Java Util Package - Utility Package of Java
Java Utility package is one of the most commonly used packages in the java
program. The Utility Package of Java consist of the following components:
- collections framework
- legacy collection classes
- event model
- date and time facilities
- internationalization
- miscellaneous utility classes such as string tokenizer, random-number
generator and bit array
Here are some of the description of the utility classes of this package:
Data Structure Classes
Data Structure Classes are very useful classes for implementing standard computer science data
structures: including BitSet, Dictionary, Hashtable, Stack and Vector. The Enumeration interface
of java.util package is used to count through a set of values.
Date
The Date class is used to manipulate calendar dates in a
system-independent fashion.
StringTokenizer
This StringTokenizer class is used to convert a String of text into its tokens.
Properties
The properties table contains
key/value pairs where both the key and the value are Strings and the class is
used by the System class to implement System properties.
Observer and Observable
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.
Random-Number Generator
The Random Number Generator class is used to generate the random-numbers.
Enumeration
The Enumeration interface defines a generic programming interface for
iterating through a set of values.
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