Java definitions beginning with M

magic number - permalink - collapse

All > Technology > Programming > Java

A constant value with a significance within a particular context. For instance, the value 12 could mean many different things - the number of hours you have worked today, the number of dollars you are owed by a friend, and so on. As far as possible, such values should be associated with an identifier that clearly expresses their meaning.
```
 final int maxSpeed = 50; 
```
If stored in a final variable, it is unlikely that any execution overhead will be incurred by doing so.
David J. Barnes - Cite This Source - This Definition
Browse Related Terms: Boolean, CAST, implicit type conversion, out-of-bounds value, redundant value, Toggle, value-binding expression

Also listed in

All > Technology > Telecommunications > Mobile > Android

marking interface - permalink - collapse

All > Technology > Programming > Java

An interface with no methods.
David J. Barnes - Cite This Source - This Definition
Browse Related Terms: behavior, class header, implements, Interface, throw, type, wrapper

member - permalink - collapse

All > Technology > Programming > Java

A field or method of a class. Unless specified otherwise, a member is not static.
Sun Microsystems - Cite This Source - This Definition
The members of a class are fields, methods and nested classes.
David J. Barnes - Cite This Source - This Definition
Browse Related Terms: class body, fully qualified class name, inner class, interpretational inner class, local inner class, nested class, non-static nested class, static nested class, subordinate inner class, top level class

Also listed in

All > Business > Banking
All > Business > Finance > Personal Finance > Retirement

memory leak - permalink - collapse

All > Technology > Programming > Java

A situation in which memory that is no longer being used has not been returned to the pool of free memory. A garbage collector is designed to return unreferenced objects to the free memory pool in order to avoid memory leaks.
David J. Barnes - Cite This Source - This Definition
Browse Related Terms: aliases, finalization, garbage collection, garbage collector, object reference

message - permalink - collapse

All > Technology > Programming > Java

In the Java Message Service, an asynchronous request, report, or event that is created, sent, and consumed by an enterprise application and not by a human. It contains vital information needed to coordinate enterprise applications, in the form of precisely formatted data that describes specific business actions.

Sun Microsystems - Cite This Source - This Definition
Browse Related Terms: filter, HTTP, servlet, servlet container, servlet container, distributed, Session, Web component, Web container, distributed, Web Service

Also listed in

All > Technology > Telecommunications

message consumer - permalink - collapse

All > Technology > Programming > Java

An object created by a JMS session that is used for receiving messages sent to a destination.

Sun Microsystems - Cite This Source - This Definition
Browse Related Terms: Java Message Service (JMS), JavaMail, JMS, JMS application, JMS client, JMS provider, JMS session, message producer, one-way messaging, request-response messaging, SMS (Short Message Service), SOAP with Attachments API for Java (SAAJ), WMA (Wireless Messaging API)

message-driven bean - permalink - collapse

All > Technology > Programming > Java

An enterprise bean that is an asynchronous message consumer. A message-driven bean has no state for a specific client, but its instance variables can contain state across the handling of client messages, including an open database connection and an object reference to an EJB object. A client accesses a message-driven bean by sending messages to the destination for which the bean is a message listener.

Sun Microsystems - Cite This Source - This Definition
Browse Related Terms: bean, enterprise bean, JavaBeans, managed bean creation facility, reentrant entity bean, stateful session bean, stateless session bean

message passing - permalink - collapse

All > Technology > Programming > Java

We characterize object interactions as message passing. A client object sends a message to a server object by invoking a method from the server's class. Arguments may be passed with the message, and a result returned by the server.
David J. Barnes - Cite This Source - This Definition
Browse Related Terms: actual argument, argument, command-line argument, formal argument, instanceof, method header, method signature

message producer - permalink - collapse

All > Technology > Programming > Java

An object created by a JMS session that is used for sending messages to a destination.

Sun Microsystems - Cite This Source - This Definition
Browse Related Terms: Java Message Service (JMS), JavaMail, JMS, JMS application, JMS client, JMS provider, JMS session, message consumer, one-way messaging, request-response messaging, SMS (Short Message Service), SOAP with Attachments API for Java (SAAJ), WMA (Wireless Messaging API)

method - permalink - collapse

All > Technology > Programming > Java

A function defined in a class. See also instance method, class method. Unless specified otherwise, a method is not static.
Sun Microsystems - Cite This Source - This Definition
The part of a class definition that implements some of the behavior of objects of the class. The body of the method contains declarations of local variables and statements to implement the behavior. A method receives input via its arguments, if any, and may return a result if it has not been declared as void.
David J. Barnes - Cite This Source - This Definition
Browse Related Terms: class, classpath, encapsulation, functional programming, global variable, imperative programming, lexicographic ordering, locale

Also listed in

All > Law > Intellectual Property > Patent
All > Technology > Programming > Perl

method-binding expression - permalink - collapse

All > Technology > Programming > Java

A JavaServer Faces EL expression that refers to a method of a backing bean. This method performs either event handling, validation, or navigation processing for the UI component whose tag uses the method-binding expression.

Sun Microsystems - Cite This Source - This Definition
Browse Related Terms: application configuration resource file, backing bean, binding (JavaServer Faces technology), component (JavaServer Faces technology), JavaServer Faces conversion model, JavaServer Faces event and listener model, JavaServer Faces expression language, JavaServer Faces navigation model, JavaServer Faces UI component, JavaServer Faces UI component class, JavaServer Faces validation model, life cycle (JavaServer Faces), render kit, renderer, Web Application

method body - permalink - collapse

All > Technology > Programming > Java

The body of a method: everything inside the outermost block of a method.
David J. Barnes - Cite This Source - This Definition
Browse Related Terms: Block, class scope, Identifier, local variable, method variable, out of scope, overloading, scope, variable

method header - permalink - collapse

All > Technology > Programming > Java

The header of a method, consisting of the method name, its result type, formal arguments and any exceptions thrown. Also known as a method signature.
David J. Barnes - Cite This Source - This Definition
Browse Related Terms: actual argument, argument, command-line argument, formal argument, instanceof, message passing, method signature

method overloading - permalink - collapse

All > Technology > Programming > Java

Two or more methods with the same name defined within a class are said to be overloaded. This applies to both constructors and other methods. Overloading applies through a class hierarchy, so a sub class might overload a method defined in one of its super classes. It is important to distinguish between an overloaded method and an overridden method. Overloaded methods must be distinguishable in some way from each other; either by having different numbers of arguments, or by the types of those arguments being different. Overridden methods have identical formal arguments.
David J. Barnes - Cite This Source - This Definition
Browse Related Terms: Hash Function, method overriding, overriding, overriding for breadth, overriding for chaining, overriding for restriction

method overriding - permalink - collapse

All > Technology > Programming > Java

A method defined in a super class may be overridden by a method of the same name defined in a sub class. The two methods must have the same name and number and types of formal arguments. Any checked exception thrown by the sub class version must match the type of one thrown by the super class version, or be a sub class of such an exception. However, the sub class version does not have to throw any exceptions that are thrown by the super class version. It is important to distinguish between method overriding and method overloading. Overloaded methods have the same names, but differ in their formal arguments. See overriding for breadth, overriding for chaining and overriding for restriction.
David J. Barnes - Cite This Source - This Definition
Browse Related Terms: Hash Function, method overloading, overriding, overriding for breadth, overriding for chaining, overriding for restriction