aspose file tools*
The moose likes Beginning Java and the fly likes Inheritance Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "Inheritance" Watch "Inheritance" New topic
Author

Inheritance

archu sweet
Ranch Hand

Joined: Mar 07, 2011
Posts: 66

I'm having an super class named Base :




Subclass named Sub:


I want to know when i invoke System.out.print(s.FOO);...The super class variable gets printed...when i invoke s.eat(); the sub class method gets invoked.......why does System.out.print(s.FOO); doesnot print subclass variable ???
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 40064
    
  28
Instance methods are polymorphic; they are called according to the runtime type of the object, ie Sub.
Everything else, including static fields, is not polymorphic, and called according to the declared type of the class, ie Base, in both cases. Base b = new Sub(); means its declared type is Base and its runtime type is Sub.
archu sweet
Ranch Hand

Joined: Mar 07, 2011
Posts: 66

@Campbell Ritchie :

Thanks !!
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 40064
    
  28
You're welcome
 
wood burning stoves
 
subject: Inheritance