The Java Utility Package
The final Java package, java.util, contains a collection
of utility classes.
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Data Structure Classes
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A variety of useful classes implementing standard computer
science data structures: including
BitSet, Dictionary, Hashtable, Stack and Vector.
The java.util package also defines the Enumeration interface
which provides a protocol for classes to count through a set of values.
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Date
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Use the Date class to create and manipulate calendar
dates in a system-independent fashion.
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StringTokenizer
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This class converts a String of text into its tokens.
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Properties
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This class implements persistent properties. The properties
table contains key/value pairs where both the key and the value
are Strings. This class is used by the System class to
implement System properties.
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Observer and Observable
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Classes that implement the Observer interface can "watch"
Observable objects for state changes. When an Observable
object changes it notifies all of its Observers of the
change.
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Random-Number Generator
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The Random class implements a random-number generator.
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Enumeration
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The Enumeration interface defines a generic programming
interface for iterating through a set of values.
See Also
java.util
