bicylops" aSong.duration » 260 Here we've defined three accessor methods to return the values of the three instance attributes. Because this is such a common idiom, Ruby provides a convenient shortcut: attr_reader creates these accessor methods for you. class Song attr_reader :name, :artist, :duration end aSong = Song.

private jsp servlets

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private jsp servlets