Classifier - Software Development Case Studies in Java

Java Reference

In-Depth Information

The main concepts that define the domain of the application are:

item;

■

feature;

■

category.

■

These concepts and their relationships can be described using a UML

class diagram as shown in Figure 4.3.

Class Item represents the core concept of our application domain; it is

used to represent a car. The characteristics of an item are defined by means

of a set of Feature objects. The defined_by association represents the rela-

tionships between an item and the features that define it. In addition an Item

belongs to a Category .

The main concepts related to a classifier are described in the class

diagram in Figure 4.4. Class Node represents the nodes of a tree; they are

connected to each other through the parent - child association. Since the

links also have a label, class Arc further specifies this association type: it

adds a label.

The made_up_of association is an aggregation, this expresses the close

connection between the concept of a decision tree and its constituent nodes.

Among all the nodes that make up a decision tree, the root node is identified

by a dedicated association.

Item

Feature

defined_by

belongs_to