Questions tagged as 'polimorfismo'

Tagged questions
2
answers

It is possible to cast objects of abstract classes

hi how I have a question that is killing me I hope you can help me what I know according to what I understand:    You can not instantiate objects of an abstract class my doubt: The Graphics2D class inherits from Graphics both are ab...
asked by 16.05.2018 / 09:39
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Use polymorphism in objects of classes that implement the same interface?

Is it possible? Or they must necessarily inherit from the same parent class ... public interface interfaz { } public class a : interfaz { } public class b : interfaz { } public class prueba { public void X() { a objetoA =...
asked by 08.02.2018 / 19:12
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Doubt about Polymorphism and fixes in C ++

I have a question about the use of arrays with polymorphism, the subject is like this: I have a class Article that inherit two classes Book and CD. class Articulo { protected: string nom; public: Articulo(); virtual voi...
asked by 31.10.2017 / 22:56
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Polymorphism and Inheritance in Java

They commissioned me a job in which I must use the polymorphism and inheritance of POO, the problem is that of 4 "values" that I want to show only shows me 2, I would like to know if someone could give me an alternative for this, not It is somet...
asked by 14.02.2018 / 21:56
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how to use JList and Un ArrayList java

I am trying to create a list of vehicles I made 4 classes the father class and the daughters that are aerial and maritime land. what I do is something like that public static ArrayList<Transportation> transportations = new ArrayList&l...
asked by 27.10.2018 / 03:55
1
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Error voting response in model with polymorphism

I have the following model that allows you to vote for questions and for answers with the model Vote defined as a polymorphic model. The question vote part works well for me but I do not know how to approach the voting for the answers....
asked by 27.10.2017 / 02:47
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Rails, What is the best way to show the images in the view before uploading it to the bd, with carrierwave?

I have been creating a view in the form, which has images, but I can not find the way to show the previous images that I am selecting to leave or remove them before uploading them to the bd, either to create or to edit. I enclose my form and I a...
asked by 08.12.2018 / 22:38
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expected type-specifier before error c ++

I get an error compiling that I do not understand, I'm implementing the Langton ant using inheritance and polymorphism, by creating a pointer to a class that defines a type of ant with special characteristics. Estos son los errores que me sale...
asked by 11.03.2018 / 21:33
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Problems with polymorphism in java

This problem arose from the question next I have the following polymorphism code in java and the problem I have is that children classes are not executed Parent Class "Player" public class reproductor implements Runnable { pro...
asked by 02.02.2018 / 18:49