public static void main(String[] av) {
System.out.println("OA's version of getAttr returns: " + new OA().getAttr());
System.out.println("OB's version of getAttr returns: " + new OB().getAttr());
// Declared as OA, instantiated as OB, so gets OB's version of things.
OA c = new OB();
System.out.println("C's version of getAttr returns: " + c.getAttr());
}
int getAttr() {
System.out.println("In OB.getAttr");
super.getAttr(); // Just to show flow of control
return attr;
}