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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 Developing
- 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