Ruby On Rails 面试题与答案

Question: What are the three levels of method access control for classes and what do they signify? What do they imply about the method?

• Public, protected, and private.

• Public methods can be called by all objects and subclasses of the class in which they are defined in.

• Protected methods are only accessible to objects within the same class.

• Private methods are only accessible within the same instance.

• Be able to explain why this does (or doesn�t matter), and when you would want to set a method as private.