Dealing with Generalization

Managing inheritance hierarchies.

Table of Contents

• Pull Up Field: Move a field to the superclass.
• Pull Up Method: Move a method to the superclass.
• Push Down Field: Move a field to a subclass.
• Push Down Method: Move a method to a subclass.
• Extract Interface: Extract common methods to an interface.
• Collapse Hierarchy: Merge a subclass and superclass.
• Form Template Method: Implement the skeletal algorithm in a method in the superclass.
• Replace Inheritance with Delegation: Place the object in a field and delegate operations to it.
• Replace Delegation with Inheritance: Make the delegating class inherit from the delegate.