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476 Object-Oriented Programming Chapter 9 regardless of the object’s type, so the new Mercurian objects just “fit right in.” Thus, with polymorphism, new types of objects not even envisioned when a system is created can be added without modifications to the system (other than the new class itself, of course). Through the use of polymorphism, one method call can cause different actions to occur, depending on the type of the object receiving the call. This gives the programmer tremendous expressive capability. We will see examples of the power of polymorphism in the next several sections. Software Engineering Observation 9.19 With polymorphism, the programmer can deal in generalities and let the execution-time environment concern itself with the specifics. The programmer can command a wide variety of objects to behave in manners appropriate to those objects without even knowing the types of those objects. 9.19 Software Engineering Observation 9.20 Polymorphism promotes extensibility: Software written to invoke polymorphic behavior is written independent of the types of the objects to which messages (i.e., method calls) are sent. Thus, new types of objects that can respond to existing messages can be added into such a system without modifying the base system. 9.20 Software Engineering Observation 9.21 If a method is declared final, it cannot be overridden in subclasses, so method calls may not be sent polymorphically to objects of those subclasses. The method call may still be sent to subclasses, but they will all respond identically rather than polymorphically. 9.21 Software Engineering Observation 9.22 An abstract class defines a common interface for the various members of a class hierarchy. The abstract class contains methods that will be defined in the subclasses. All classes in the hierarchy can use this same interface through polymorphism. 9.22 Although we cannot instantiate objects of abstract superclasses, we can declare references to abstract superclasses. Such references can be used to enable polymorphic manipulations of subclass objects when such objects are instantiated from concrete classes. Let us consider more applications of polymorphism. A screen manager needs to display a variety of objects, including new types of objects that will be added to the system even after the screen manager is written. The system may need to display various shapes (the superclass is Shape), such as Circle, Triangle and Rectangle. Each shape class is derived from superclass Shape. The screen manager uses superclass Shape references to manage the objects to be displayed. To draw any object (regardless of the level at which that object appears in the inheritance hierarchy), the screen manager uses a superclass reference to the object and simply sends a draw message to the object. Method draw has been declared abstract in superclass Shape and has been overridden in each of the subclasses. Each Shape object knows how to draw itself. The screen manager does not have to worry about what type each object is or whether the screen manager has seen objects of that type before—the screen manager simply tells each object to draw itself. Polymorphism is particularly effective for implementing layered software systems. In operating systems, for example, each type of physical device could operate quite differently from the others. Even so, commands to read or write data from and to devices can have a © Copyright 1992–2002 by Deitel & Associates, Inc. All Rights Reserved. 7/7/01
Chapter 9 Object-Oriented Programming 477 certain uniformity. The write message sent to a device-driver object needs to be interpreted specifically in the context of that device driver and how that device driver manipulates devices of a specific type. However, the write call itself is really no different from the write to any other device in the system—simply place some number of bytes from memory onto that device. An object-oriented operating system might use an abstract superclass to provide an interface appropriate for all device drivers. Then, through inheritance from that abstract superclass, subclasses are formed that all operate similarly. The capabilities (i.e., the public interface) offered by the device drivers are provided as abstract methods in the abstract superclass. The implementations of these abstract methods are provided in the subclasses that correspond to the specific types of device drivers. It is common in object-oriented programming to define an iterator class that can walk through all the objects in a collection (such as an array). If you want to print a list of objects in a linked list, for example, an iterator object can be instantiated that will return the next element of the linked list each time the iterator is called. Iterators are commonly used in polymorphic programming to walk through an array or a linked list of objects from various levels of a hierarchy. The references in such a list would all be superclass references (see Chapter 19, Data Structures, for more on linked lists). A list of objects of superclass class TwoDimensionalShape could contain objects from the classes Square, Circle, Triangle and so on. Sending a draw message to each object in the list would, using polymorphism, draw the correct picture on the screen. 9.16 Case Study: A Payroll System Using Polymorphism Let us use abstract classes, abstract methods and polymorphism to perform payroll calculations based on the type of employee (Fig. 9.16). We use an abstract superclass Employee. The subclasses of Employee are Boss (Fig. 9.17)—paid a fixed weekly salary regardless of the number of hours worked, CommissionWorker (Fig. 9.18)—paid a flat base salary plus a percentage of sales, PieceWorker (Fig. 9.19)—paid by the number of items produced and HourlyWorker (Fig. 9.20)—paid by the hour and receives overtime pay. Each subclass of Employee has been declared final, because we do not intend to inherit from them again. An earnings method call certainly applies generically to all employees. But the way each person’s earnings are calculated depends on the class of the employee, and these classes are all derived from the superclass Employee. So earnings is declared abstract in superclass Employee and appropriate implementations of earnings are provided for each of the subclasses. Then, to calculate any employee’s earnings, the program simply uses a superclass reference to that employee’s object and invokes the earnings method. In a real payroll system, the various Employee objects might be referenced by individual elements in an array of Employee references. The program would simply walk through the array one element at a time, using the Employee references to invoke the earnings method of each object. Software Engineering Observation 9.23 If a subclass is derived from a superclass with an abstract method, and if no definition is supplied in the subclass for that abstract method (i.e., if that method is not overridden in the subclass), that method remains abstract in the subclass. Consequently, the subclass is also an abstract class and must be explicitly declared as an abstract class. 9.23 © Copyright 1992–2002 by Deitel & Associates, Inc. All Rights Reserved. 7/7/01
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Contents Preface xxxv 1 Introductio
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Contents IX 5 Control Structures: P
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Contents XI 9.15 Polymorphism Examp
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Contents XIII 13.15 GridBagLayout L
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Contents XV 20 Java Utilities Packa
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Contents XVII H.6 Class ElevatorSha
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Live in fragments no longer. Only c
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Appendix Preface XXXVII a carefully
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Appendix Preface XXXIX Some Notes t
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Appendix Preface XLI sist on three-
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Appendix Preface XLIII 46 Testing a
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Appendix Preface XLV also were able
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Appendix Preface XLVII tions; Entit
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Appendix Preface XLIX extraordinary
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Appendix Preface LI Boston Universi
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Objectives 1 Introduction to Comput
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Chapter 1 Introduction to Computers
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Objectives 21 Collections • To un
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Appendix A Java Demos 1347 www.java
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Appendix B Java Resources 1349 deve
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C Operator Precedence Chart Operato
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D ASCII Character Set 0 1 2 3 4 5 6
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Appendix E Number Systems (on CD) 1
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Objectives F Creating HTML Document
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Appendix F Creating HTML Documentat
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Appendix G Elevator Events and List
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H Elevator Model (on CD) H.1 Introd
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Objectives J Career Opportunities (
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Appendix J Career Opportunities (on
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Objectives K Unicode® (on CD) •
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