CS535 Object-Oriented Programming & Design
Fall Semester, 1996
Doc 9, Inheritance pt 2, Overriding and Hiding

Doc 9, Inheritance pt 2, Overriding and Hiding Slide # 1

• The OO gods have decreed that overriding methods is good
• The OO gods have decreed that resolving overridden methods dynamically is very good

This is polymorphism, examples showing why this is good later

• Resolving hidden fields can not be done dynamically

class  Parent  {
   public  int  name  =  5;

   public  void  test() {
      System.out.println( "In Parent \t" + (name / 3) );
   }
}

class  Child  extends  Parent  {
   public String  name  =  "Can't divide me";
}

class FieldsMustBeResolveStaticly {

   public static void main( String args[] ) {

      Child  trouble  =  new Child();
      trouble.test();
   }
}

• Either resolving hidden fields statically or do not allow fields to be hidden