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Universal Description, Discovery, and Integration (UDDI) is an XML-based standard for describing, publishing, and finding Web services. UDDI is a specification for a distributed registry of Web services.
- Browse Related Terms: B2B, ebXML, Java API for XML Registries (JAXR), OASIS, registry provider, UDDI (Universal Description Discovery and Integration), XML registry
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The User Datagram Protocol (UDP) is a set of rules that allow communication between two processes across a network. The protocol is unreliable, which means that information is not guaranteed to be transferred correctly between the two processes. See Transmission Control Protocol (TCP) for an alternative reliable protocol.
- Browse Related Terms: datagram, IP, operator precedence, port, TCP (Transmission Control Protocol), TCP endpoint, TCP/IP, UDP (User Datagram Protocol), WTP (Wireless Transaction Protocol)
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Developed by Nortel Networks, Universal Mobile Telecommunications Service (UMTS) is a standard that will provide cellular users a consistent set of technologies no matter where they are located worldwide. UMTS utilizes W-CDMA technology.
- Browse Related Terms: 3G (Third generation), 802.11, AMPS (Advanced Mobile Phone Service), CDMA (Code-Division Multiple Access), CDMA One, CDMA2000, CDPD (Cellular Digital Packet Data), EDGE (Enhanced Data GSM Environment), FDMA (Frequency-division multiple-access), i-mode, JavaSpaces, LAN (Local area network), OTA (Over The Air), PCS (Personal Communications Service), PDC (Personal Digital Cellular), TDMA (Time-division multiple access), UMTS (Universal Mobile Telecommunications Service), W-CDMA (Wideband Code-Division Multiple Access), WAE (Wireless Application Environment), WDP (Wireless Datagram Protocol)
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An operator taking a single operand. Java's unary operators are
-,+,!,!,++and--.- Browse Related Terms: assignment statement, decrement operator, increment operator, post-decrement operator, post-increment operator, pre-decrement operator, pre-increment operator, ternary operator, unary operator
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Repetition where the statements within a loop's body are performed an arbitrary number of times, according to the effects of the statements within the loop's body. All of the loop control structures in Java provide for unbounded repetition. See bounded repetition.
- Browse Related Terms: bounded repetition, Condition, continue statement, control structure, do, do loop, FOR, for loop, hot spot, if statement, if-else statement, infinite loop, iteration, loop variable, repetition, statement, Toggle, unbounded repetition, while, while loop
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An exception for which it is not required to provide a local try statement, or to propagate via a throws clause defined in the method header. An exception that is not handled will cause program termination if it is thrown. See checked exception.
- Browse Related Terms: bounds, catch clause, catching exceptions, checked exception, exception, exception handler, finally clause, propagation, protected statement, throw an exception, throw statement, try, try statement, unchecked exception
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A 16-bit character set defined by ISO 10646. See also ASCII. All source code in the Java programming environment is written in Unicode.
- A standard defined by the Unicode Consortium that uses a 16-bit code page that maps digits to characters in languages around the world. Because 16 bits covers 32,768 codes, Unicode is large enough to include all the world's languages, with the exception of ideographic languages that have a different character for every concept, such as Chinese. For more information, see
http://www.unicode.org/. A 16-bit character set designed to make it easier to exchange and display information that makes use of a wide range of different languages and symbols.
- Browse Related Terms: bytecode, classpath, compilation, compilation unit, compiler, edit-compile-run cycle, interpreter, Java Virtual Machine (JVM), JavaSafe, Just-in-time (JIT) Compiler, lexical, linker, Obfuscation, punctuation, runtime system, single line comment, Unicode
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A local variable that been declared, but has had no value assigned to it. The compiler will warn of variables which are used before being initialized.
- Browse Related Terms: blank final variable, declaration and initialization, default initial value, final, final variable, initialization parameter, initializer, uninitialized variable
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- An industry initiative to create a platform-independent, open framework for describing services, discovering businesses, and integrating business services using the Internet, as well as a registry. It is being developed by a vendor consortium.
- Browse Related Terms: IDE (Integrated Development Environment), Java, Java 2 SDK, Standard Edition, Java APIs for Integrated Networks (JAIN), Java Card API, Java Development Kit (JDK), Java Platform, Java Runtime Environment (JRE), JCP (Java Community Process), JDK, JRE, SDK (Software Development Kit), stack trace, Universal Description, Discovery and Integration (UDDI) project
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- A schema that classifies and identifies commodities. It is used in sell-side and buy-side catalogs and as a standardized account code in analyzing expenditure.
- Browse Related Terms: HTML, ISO 3166, key value, MIME, Parsing, RDF schema, SGML, SQL, Universal Standard Products and Services Classification (UNSPSC), XSL
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All classes defined in files without a package declaration are placed in the unnamed package.
- Browse Related Terms: import, import statement, KJava, package, package access, package declaration, reflection, root, stream, top level class, unnamed package
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- A general entity that contains something other than XML. By its nature, an unparsed entity contains binary data.
- Browse Related Terms: binary entity, Entity, entity reference, external entity, external subset, general entity, local subset, notation, parameter entity, parsed entity, unparsed entity
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A cast towards an object's ultimate super type - that is, `up' the inheritance hierarchy towards the Object class, for instance
// Upcast from VariableController to HeaterController VariableController v; ... HeaterController c = v;
See downcast. Java's rules of polymorphism mean that an explicit upcast is not usually required.- Browse Related Terms: abstract, aggregation, class inheritance, has-a relationship, Hash Function, hierarchy, implements clause, inheritance, inheritance hierarchy, interface inheritance, is-a relationship, multiple inheritance, sibling sub classes, single inheritance, sub class, Super, upcast
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Uniform Resource Identifier. A compact string of characters for identifying an abstract or physical resource. A URI is either a URL or a URN. URLs and URNs are concrete entities that actually exist; A URI is an abstract superclass.
- Uniform resource identifier. A globally unique identifier for an abstract or physical resource. A URL is a kind of URI that specifies the retrieval protocol (
httporhttpsfor Web applications) and physical location of a resource (host name and host-relative path). A URN is another type of URI. - Browse Related Terms: bookmark, protocol, Resource, URI, URL, URL (Uniform Resource Locator), URN, Web resource, Web resource collection
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Uniform Resource Locator. A standard for writing a text reference to an arbitrary piece of data in the WWW. A URL looks like "protocol://host/localinfo" where protocol specifies a protocol to use to fetch the object (like HTTP or FTP), host specifies the Internet name of the host on which to find it, and localinfo is a string (often a file name) passed to the protocol handler on the remote host.
- Uniform resource locator. A standard for writing a textual reference to an arbitrary piece of data in the World Wide Web. A URL looks like this:
protocol://host/localinfowhereprotocolspecifies a protocol for fetching the object (such ashttporftp),hostspecifies the Internet name of the targeted host, andlocalinfois a string (often a file name) passed to the protocol handler on the remote host. - Browse Related Terms: bookmark, protocol, Resource, URI, URL, URL (Uniform Resource Locator), URN, Web resource, Web resource collection
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The part of a URL passed by an HTTP request to invoke a servlet. A URL path consists of the context path + servlet path + path info, where
- Browse Related Terms: context attribute, Filter, query string, servlet container, servlet context, servlet mapping, Session, URL path, Web component
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A Uniform Resource Locator (URL) extends the concept of file access from a purely local context to one in which resources are named uniformly, irrespective of where they might be physically located. A URL encodes a location (e.g.
www.javasoft.com) a name (e.g.index.html) and a scheme (e.g.http).- Browse Related Terms: bookmark, protocol, Resource, URI, URL, URL (Uniform Resource Locator), URN, Web resource, Web resource collection
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Uniform Resource Name. A unique identifier that identifies an entity, but doesn't tell where it is located. A system can use a URN to look up an entity locally before trying to find it on the Web. It also allows the Web location to change, while still allowing the entity to be found.
- Uniform resource name. A unique identifier that identifies an entity but doesn't tell where it is located. A system can use a URN to look up an entity locally before trying to find it on the Web. It also allows the Web location to change, while still allowing the entity to be found.
- Browse Related Terms: bookmark, protocol, Resource, URI, URL, URL (Uniform Resource Locator), URN, Web resource, Web resource collection
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- Indicates how data between a client and a Web container should be protected. The protection can be the prevention of tampering with the data or prevention of eavesdropping on the data.
- Browse Related Terms: anonymous access, Basic authentication, certificate authority, client-certificate authentication, digest authentication, form-based authentication, keystore, mutual authentication, principal, public-key certificate, server certificate, SIM (Subscriber Identity Module), SSL, SSL (Secure Sockets Layer), user (security), user data constraint, WTLS (Wireless Transport Layer Security)
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An individual (or application program) identity that has been authenticated. A user can have a set of roles associated with that identity, which entitles the user to access all resources protected by those roles.
- Browse Related Terms: anonymous access, Basic authentication, certificate authority, client-certificate authentication, digest authentication, form-based authentication, keystore, mutual authentication, principal, public-key certificate, server certificate, SIM (Subscriber Identity Module), SSL, SSL (Secure Sockets Layer), user (security), user data constraint, WTLS (Wireless Transport Layer Security)