DEV475 Mastering Object-Oriented Analysis and Design with UML ...

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DEV475 Mastering Object-Oriented Analysis and Design with UMLWhat Is Polymorphism?What Is Polymorphism?• The ability to hide many differentimplementations behind a single interfaceManufacturer AManufacturer BManufacturer COO Principle:EncapsulationMastering Object Oriented Analysis and Design with UMLCopyright © 2003 Rational Software, all rights reserved 28The Greek term polymorphos means “having many forms.” There may be one ormany implementations of a given interface. Every implementation of an interfacemust fulfill the requirements of that interface. In some cases, the implementation canperform more than the basic interface requirements.For example, the same remote can be used to control any type of television(implementation) that supports the specific interface that the remote was designed tobe used with.2 - 28
Module 2 - Concepts of Object OrientationExample: PolymorphismExample: PolymorphismfinancialInstrument.getCurrentValue()getCurrentValue()getCurrentValue()getCurrentValue()Stock Bond Mutual FundMastering Object Oriented Analysis and Design with UMLCopyright © 2003 Rational Software, all rights reserved 29In this example, a requesting object would like to know the current value of afinancial instrument. However, the current value for each financial instrument iscalculated in a different fashion. The stock needs to determine the current askingprice in the financial market that it is listed under. The bond needs to determine thetime to maturity and interest rates. A mutual fund needs to look up the closing pricefor the day from the fund management company.In a non object-oriented development environment, we would write code that maylook something like this:IF financialInstrument = Stock THENcalcStockValue()IF financialInstrument = Bond THENcalcBondValue()IF financialInstrument = MutualFund THENcalcMutualFundValue()With object technology, each financial instrument can be represented by a class, andeach class will know how to calculate its own value. The requesting object simplyneeds to ask the specific object (for example, Stock) to get its current value. Therequesting object does not need to keep track of three different operation signatures.It only needs to know one. Polymorphism allows the same message to be handled indifferent ways, depending on the object that receives it.2 - 29
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