java - Overriding with Superclass Reference for Subclass Object -

i have been moving through couple of books in order teach myself java , have, fortunately, due luck, encountered few difficulties. has changed.

i read section on following under inheritance , whole superclass subclass setup

-- when new superclass object created, is, objects, assigned reference (superreference in example)

-- if new subclass object (with defining subclass extending superclass) created, , superreference reference set refer instead of original object, understanding that, since reference made superclass, members defined superclass may accessed subclass.

first - correct?

second: if overriding method , therefore have 1 in super , 1 in sub, , create superclass object , assign reference, did above, subclass object, principle called dynamic method dispatch, called overridden method should default accessing subclass method right?

well, question is:

if reference superclass-object retooled subclass-object , deny direct object.member access subclass-defined members, supporting superclass-defined members, how can, if superclass reference retooled subclass object, overridden method apply subclass-object if access limited superclass-originated-reference-

if try like:

class superclass{     int intvar = 0;     void method(){         //in super class     } } class subclass extends superclass{     int intvar = 2;     void method(){         //in sub class     } } 

then

superclass obj = new subclass(); int val = obj.intvar;// taken superclass variables decided on reference basis //if both superclass , subclass contain same variable called shadowing obj.method();// taken subclass method overriding  //and decided @ runtime based on object not reference   

check comments. hope helps.