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At the beginning of this narrative I mentioned a class OO frequently has a hierarchy of classes A class can belong to a parent class, and in turn, a class can contain subclasses But parent classes and subclasses are not just ways of arranging or storing classes Rather, the relationship of classes is functional The attributes of a parent class are passed downward through inheritance Earlier I stated that when a class is instantiated, it becomes an object Depending on the data that is passed on to the object, it may behave in different ways This characteristic is known as polymorphism For example, a class that computes shipping charges will behave in different ways, depending upon the source and destination addresses, as well as on special circumstances such as customers In this case, polymorphism is not just about the rate that is chosen for shipping, but possibly other objects will be called, such as objects to handle customs, taxes, or hazardous materials declarations OO programming and operational environments will have one or more class libraries These take many forms, depending upon the operating system, languages, and subsystems that are in use For instance, in the Java language, class libraries are stored in JAR (Java ARchive) files that are located on the system where programs can refer to them when needed
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Component-based development is an approach that reflects the software architecture of an application Here, an application environment will be made up of several independent components, often located on different physical systems, which work together For example, a large application environment might consist of a group of centrally located servers that process primary transactions These servers contain interfaces, using standard interface technologies such as CORBA (Common Object Request Broker Architecture), DCOM (Distributed Component Object Model), or SOA (Service-Oriented Architecture), that other parts of the overall application environment may communicate with For instance, auxiliary components such as batch input and output, data warehouses, static table updates (such as tax or shipping rates), and client programs may all be independent applications that communicate with the core system NOTE In a component-based environment, some components may be systems that are owned and operated by other organizations This is especially true of web-based mashups, where applications may include components from external applications
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The creation of the HTML content-display standard and the HTTP communications protocol has revolutionized application development The web browser is ubiquitous and has become the universal client platform that is not unlike an intelligent terminal from earlier eras The Web, as it is popularized now, came along just in time: two-tier and three-tier client-server computing, the great new application development paradigm that was developed in the 1990s, was not living up to its promise, particularly in the areas of
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performance and upkeep of client software Web software has greatly simplified software development from the perspective of the user interface (UI); while the developer has a little less control over what and how data will be displayed on a user workstation, the trade-off in not having to maintain client-side software is seen as acceptable From a development methodology perspective, web application development can be performed within virtually all of the development frameworks including waterfall, agile, RAD, DOSD, and OO (all discussed in this chapter) Primarily it s the technology that differentiates web-based application development from its alternatives Two important standards have been developed that facilitate communications between web-based applications; they are SOAP and WSDL SOAP, or simple object access protocol, is an XML-based API specification that facilitates real-time communications between applications using the HTTP and HTTPS protocols Functionally, SOAP operates similarly to RPC (remote procedure call), wherein one application transmits a query to another application, and the other application responds with a query result SOAP messages are based in the XML (eXtensible Markup Language) standard WSDL, or web services description language, is another service that serves as specification repository for the SOAP services available in a particular environment This permits an application to discover what services are available on an application server
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