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Exam Objective 3.4 Develop code that uses polymorphism for both classes and interfaces, and recognize code that uses the "program to an interface" principle. This section will continue examining polymorphism. While the first section in this chapter approached the topic from a theoretical viewpoint, this section will look at coding examples. These examples are important to understand, and if reviewed carefully, they should provide a clear understanding of the concepts presented in the earlier section.
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This section will provide examples of polymorphism. The first example will demonstrate how polymorphism can be applied when a class extends another. There is no difference between the use of concrete or abstract classes. The next example demonstrates the use of polymorphism when interfaces are used. These examples will help reinforce the concepts covered in this chapter. The SCJA exam will require
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knowledge of how to use polymorphism. Understanding these examples will better prepare you for the polymorphism questions on the test.
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The following example is intended to demonstrate the use of polymorphism with class inheritance. This example has three classes. Two classes are used to represent phones. The Phone class is intended to be a simple representation of a standard phone. This class has a method to dial a number, and return the state of whether the phone is ringing or not. The second class represents a smart phone, and is appropriately named SmartPhone. The SmartPhone class extends the Phone class. This class adds the additional functionality of being able to send and receive e-mails. The final class is named Tester and is used as a driver to test both phone classes and demonstrate polymorphism in action. The phone classes are simple representations, and most of their functionality is not implemented. Instead, it is noted as comments regarding its intended purposes. The following is the Phone class:
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public class Phone { public void callNumber(long number) { System.out.println("Phone: Calling number " + number); /* Logic to dial number and maintain connection. */ } public boolean isRinging() { System.out.println("Phone: Checking if phone is ringing"); boolean ringing = false; /* Check if the phone is ringing and set the ringing variable */ return ringing; } }
The Phone class is a simple class used for a normal phone with basic features. The class has a callNumber() method that is used to call the number that is passed as an argument. The isRinging() method is used to determine if the phone is currently ringing. This class prints to standard out its class name and what action it is performing as it enters each method. The Phone class is the base class for the SmartPhone class. The SmartPhone class is listed next.
public class SmartPhone extends Phone { public void sendEmail(String message, String address) { System.out.println("SmartPhone: Sending Email");
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/* logic to send email message */ } public String retrieveEmail() { System.out.println("SmartPhone: Retrieving Email"); String messages = new String(); /* Return a String containing all of the messages*/ return messages; } public boolean isRinging() { System.out.println("SmartPhone: Checking if phone is ringing"); boolean ringing = false; /* Check for email activity and only continue when their is none. */ /* Check if the phone is ringing and set the ringing variable */ return ringing; } }
The SmartPhone class represents a smart phone. This class extends the Phone class and therefore inherits its functionality. The SmartPhone class has a sendEmail() method that is used to send an e-mail message. It has a retrieveEmail() method that will return as a String any messages that have not been retrieved yet. This class also has an isRinging() method that overrides the isRinging() method from the superclass Phone. Similar to the Phone class, the SmartPhone class prints to standard out the class name and function it will perform each time it enters a method. The final class is named Tester. The class has the main() method for the demonstration program. This class exercises all of the methods in the Phone and SmartPhone classes.
public class Tester { public static void main(String[] args) { new Tester(); } public Tester() { Phone landLinePhone = new Phone(); SmartPhone smartPhone = new SmartPhone(); System.out.println("About to test a land line phone " + "as a phone..."); testPhone(landLinePhone); System.out.println("\nAbout to test a smart phone " + "as a phone...");
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