Chapter 19. Utility Classes
The package java.util contains many classes that do not logically belong elsewhere. Several of these classes are very important, such as Date, Vector, EventObject, GregorianCalendar, and Properties. Most of these classes have been around since JDK 1.0, or at least JDK 1.1. This chapter focuses primarily on what is new in Java 2: the Collection Framework. There is also coverage of two classes that are quite important in Java programs: GregorianCalendar and Properties. While EventObject is an important class, you generally encounter it only through a subclass, such as java.awt.event.ActionEvent.
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