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Hi I have a doubt regarding HttpServlet class is an abstract class even though there is not any abstract method in the class , all methods are concrete. Can class be abstract even if does not have any abstract methods? If yes Whats the use?
Thanks
Answer Snippets (Read the full thread at stackoverflow):
If the class is abstract, you can't create an instance of that classOne cannot instantiate abstract classes so you have to subclass them in order to use sense to have an unspecialised instance of that....
It's a matter of intent.
work.
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Public abstract class A { public abstract void Process(); } public abstract class B : A { public abstract override void Process(); } public class C : B { public override void Process() { Console.WriteLine("abc"); } }
This code throws an Compilation Error...
Started by Alon on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
This code is equivalent:
public abstract class A { public abstract void Process(); } public ....
B inherits it anyway from A, and since B itself is abstract, you do not explicitly to have the 'override' in B.
Completely in class B.
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Please help :/
In Java you can create an abstract class that contains only abstract methods. On the other hand, you can create an interface that declares the same methods. So can you use abstract classes instead of interfaces?
Cheers!
Started by Registered User on
, 9 posts
by 9 people.
Answer Snippets (Read the full thread at stackoverflow):
With an interfaceIn some cases you....
That implementations (for instance those made by the user) extending the abstract class still work implementation, existing implementations of the abstract class will continue to work fine.
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In past couple of days, I have read about quite a lot about dependency injection/inversion of control/inversion of dependency. I think that, now my understanding of the concept is much better. But I still don't get the following from wikipedia:
A. High...
Started by Sandbox on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Abstraction....
Abstractions move that position closer closer to your work.
Think of the work you need to invoke, and how far away of work you need to do to invoke that functionality.
To implement the same abstraction.
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I am creating an abstract class. I want each of my derived classes to be forced to implement a specific signature of constructor. As such, I did what I would have done has I wanted to force them to implement a method, I made an abstract one.
public abstract...
Started by Anthony D on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
If the classes ....
You to an object of a derived class, define an abstract method which needs to be implemented by derived classes.
What exactly do you need this for? We might be able to suggest a work around for this.
Be abstract.
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An abstract base class (interface class) usually has all its member functions abstract. However, I have several cases where member functions consisting of calls to the abstract methods of the interface are used. I can implement them in a derived-but-still...
Started by andreas buykx on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
It okay for....
Now I would implementation.
If you really want an interface, it is probably best to use your second of the template method pattern - it's a concrete implementation based on calling abstract methods.
In an abstract base class.
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I've written a JavaScript application that runs off Prototype & Scriptaculous. I'm thinking of rolling it out in as an open source product & would like it to be able to run on jQuery as well — I typically use jQuery for most of my other apps, except the...
Started by zemaj on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
I don't think it's insane, but you might have some fun trying to work out which personally have to guess that it would not work....
The key difference find, go use it".
Ext.JS on top of any of the underlying libraries and it will just work.
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An abstract base class (ABC) can have data to support the classes that inherit form it. However, given that its not possible to instantiate an object of an ABC how does the compiler handle this data for cases where we have a number of derived class objects...
Started by Wawel100 on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
This is because
public void RunInstantiate() { IAbstract abc; abc = new Implement(); }
abc will always point to a real object (of the type Implement... .
A compiler can only accept an inherited type that has been instantiated with derived, substantial class .
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I'm in a situation where I'm required to make at least some effort to remove never-used code from my source code. The general preference is to use a static code analysis tool. We've had great luck with this in other projects, but the folks I hear from...
Started by bethlakshmi on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
For dead methods in particular, meaning a method which cannot be called at runtime, the false... .
This particular task of finding dead code can be hit-or-miss for a static analyzer .
I previously worked at Coverity, on the Java static analysis product.
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I am trying to create a web-based tool for my company that, in essence, uses geographic input to produce tabular results. Currently, three different business areas use my tool and receive three different kinds of output. Luckily, all of the outputs are...
Started by DonaldRay on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
Have each report implement a FindDetails method (I'd have them inherit from a Report abstract class)....
Don't the type system work for me).
The simplest thing that could possibly work now with a view to refectoring when you need it.
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