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Daemon threads are non-user threads. They are typically used to carry out low-priority tasks that should not take priority over the main task of the program. They can be used to do useful work when all other user threads are blocked. The garbage collector is one example of a daemon thread.
- Browse Related Terms: Concurrency, curly brackets, daemon thread, garbage collector, interrupt, lightweight process, livelock, multithreaded, parallel programming, polling, preempt, priority level, process, quantum, race hazard, round robin allocation, synchronized, thread starvation, timeslice
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- The contents of an element in an XML stream, generally used when the element does not contain any subelements. When it does, the term content is generally used. When the only text in an XML structure is contained in simple elements and when elements that have subelements have little or no data mixed in, then that structure is often thought of as XML data, as opposed to an XML document.
- Browse Related Terms: CDATA, CSS, data, document, DTD, Element, HyperText Markup Language, JavaServer Pages (JSP), JSP directive, JSP page, JSP scriptlet, mixed-content model, Namespace, parser, PIXEL, raster, tag, XHTML, XML, XSLT
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There are eight primitive data types in Java; five of these represent numerical types of varying range and precision -
double,float,int,longandshort. The remaining three are used to representing single-bit values (boolean), single byte values (byte) and two-byte characters from the ISO Unicode character set (char).
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A packet of information passed between two communicating processes across a network. Both the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) are indirectly involved in sending datagrams to provide reliable or unreliable communication, respectively.
- 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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- Document-driven programming. The use of XML to define applications.
- Browse Related Terms: comment, content, DDP, Error, fatal error, JSP document, prolog, SAX, Schema, Simple API for XML, valid, validating parser, Warning, well-formed, XLink, XPath, XPointer
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Two rules that can help to simplify boolean expressions involving multiple logical-not operators in combination with other boolean operators.
- Browse Related Terms: arithmetic expression, arithmetic operator, assignment operator, binary operator, boolean expression, conditional operator, De Morgan's Theorem, expression, fully evaluating operator, implicit type conversion, JSP expression, logical operators, operand, operator, precedence rules, quotient, relational operators, short-circuit operator
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A situation that arises when two threads each acquires the lock to one of a set of resources that they both need.
- Browse Related Terms: caller, credentials, deadlock, naming context, privilege, Security attributes, security context, server principal
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Number representation in base 10. In base 10, the digits
0to9are used. Digit positions represent successive powers of 10.- Browse Related Terms: binary, decimal, hexadecimal, JAR, Modem, Modulation, octal, sound card
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A deck is a collection of one or more WML cards that can be downloaded, to a mobile phone, as a single entity.
- Browse Related Terms: 3GPP (3rd Generation Partnership Project), ARPANET, Deck, ETSI (European Telecommunications Standards Institute), GPRS (General Packet Radio System), GSM (Global System for Mobile Communications), icon, iDEN (Integrated Dispatch Enhanced Network), Internet, Mobitex, MSC (Mobile Switching Center), PSTN (public service telephone network), WAP Gateway, WML (Wireless Markup Language), WMLScript
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A statement that establishes an identifier and associates attributes with it, without necessarily reserving its storage (for data) or providing the implementation (for methods). See also definition.
- The very first thing in an XML document, which declares it as XML. The minimal declaration is
<?xml version="1.0"?>. The declaration is part of the document prolog. - Browse Related Terms: abstract class, abstract method, const, declaration, definition, final class, final method, goto, keyword, method signature, reserved word, static initializer, static method, static nested class
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A statement in which a variable is declared and immediately given its initial value. Three examples of declaration and initialization are
int numStudents = 23; Ship argo = new Ship(); Student[] students = new Student[numStudents];
Instance variables that are not explicitly initialized when they are declared have a default initial value that is appropriate to their type. Uninitialized local variables have an undefined initial value.- Browse Related Terms: blank final variable, declaration and initialization, default initial value, final, final variable, initialization parameter, initializer, uninitialized variable
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- Mechanisms used in an application that are expressed in a declarative syntax in a deployment descriptor.
- Browse Related Terms: application assembler, application client module, application component provider, declarative security, deployment descriptor, J2EE application, J2EE component, J2EE module, resource adapter module, role (development), role mapping, tool provider, Web module
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An operator (
--) that adds one to its operand. It has two forms: pre-decrement (--x) and post-decrement (x--). In its pre-decrement form, the result of the expression is the value of its argument after the decrement. In its post-decrement form, the result is the value of its argument before the decrement is performed. After the following,int a = 5, b = 5; int y,z; y = --a; z = b--
yhas the value4andzhas the value5. Bothaandbhave the value4.- 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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A copy of an object in which copies of all the object's sub-components are also made. The resulting object might, in effect, be a clone of the original. See shallow copy for an alternative.
- Browse Related Terms: array, base type, deep copy, dynamic type, finalization, garbage collection, heterogeneous collection, homogeneous collection, shallow copy, subarray
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A Java keyword optionally used after all
caseconditions in aswitchstatement. If allcaseconditions are not matched by the value of theswitchvariable, thedefaultkeyword will be executed.
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The default value of any variable not explicitly initialized when it is declared. Fields of numeric primitive types have the value zero by default,
booleanvariables have the valuefalse,charvariables have the value\u0000and object references have the valuenull. The initial values of local variables are undefined, unless explicitly 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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The destination for all values used in a switch statement expression that do not have explicit case labels. A default label is optional.
- Browse Related Terms: Break, break statement, CASE, case label, case sensitive, continue, Default, default label, else, if, JSP scripting element, switch, switch statement
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A declaration that reserves storage (for data) or provides implementation (for methods). See also declaration.
- Browse Related Terms: abstract class, abstract method, const, declaration, definition, final class, final method, goto, keyword, method signature, reserved word, static initializer, static method, static nested class
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The process by which an object passes on a message it has received to a sub-ordinate object. If inheritance is not available in a programming language, delegation is the most viable alternative for avoiding code duplication and promoting code reuse.
An act whereby one principal authorizes another principal to use its identity or privileges with some restrictions.
- An act whereby one principal authorizes another principal to use its identity or privileges with some restrictions.
- Browse Related Terms: Delegation, destination, durable subscription, HLR (Home Location Register), impersonation, publish/subscribe messaging system, topic, VLR (Visitor Location Register)
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- A person who installs J2EE modules and applications into an operational environment.
- Browse Related Terms: deployer, EAR file, EJB JAR file, enterprise bean provider, MIDlet, MIDlet suite, PRC (Palm Resource Code), programmatic security, RAR, WAR file