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Published on 2010-04-03T09:43:33Z
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2010/04/03
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Here is the msdn article on abstract class but i really dont get it... When should i really use abstract classes? What are the advantages of using abstract classes?
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I’ve run into the problem a few times now: How to pre-authenticate .NET WebRequest calls doing an HTTP call to the server – essentially send authentication credentials on the very first request instead of waiting for a server challenge first? At first glance this sound like it should be easy:…
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Man I can't believe this. I'm still mucking around with OFX servers and it drives me absolutely crazy how some these servers are just so unbelievably misconfigured. I've recently hit three different 3 major brokerages which fail HTTP validation with bad or corrupt certificates at least according to…
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The dynamic type in C# 4.0 is a welcome addition to the language. One thing I’ve been doing a lot with it is to remove explicit Reflection code that’s often necessary when you ‘dynamically’ need to walk and object hierarchy. In the past I’ve had a number of ReflectionUtils that used string based expressions…
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I’ve written quite a bit about Visual FoxPro interoperating with .NET in the past both for ASP.NET interacting with Visual FoxPro COM objects as well as Visual FoxPro calling into .NET code via COM Interop. COM Interop with Visual FoxPro has a number of problems but one of them at least got a lot…
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Here’s a nice and simple path utility that I’ve needed in a number of applications: I need to find a relative path based on a base path. So if I’m working in a folder called c:\temp\templates\ and I want to find a relative path for c:\temp\templates\subdir\test.txt I want to receive back subdir\test…
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I am working on a simple abstract database class. In my usage of this class, I'll want to have some instance be a singleton. I was thinking of having a abstract class that is not a singleton, and then extend it into another abstract class that is a singleton. Is this possible? Recommended?
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Is it OK to derive an abstract class from a non-abstract class or is there something wrong with this approach?
Here´s a little example:
public class Task {
// Some Members
}
public abstract class PeriodicalTask : Task {
// Represents a base class for task that has to be done periodicaly.
…
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So I have code set up like this:
public interface IInterface {
public void setField(Object field);
}
public abstract class AbstractClass extends JPanel implements IInterface {
private Object field_;
public void setField(Object field) {
field_ = field;
}
}
public class…
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Hi,
I'm new to Java and I have a beginner question:
NumberFormat is an abstract class and so I assume I can't make an instance of it. But there is a public static (factory?) method getInstance() that allow me to do
NumberFormat nf = NumberFormat.getInstance();
I'm quite confuse. I'll be glad…
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Hi,
I'm new to Java and I have a beginner question:
NumberFormat is an abstract class and so I assume I can't make an instance of it. But there is a public static (factory?) method getInstance() that allow me to do
NumberFormat nf = NumberFormat.getInstance();
I'm quite confuse. I'll be glad…
>>> More
