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Message:

call subclass method from a superclass

Posted by Erik Buitenhuis on July 04, 2000 at 6:37 AM

From inside a superclass method I want to call another method that exists in that superclass, but is overridden by some of it's subclasses. see below:

class super {
void m1 (super s) {
// call method m2 of the (sub)class that s is an instance of
// the line below has invalid syntax but shows what I want:
// typecast s to s.getClass() and call the subclass's m2.
((s.getClass())s).m2();
}
void m2 () { ... }
}

class sub1 {
void m2 () { ... }
}

class sub2 {
void m2 () { ... }
}

All this without the superclass having to know what actual subclasses do exist (so I don't want to "switch ((s.getClass())"
over possible subclasses).

Anybody know how to do this????
-Erik

• RE: call subclass method from a superclass Kishori Sharan July 05, 2000 at 2:38 PM (4)
  • reg my doubts mala February 01, 2001 at 2:20 AM (2)
    • doubt chandu May 03, 2001 at 7:10 AM (1)
      • reply.... Ramaz January 18, 2002 at 12:56 AM (0)
  • solution Erik Buitenhuis July 18, 2000 at 4:11 AM (0)