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low cost private jsp pages Although powerful, this technique can be dangerous, as the inheritance hierarchy can become ambiguous. Other languages, such as Java, support single inheritance. Here, a class can have only one immediate parent. Although cleaner (and easier to implement), single inheritance also has drawbacks---in the real world things often inherit attributes from multiple sources (a ball is both a bouncing thing and a spherical thing, for example). Ruby offers an interesting and powerful compromise, giving you the simplicity of single inheritance and the power of multiple inheritance.
low cost private jsp pages A Ruby class can have only one direct parent, and so Ruby is a single-inheritance language. 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.
low cost private jsp pages Now it's time to move on to the objects, such as the instances of class Song. 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.
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