how to generate barcode in vb.net 2008 Understanding Polymorphism in Java

Generator Code 3 of 9 in Java Understanding Polymorphism

Understanding Polymorphism
ANSI/AIM Code 39 Scanner In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
Code 39 Printer In Java
Using Barcode drawer for Java Control to generate, create Code-39 image in Java applications.
testPhone(smartPhone); System.out.println("\nAbout to test a smart phone " + "as a smart phone..."); testSmartPhone(smartPhone); } private void testPhone(Phone phone) { phone.callNumber(5559869447); phone.isRinging(); } private void testSmartPhone(SmartPhone phone) { phone.sendEmail("Hi","edward@scjaexam.com"); phone.retrieveEmail(); } }
Read USS Code 39 In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
Bar Code Printer In Java
Using Barcode creation for Java Control to generate, create barcode image in Java applications.
The main() method kicks off the program by creating a Tester object and therefore calling Tester() the constructor. The constructor is used to call each test method. In between each method call, it prints a line to standard out that indicates what the programming is doing. The testPhone() method is used to test each method of the Phone class. It accepts a Phone object as an argument. The final method is the testSmartPhone() method. This method tests each method of the SmartPhone class. The Tester() constructor starts by creating two local variables. The first is called landLinePhone and is a Phone object. The second is called smartPhone and is a SmartPhone object. The constructor then displays a message and calls the testPhone() method with the landLinePhone variable as an argument. Next, the constructor displays another message and again calls the testPhone() method. The smartPhone variable is used as the argument. The testPhone() method requires a Phone object as its argument, but the example has used a SmartPhone object instead. This is polymorphism. A smart phone is a more specific type of phone. A smart phone can do everything a landline phone can and more. This is represented in the SmartPhone class by it extending Phone. It is important to notice that the testPhone() method is expecting a Phone object as an argument. It is perfectly acceptable if it gets a more specific type of phone. However, any additional method of the more specific class cannot be utilized. Since this method is designed for a Phone object as an argument, it can only use methods declared in the Phone class.
Scan Barcode In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Code 39 Extended Encoder In C#
Using Barcode maker for .NET Control to generate, create Code 3 of 9 image in .NET applications.
Practical Examples of Polymorphism
Code 3 Of 9 Drawer In .NET Framework
Using Barcode maker for ASP.NET Control to generate, create Code 39 Extended image in ASP.NET applications.
Encoding Code 39 In VS .NET
Using Barcode encoder for VS .NET Control to generate, create Code 3/9 image in VS .NET applications.
Finally the constructor displays another status message and calls the testSmartPhone() method. This method exercises the methods declared in the SmartPhone object. Since polymorphism is unidirectional, the testSmartPhone() method cannot be called with a Phone object as its argument. The following is the output that would be generated by this program:
USS Code 39 Maker In Visual Basic .NET
Using Barcode creator for .NET framework Control to generate, create Code-39 image in .NET applications.
2D Barcode Maker In Java
Using Barcode maker for Java Control to generate, create Matrix 2D Barcode image in Java applications.
About to test a land line phone as a phone... Phone: Calling number 5559869447 Phone: Checking if phone is ringing About to test a smart phone as a phone... Phone: Calling number 5559869447 SmartPhone: Checking if phone is ringing About to test a smart phone as a smart phone... SmartPhone: Sending Email SmartPhone: Retrieving Email
GS1 128 Encoder In Java
Using Barcode printer for Java Control to generate, create UCC.EAN - 128 image in Java applications.
Data Matrix 2d Barcode Drawer In Java
Using Barcode printer for Java Control to generate, create ECC200 image in Java applications.
When the landLinePhone variable is used with the testPhone() method, the output is simply generated from the Phone class since it is a Phone object. When the smartPhone variable is used with the testPhone() method, the flow of execution is more complex. Since the SmartPhone class extends the Phone class, the SmartPhone class inherits both the callNumber() and isRinging() methods. However, the SmartPhone class overrides the isRinging() method with its own. When the callNumber() method is invoked on a SmartPhone object, the method in the Phone class is used since it is not overridden. However, when the isRinging() method is called, the method in the SmartPhone class is used. This follows the basic rule of inheritance and overriding methods.
Encoding USPS OneCode Solution Barcode In Java
Using Barcode printer for Java Control to generate, create USPS OneCode Solution Barcode image in Java applications.
Painting Barcode In Objective-C
Using Barcode creator for iPhone Control to generate, create barcode image in iPhone applications.
Examples of Polymorphism via Implementing Interfaces
Bar Code Decoder In Visual C#
Using Barcode Control SDK for VS .NET Control to generate, create, read, scan barcode image in .NET applications.
Generate GTIN - 13 In None
Using Barcode generator for Microsoft Excel Control to generate, create EAN / UCC - 13 image in Excel applications.
This example will focus on an object s ability to behave polymorphically as an interface that its class implements. This allows objects that may be radically different, but share some common functionality, to be treated similarly. The common functionality is defined in an interface that each class must implement. This example is composed of three classes and one interface. There is a Tester class to test the program. The other two classes are objects representing a goat and a box. Both in this program and conceptually, the objects are very different. A goat is a living animal and a box is an inanimate object. However, they both share a common ability. Both the Goat class and the Box class can describe themselves. This functionality
Code 3/9 Maker In None
Using Barcode creator for Online Control to generate, create Code 39 Extended image in Online applications.
Generating ECC200 In Objective-C
Using Barcode printer for iPhone Control to generate, create DataMatrix image in iPhone applications.
8:
Bar Code Generator In C#.NET
Using Barcode creation for VS .NET Control to generate, create bar code image in .NET applications.
Decoding Bar Code In Visual C#.NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET applications.
Copyright © OnBarcode.com . All rights reserved.