java - Hide a field from a superclass in a subclass -

let's have 3 classes:

class foo {         protected string var;     public void dosomething()     {          // var     } }  class extends foo {     public void dosomething()     {         // uses var differently foo     } }  class b extends foo {     protected int var; // hides foo's var field     public void dosomething()     {         // b's var, still in similar fashion foo     } } 

in case, know , want b's var field hide foo's , still used in similar way (printing value or performing calculation or whatever).
intentionally hiding fields can make code hard read, exception that, or still poor design?

edit:
want inherit 'var' foo i'd b inherit except var.

edit 2:
forgot add access modifiers var.

you can't "override" fields in same way methods can overridden. you'll need use method overriding implement behavior. example:

class foo {         private string var;      object getvar() {         return var;     } }  class b extends foo {     private int var;      @override     object getvar() {         return var;     } } 

edit: based on comment:

foo's var of type list<string>, , b's var of type list<item> item separate class together. can tell, both use lists different template types, , both still same thing (go through list , elements)

it sounds classes should generic, example:

abstract class foo<t> {      list<t> list;      // common logic }  class extends foo<string> { }  class b extends foo<item> { } 

don't take code literally - it's suggest possible design.