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Abstract methods
From Axaptapedia
Abstract methods are used when you wish to force the developer of a sub-class to override the method and provide functionality.
Methods are declared as abstract by using the abstract keyword, for example
<xpp> public abstract void abstractMethod() { } </xpp> No code or declarations are allowed inside an abstract method.
It is not possible to declare a method as abstract unless the class is also declared as abstract. See abstract classes.
If a sub-class is created which does not override the abstract methods in its parent, then a compile error will occur where that sub-class is used.
