Re: Declaring Java classes and methods

[Barbara Morris <bmorris@xxxxxxxxxx>]

Joe Pluta wrote:
> 
> I'm a little unclear as to how tightly typed the type O variables are.
> If I declare a type O variable as class Widget, must I instantiate an
> object of type Widget to stick in there?  Can I use a subclass of
> Widget?  Can I use a class that's NOT a subclass, provided the method I
> later invoke has the same signature?
> 

RPG doesn't do any checking on Object types.  Java does all the checking
for validity so the rules are the same as they are for Java.  I think
Java does a class check on the instance parameter, so while RPG would
let you pass say a String object as the instance for a Widget method,
the call would fail.  But you can pass a MyWidget object, if MyWidget is
a subclass of Widget.