Java Reference
In-Depth Information
The Category POJO has a number of protected instance variables, each with correspond-
ing setters and getters that conform to JavaBeans naming conventions. Other than name
and modificationDate , all the other properties have a specific role in domain mod-
eling and persistence. The id property is used to store a unique number to identify the
category. The items property holds all the items stored under a category and represents a
many-to-many relationship between items and categories. The parentCategory prop-
erty represents a self-referential many-to-one relationship between parent and child cat-
egories. The subCategories property maintains a one-to-many relationship between a
category and its subcategories.
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