[[TableOfContents]]
= Chapter 11 Dealing With Generalization =
== Pull Up Field ==
 * Two subclasses have the same field.[[BR]]''Move the field to the superclass.''
http://zeropage.org/~reset/zb/data/PullUpField.gif
== Pull Up Method ==
 * You have methods with identical results on subclasses.[[BR]]''Move them to the superclass''
http://zeropage.org/~reset/zb/data/PullUpMethod.gif
== Pull Up Constructor Body ==
 * You have constructors on subclasses with mostly identical bodies.[[BR]]''Create a superclass constructor; class this from the subclass methods.''
{{{~cpp 
class Manager extends Employee...
	public Manager (String name, String id, int grade) {
		_name = name;
		_id = id;
		_grade = grade;
	}
}}}

{{{~cpp 
public Manager (String name, String id, int grade) {
	super (name, id);
	_grade = grade;
}
}}}

== Push Down Method ==
 * Behavior on a superclass is relevant only for some of its subclasses.[[BR]]''Move it to those subclasses.''
http://zeropage.org/~reset/zb/data/PushDownMethod.gif
== Push Down Field ==
 * A field is used only by some subclasses.[[BR]]''Move the field to those subclasses.''
http://zeropage.org/~reset/zb/data/PushDownField.gif
== Extract Subclass ==
 * A class has features that are used only in some instances.[[BR]]''Create a subclass for that subset of features.''
http://zeropage.org/~reset/zb/data/ExtractSubclass.gif
== Extract Superclass ==
 * You have two classes with similar features.[[BR]]''Create a superclass and move the common features to the superclass.''
http://zeropage.org/~reset/zb/data/ExtractSuperClass.gif
== Extract Interface ==
 * Several clients use the same subset of a class's interface, or two classes have part of their interfaces in common.[[BR]]''Extract the subset into an interface.''
http://zeropage.org/~reset/zb/data/ExtractInterface.gif
== Collapse Hierarchy ==
 * A superclass and subclass are not very different.[[BR]]''Merge them together.''
http://zeropage.org/~reset/zb/data/CollapseHierarchy.gif
== Form Template Method ==
 * You have two methods in subclasses that perform similar steps in the same order, yet the steps are different.[[BR]]''Get the steps into methods with the same signature, so that the original methods become the same. Then you call pull them up.''
http://zeropage.org/~reset/zb/data/FormTemplateMethod.gif
== Replace Inheritance with Delegation ==
 * A subclass uses only part of a superclasses interface or does not want to inherit data.[[BR]]''Create a field for the superclass, adjust methods to delegate to the superclass, and remove the subclassing.''
http://zeropage.org/~reset/zb/data/ReplaceInheritanceWithDelegation.gif
== Replace Delegation with Inheritance ==
 * You're using delegation and are ofter writing many simple delegations for the entire interface.[[BR]]''Make the delegating class a subclass of the delegate.''
http://zeropage.org/~reset/zb/data/ReplaceDelegationWithInheritance.gif
----
["Refactoring"]