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A class hierarchy has numerous advantages over a discriminated union Chief among these is that the class hierarchy provides type safety In the example, every Shape instance is either a valid Circle or a valid Rectangle It is a simple matter to generate a shape_t structure that is complete garbage, as the association between the tag and the union is not enforced by the language If the tag indicates that the shape_t represents a rectangle but the union has been set for a circle, all bets are off Even if a discriminated union has been initialized properly, it is possible to pass it to a function that is inappropriate for its tag value A second advantage of the class hierarchy is that code is simple and clear The discriminated union is cluttered with boilerplate: declaring the enum type, declaring the tag field, switching on the tag field, dealing with unexpected tag values, and the like The discriminated union code is made even less readable by the fact that the operations for the various types are intermingled rather than segregated by type A third advantage of the class hierarchy is that it is easily extensible, even by multiple parties working independently To extend a class hierarchy, simply add a new subclass If you forget to override one of the abstract methods in the superclass, the compiler will tell you in no uncertain terms To extend a discriminated union, you need access to the source code You must add a new value to the enum type, as well as a new case to the switch statement in each operation on the discriminated union Finally, you must recompile If you forget to provide a new case for some method, you won't find out until run time, and then only if you're careful to check for unrecognized tag values and generate an appropriate error message A fourth advantage of the class hierarchy is that it can be made to reflect natural hierarchical relationships among types, to allow for increased flexibility and better compile-time type checking Suppose the discriminated union in the original example also allowed for squares The class hierarchy could be made to reflect the fact a square is a special kind of rectangle (assuming both are immutable):.

readerreset(); categoriesadd( new PropertyCategory(this, reader)); } } catch (IOException e) { FavoritesLoglogError(e); } }

to emphasize the notion that p has a particular type (ie, int*) These two usages are equivalent because spaces around the * are neutral However, the latter usage conceals a pitfall that is so important that it deserves special

public PropertyElement[] getChildren() { List<PropertyElement> children = new ArrayList<PropertyElement>(); childrenaddAll(unnamedCategorygetEntries()); childrenaddAll(categories); return childrentoArray(new PropertyElement[childrensize()]); } public void addCategory(PropertyCategory category) { if (!categoriescontains(category)) { categoriesadd(category); categoryAdded(category); } } public void removeCategory(PropertyCategory category) { if (categoriesremove(category)) categoryRemoved(category); } public void removeFromParent() { // Nothing to do } void addPropertyFileListener( PropertyFileListener listener) { if (!listenerscontains(listener)) listenersadd(listener); } void removePropertyFileListener( PropertyFileListener listener) { listenersremove(listener); } void keyChanged(PropertyCategory category,PropertyEntry entry) { Iterator<PropertyFileListener> iter = listenersiterator(); while (iterhasNext()) iternext()keyChanged(category, entry); }

attention:

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void valueChanged(PropertyCategory category, PropertyEntry entry) { Iterator<PropertyFileListener> iter = listenersiterator(); while (iterhasNext()) iternext()valueChanged(category, entry); } void nameChanged(PropertyCategory category) { Iterator<PropertyFileListener> iter = listenersiterator(); while (iterhasNext()) iternext()nameChanged(category); } void entryAdded(PropertyCategory category,PropertyEntry entry) { Iterator<PropertyFileListener> iter = listenersiterator(); while (iterhasNext()) iternext()entryAdded(category, entry); } void entryRemoved(PropertyCategory category, PropertyEntry entry) { Iterator<PropertyFileListener> iter = listenersiterator(); while (iterhasNext()) iternext()entryRemoved(category, entry); } void categoryAdded(PropertyCategory category) { Iterator<PropertyFileListener> iter = listenersiterator(); while (iterhasNext()) iternext()categoryAdded(category); } void categoryRemoved(PropertyCategory category) { Iterator<PropertyFileListener> iter = listenersiterator(); while (iterhasNext()) iternext()categoryRemoved(category); } }

The PropertyFileListener interface is used by the ProperyFile to notify registered listeners, such as PropertiesEditor, that changes have occurred in the model

defines p as an object of type "pointer to int" and q as an object of type int This example is easier to understand if we view it this way:

Effective Java: Programming Language Guide class Square extends Rectangle { Square(double side) { super(side, side); } double side() { return length; // or equivalently, width }

package comqualityeclipsefavoriteseditors; public interface PropertyFileListener { void keyChanged( PropertyCategory category, PropertyEntry entry); void valueChanged( PropertyCategory category, PropertyEntry entry);

void nameChanged( PropertyCategory category); void entryAdded( PropertyCategory category, PropertyEntry entry); void entryRemoved( PropertyCategory category, PropertyEntry entry); void categoryAdded( PropertyCategory category); void categoryRemoved( PropertyCategory category); }

or, for that matter, this way:

Key features of the free edition include: Live bidirectional code and model synchronization Native Graphical Editor Framework (GEF) integration Native Eclipse Modeling Framework (EMF) integration An Enterprise version (available for $1,990) adds the following features: Complete Java Version 2 Enterprise Edition (J2EE) lifecycle Complete database modeling lifecycle Open API and UML profiles are being merged and will offer a unique opportunity to fully customize your applications

We now know enough to write a simple program that uses pointers:

MyEclipse Enterprise Workbench (available for $29 for the standard edition or $49 for the professional edition via yearly subscription) is a completely integrated product extension for Eclipse and offers a full-featured J2EE IDE based on the Eclipse platform MyEclipse supports the full development lifecycle (code, deploy, test, and debug) for JavaServer Pages (JSP), Enterprise JavaBeans (EJB), XML, JSF, AJAX, and Struts

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