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A filename whose full path is unambiguously given starting from the top (root) of a file system tree. For instance
c:\Java\bin\javac.exe
See relative filename.- Browse Related Terms: absolute filename, asant, binding (XML), build file, Document Object Model, DOM, Extensible Markup Language, Java API for XML Processing (JAXP), kXML, processing instruction, RDF, relative filename, XLL, XML Schema
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A Java keyword used in a class definition to specify that a class is not to be instantiated, but rather inherited by other classes. An abstract class can have abstract methods that are not implemented in the abstract class, but in subclasses.
- 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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A class that contains one or more abstract methods, and therefore can never be instantiated. Abstract classes are defined so that other classes can extend them and make them concrete by implementing the abstract methods.
A class with the
abstractreserved word in its header. Abstract classes are distinguished by the fact that you may not directly construct objects from them using thenewoperator. An abstract class may have zero or more abstract methods.- 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
abstractreserved word in its header. An abstract method has no method body. Methods defined in an interface are always abstract. The body of an abstract method must be defined in a sub class of an abstract class, or the body of a class implementing an interface.A method that has no implementation.
- 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 part of an entity bean's deployment descriptor that defines the bean's persistent fields and relationships.
- Browse Related Terms: abstract schema, bean-managed persistence, cascade delete, container-managed persistence, conversational state, enterprise bean, Enterprise JavaBeans Query Language (EJB QL), entity bean, home interface, persistence, persistent field, primary key, reentrant entity bean, relationship field, stateful session bean, stateless session bean
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- A logical name that is referenced in EJB QL queries.
- 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 collection of graphical user interface (GUI) components that were implemented using native-platform versions of the components. These components provide that subset of functionality which is common to all native platforms. Largely supplanted by the Project Swing component set. See also Swing.
- Browse Related Terms: Abstract Window Toolkit (AWT), bootstrap classes, Java 2 Platform, Standard Edition (J2SE), Java Native Interface, JavaHQ, JDBC, JNDI, JNI, OS principal, POSE (Palm OS Emulator)
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A simplified representation of something that is potentially quite complex. It is often not necessary to know the exact details of how something works, is represented or is implemented, because we can still make use of it in its simplified form. Object-oriented design often involves finding the right level of abstraction at which to work when modeling real-life objects. If the level is too high, then not enough detail will be captured. If the level is too low, then a program could be more complex and difficult to create and understand than it needs to be.
- 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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The methods by which interactions with resources are limited to collections of users or programs for the purpose of enforcing integrity, confidentiality, or availability constraints.
- The methods by which interactions with resources are limited to collections of users or programs for the purpose of enforcing integrity, confidentiality, or availability constraints.
- Browse Related Terms: access control, authorization, authorization constraint, group, Realm, role (security), security constraint, security policy domain, security role, security technology domain, security view
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A method specifically designed to provide access to a
privateattribute of a class. By convention, we name accessors with agetprefix followed by the name of the attribute being accessed. For instance, the accessor for an attribute namedspeedwould begetSpeed. By making an attribute private, we prevent objects of other classes from altering its value other than through a mutator method. Accessors are used both to grant safe access to the value of a private attribute and to protect attributes from inspection by objects of other classes. The latter goal is achieved by choosing an appropriate visibility for the accessor.- 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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- The acronym for the four properties guaranteed by transactions: atomicity, consistency, isolation, and durability.
The acronym for the four properties guaranteed by transactions: atomicity, consistency, isolation, and durability.
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- The process of transferring an enterprise bean from secondary storage to memory. (See passivation.)
- 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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See client.
- 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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The value of an argument passed to a method from outside the method. When a method is called, the actual argument values are copied into the corresponding formal arguments. The types of the actual arguments must be compatible with those of the formal arguments.
- Browse Related Terms: actual argument, actual parameter, actual parameter list, anonymous array, anonymous object, argument, call-by-value, command-line argument, constructor, copy constructor, formal argument, formal parameter, formal parameter list, instanceof, method, method header, method overriding, parameter
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See actual argument.
- Browse Related Terms: actual argument, actual parameter, actual parameter list, anonymous array, anonymous object, argument, call-by-value, command-line argument, constructor, copy constructor, formal argument, formal parameter, formal parameter list, instanceof, method, method header, method overriding, parameter
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The arguments specified in a particular method call. See also formal parameter list.
- Browse Related Terms: actual argument, actual parameter, actual parameter list, anonymous array, anonymous object, argument, call-by-value, command-line argument, constructor, copy constructor, formal argument, formal parameter, formal parameter list, instanceof, method, method header, method overriding, parameter
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The area of virtual memory in which a process is run.
- Browse Related Terms: address space, archiving, compositing, deployment, distributed, double buffering, host system, interprocess communication, micro-chip, normalization, North American Industry Classification System (NAICS), object serialization, preverification, Random Access Memory, timesharing system, virtual memory
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See server.
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A relationship in which an object contains one or more other subordinate objects as part of its state. The subordinate objects typically have no independent existence separate from their containing object. When the containing object has no further useful existence, neither do the subordinate objects. For instance, a gas station object might contain several pump objects. These pumps will only exist as long as the station does. Aggregation is also referred to as the has-a relationship, to distinguish it from the is-a relationship, which refers to inheritance.
- 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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Multiple references to a single object. Messages may be sent to the object via any of its aliases. A resulting state change will be detectable by all.
- Browse Related Terms: aliases, functional programming, imperative programming, null reference, object reference, polymorphism, reference, static type, variable declaration