Examples

class Abstract
{
	private var sub:IAbstract;
	// Private constructor disallows instantiation
	private function Abstract()
	{
		// Cast a reference of the extending class instance to the interface type
		// which contains the abstract methods.
		sub = IAbstract(this);
		//Flash Player 7 Only
		if(sub == null) // invalid cast will return null in Flash player 7
		{
			throw("Classes extending Abstract must implement IAbstract");
		}
		// end Flash Player 7 Only
		/* For Flash Player 6 (or 7) use this runtime type check
		if(!(sub instanceof IAbstract))
		{
		sub = null;
		trace("Classes extending Abstract must implement IAbstract");
	}
		*/
		//Because sub is of type IAbstract no compiler error is thrown
		sub.myAbstractMethod();
	}
}

This category contains 2 examples, and has been viewed 58414 times.

• XML Properties - An example that works with an XML file (17195 views)
• Abstract Class - An example of an abstract class in Actionscript (13819 views)