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A pattern of class definition that is used as a generator of instances of other classes. Often used to create platform- or locale-specific implementations of abstract classes or interfaces. This reduces coupling between classes as it frees the factory's client from a need to know about particular implementations.
- Browse Related Terms: Abstraction, accessor method, coupling, divide and conquer, factory pattern, floating point number, inconsistent state, information hiding, locale, mutator method, object-oriented design, pattern, singleton pattern, state, wrapper
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- A fatal error occurs in the SAX parser when a document is not well formed or otherwise cannot be processed. See also error, warning.
- 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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Frequency-division multiple-access (FDMA) is a mechanism for sharing a radio frequency band among multiple users by dividing it into a number of smaller bands.
- 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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The simple set of steps that are endlessly repeated by a computer's Central Processing Unit for each program instruction: `Fetch the next instruction referenced by the program counter,' `Update the program counter to refer to the next instruction,' `Execute the instruction just fetched.'
- Browse Related Terms: assembler, assembly language, branch instruction, Central Processing Unit, fetch-execute cycle, instruction set, low level programming languages, portable, program counter, Template
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Variables defined inside a class or interface, outside of the methods. Fields are members of a class.
A data member of a class. Unless specified otherwise, a field is not static.
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The (FIFO) semantics of a queue data structure. Items are removed in the order in which they arrived in the queue, so older items are always removed before newer ones. See last in, first out.
- Browse Related Terms: binary search, FIFO (first in, first out), Image Map, infinite recursion, LIFO (last in, first out), Stack, stack overflow
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An operating system makes it possible to use space on a computer's disk drives by imposing a structured file system on the disk storage. Each file system has its own conventions for the way in which files are named, folders and directories are structured, and large files are split into smaller pieces, for instance. It is not usually possible to transfer data directly from the file system of one operating system to that of a different operating system, because their conventions are likely to be incompatible.
- Browse Related Terms: cHTML (Compact HTML), disk drive, File System, multiprogramming system, operating system, Software Engineering, swapping, Thin Client, UTF
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The File Transfer Protocol (FTP) defines a standard set of rules that make it possible to transfer a file from one file system to another.
- Browse Related Terms: File Transfer Protocol, FTP, HTTP, HTTP (HyperText Transfer Protocol), HTTPS, HTTPS (Hyper Text Transfer Protocol Secure sockets), IIOP, Java Secure Socket Extension (JSSE), ORB, scheme, Secure Socket Layer (SSL), SOAP (Simple Object Access Protocol), well-known port
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- An object that can transform the header or content (or both) of a request or response. Filters differ from Web components in that they usually do not themselves create responses but rather modify or adapt the requests for a resource, and modify or adapt responses from a resource. A filter should not have any dependencies on a Web resource for which it is acting as a filter so that it can be composable with more than one type of Web resource.
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- A concatenation of XSLT transformations in which the output of one transformation becomes the input of the next.
- Browse Related Terms: append mode, codebase, executable content, filter chain, JAR (Java ARchive) file, manifest file, swizzling, Xalan, XSLTC, zip file
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An input-output class that filters or manipulates its stream of input- or output-data in some way. Two examples are
DataInputStreamandDataOutputStream.- Browse Related Terms: filter stream, hash code, Reader class, stream class, Writer class
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A Java keyword. You define an entity once and cannot change it or derive from it later. More specifically: a final class cannot be subclassed, a final method cannot be overridden and a final variable cannot change from its initialized 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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A class with the
finalreserved word in its header. A final class may not be extended by another class.- 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 method with the
finalreserved word in its header. A final method may not be overridden by a method defined in a sub class.- 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 variable with the
finalreserved word in its declaration. A final may not assigned to once it has been initialized. Initialization often takes place as part of its declaration. However, the initialization of an uninitialized final field (known as a blank final variable) may be deferred to the class's constructor, or an initializer.- Browse Related Terms: blank final variable, declaration and initialization, default initial value, final, final variable, initialization parameter, initializer, uninitialized variable
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Immediately before an object is garbage collected, its
finalizemethod is called. This gives it the opportunity to free any resources it might be holding on to.- 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 that executes a block of statements regardless of whether a Java Exception, or run time error, occurred in a block defined previously by the
trykeyword.- Browse Related Terms: boundary error, Catch, finally, runtime error, semantic error, SQL/J, syntax error
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Part of a try statement that is always executed, either following the handling a caught exception, or normal termination of the protected statements.
- 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 method defined in the home interface and invoked by a client to locate an entity bean.
- Browse Related Terms: abstract schema name, activation, actor, bean-managed transaction, business logic, business method, caller principal, create method, EJB, EJB context, EJB home object, EJB module, EJB object, finder method, handle, message-driven bean, method permission, Passivation, remote interface, remove method, transaction attribute
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A Java keyword used to define a floating point number variable.
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