Question about interfaces

I hsve a setp where some classes inherit from a base (events, more common math) class. All derived classes implement the same set of methods.

Another part of the program wants to instantiate one of these classes.

So far I was creating empty functions in the base class and by substituting the. An interface may improve on it?

I tried to list the common functions in an interface and use it as a data type, but that wouldn't let me use the functions that already inherits from the base class, to the specific event dispatcher. I add to the interface?

Looks like your current configuration is essentially an abstract class. It's a perfectly legitimate technique of OO, do not feel bad about it. Looks like you might want an implementation in your base class, such as basic math; It's something you can't be in an interface, as they cannot guarantee that a function exists, they may not contain all the features - you will need to re-implement what anyone who implements the interface anyway. In addition, if you want to ensure certain other legacies (as of the event dispatcher, which is a class not a flash interface), it is a job best suited for an abstract class.

The interfaces are how you would multiple inheritance. For this reason, using a reference of type of interface would be a) that worry about the existence of functions and fields, regardless of the implementation and b) don't have access to what suits him and not be encumbered with other features beyond what is defined in the interface. Depending on the scope and complexity of your project, these may or may not be important things.

If you want to use an interface when even (since the creation of empty functions and substituting them typically would be this way) you can create features in your interface that "expose" something that is supposed to exist in the class, but can be reflected in the interface (like your example of event dispatcher). You can create your own "dispatchEvent" in the interface, which calls the real dispatchEvent in its implementation. It's probably a bad idea, though, as he could get out to fast enough hand you need to do this a lot. Only do that if you really need multiple inheritance, or maybe if you're hacking something together.

Long story short, you can stick with what you have and use the base class as you would for the interface

Tags: Adobe Animate

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