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# U

UCS (universal character set)

Glossary

UDP (User Datagram Protocol)

Datagram Sockets
Glossary

unary minus (-) operator : Operators
unary plus (+) operator : Operators
Unicode character encoding

Text Encoding
Glossary

Uniform Resource Names (URNs)

Packages
Working with URLs

UnknownHostException

Clients
HeartBeat

UnknownServiceException : Stream Data
unnamed packages : The Unnamed Package
unreachable statements : Statements
update( )

Painting and Updating
Basic Drawing
using effectively : Drawing Techniques

updating

GUI components : Painting and Updating
image data : Image Producers and Consumers

URLConnection (class)

Web Browsers and Handlers
The URLConnection
URLs, Stream Handlers, and Connections
The URLConnection

URLContentHandler (class) : Web Browsers and Handlers
URLs (Uniform Resource Locators)

Network Programming
Working with URLs
base versus relative : Working with URLs
parsing : java.util.StringTokenizer
streams and : Stream Data
URL class : The URL class
of vendor : System Properties

URLStreamHandler (class) : Writing a Protocol Handler
URLStreamHandlerFactory (object) : Writing a Protocol Handler
URNs (Uniform Resource Names)

Packages
Working with URLs

User Datagram Protocol (UDP)

Datagram Sockets
Glossary

user-level security : Application and User Level Security
user.dir property

System Properties
File constructors

user.home : System Properties
user.name : System Properties
UTF-8 encoding

Data streams
Glossary

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