auto generate barcode vb net Understanding Polymorphism in Java

Painting Code 3/9 in Java Understanding Polymorphism

Understanding Polymorphism
Recognizing Code 39 Extended In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
Code 39 Maker In Java
Using Barcode encoder for Java Control to generate, create Code 39 Extended image in Java applications.
TwO-mINuTE DRIll
USS Code 39 Recognizer In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
Draw Barcode In Java
Using Barcode drawer for Java Control to generate, create barcode image in Java applications.
Polymorphism
Barcode Recognizer In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Code-39 Maker In Visual C#.NET
Using Barcode drawer for VS .NET Control to generate, create Code 3 of 9 image in .NET applications.
q Polymorphism is a fundamental concept of object-oriented languages,
Making USS Code 39 In VS .NET
Using Barcode generation for ASP.NET Control to generate, create Code 3/9 image in ASP.NET applications.
Code39 Encoder In .NET Framework
Using Barcode generation for .NET Control to generate, create Code-39 image in Visual Studio .NET applications.
including Java.
Create ANSI/AIM Code 39 In VB.NET
Using Barcode maker for .NET framework Control to generate, create Code-39 image in .NET applications.
Encoding Code 128 Code Set A In Java
Using Barcode maker for Java Control to generate, create Code 128 Code Set A image in Java applications.
q Polymorphism stimulates code reuse. q Polymorphism allows one object to act as either one of its superclasses, or as
Drawing UPCA In Java
Using Barcode generator for Java Control to generate, create UCC - 12 image in Java applications.
Generating GS1 - 12 In Java
Using Barcode maker for Java Control to generate, create UPC-A Supplement 5 image in Java applications.
an interface that it implements.
Interleaved 2 Of 5 Generation In Java
Using Barcode printer for Java Control to generate, create Uniform Symbology Specification ITF image in Java applications.
Make UPC Symbol In Objective-C
Using Barcode generation for iPad Control to generate, create UPC-A image in iPad applications.
q A subclass (more specific) is-a superclass (more general) object. q Polymorphism is unidirectional. More specific objects can only polymorphically
Data Matrix ECC200 Generation In Objective-C
Using Barcode creator for iPad Control to generate, create ECC200 image in iPad applications.
Drawing Code 128 Code Set A In Visual C#.NET
Using Barcode generator for .NET framework Control to generate, create Code 128 Code Set C image in Visual Studio .NET applications.
act as more general objects.
Barcode Reader In Java
Using Barcode Control SDK for BIRT reports Control to generate, create, read, scan barcode image in BIRT reports applications.
UCC-128 Creation In None
Using Barcode generator for Online Control to generate, create GS1 128 image in Online applications.
q By implementing an interface, an object is declaring it has the functionality
GS1 128 Generator In Java
Using Barcode generator for Android Control to generate, create EAN 128 image in Android applications.
Data Matrix ECC200 Decoder In .NET Framework
Using Barcode reader for VS .NET Control to read, scan read, scan image in VS .NET applications.
defined in the interface. This allows that object to polymorphically act as the interface.
q Programming to an interface is the concept where the developer defines the
required functionality instead of defining strict object data types. This allows other developers to interact with the code using any object they choose as long as it implements the required interfaces.
Practical Examples of Polymorphism
q An object can be used interchangeably with any of its superclasses without
the need to be cast.
q An object can be used interchangeably with any interface that it implements
without the need to be cast.
q When a more specific object is polymorphically used as a general object, the
more specific functionality is not available.
q Polymorphism is commonly used for method arguments.
Self Test
SElF TEST
Polymorphism
1. Which statement is true about the term polymorphism A. It is a Latin word that roughly means changeable. B. It is a Greek word that roughly means many forms. C. It is an Old English word that roughly means insectlike. D. It is a new technical term that means Java object. 2. What type of object can polymorphically behave as another A. An object can act as any subclass of the class it was created from. B. An object can act as any superclass of the class it was created from. C. An object can act as any other abstract class. 3. Polymorphism helps to facilitate which of the following (Choose all that apply.) A. Highly optimized code B. Code reuse C. Code obfuscation D. Code that is generic and flexible 4. What is a correct is-a relationship A. A specific object is-a more generic one. B. A generic object is-a more specific one. C. A null object is-an object. 5. Which of the following statements explain why an object can polymorphically behave as an interface A. By implementing the interface, the object is required to have all of the functionality that the interface represents. An object can behave as an interface because interfaces do not have a strict expected behavior and therefore any object can act as an interface.
B. y implementing the interface, the object inherits all the required methods it defines. B C.
8:
Understanding Polymorphism
6. What does it mean if a developer is programming to an interface A. They are implementing an interface for the class they are working on B. They were given a set of interfaces they must implement. C. They are defining the functionality instead of strict object types as much as possible.
Practical Examples of Polymorphism
The following code example will be referenced in questions 7 through 12. Afterward, see Figure 8-3. The Drivable interface:
public interface Drivable { /* * Drivable definitions */ }
The Tractor class:
public class Tractor implements Drivable{ /* * Tractor functionality */ }
The Vehicle class:
public class Vehicle { /* * Vehicle functionality */ }
The Car class:
public class Car extends Vehicle implements Drivable{ /* * Car functionality */ }
The Truck class:
public class Truck extends Vehicle implements Drivable{ /* * Truck functionality */ }
Self Test
FIguRE 8-3
Vehicle
<<interface>> Drivable
UML for questions 7 12
Truck
Tractor
7. Given the preceding classes and interface, would the following code segment produce errors when compiled
Car car = new Car(); Vehicle vehicle = car;
A. No errors would be produced. B. This code would result in compile errors. 8. Given the preceding classes and interface, would the following code segment produce errors when compiled
Truck truck = new Truck(); Drivable drivable = truck;
A. No errors would be produced. B. This code would result in compile errors. 9. Given the preceding classes and interface, would the following code segment produce errors when compiled
Tractor tractor = new Tractor(); Vehicle vehicle = tractor;
A. No errors would be produced. B. This code would result in compile errors. 10. Given the preceding classes and interface, would the following code segment produce errors when compiled
Drivable drivable = new Drivable(); Truck truck = drivable;
8:
Understanding Polymorphism
A. No errors would be produced. B. This code would result in compile errors. 11. Given the preceding classes and interface, would the following code segment produce errors when compiled
Vehicle vehicle = new Vehicle(); Object o = vehicle;
A. No errors would be produced. B. This code would result in compile errors. 12. Given the preceding classes and interface, would the following code segment produce errors when compiled
Truck truck = new Truck(); Object o = truck;
Copyright © OnBarcode.com . All rights reserved.