Failed in created an object of protected inner class

[Bruce Sam]

I have created an interface Car with at least one method price(),
in its own package sam.bruce.c01. And then created a class in a
separate package sam.bruce.c02. Add a protected inner class NewCar that
implements the interface Car. In a third package sam.bruce.c03, inherit
from my class and, inside a method, return an object of the protected
inner class, upcasting to the interface during the return.Above is all
I want to do.My java code is list below:

/* ********************* */
package sam.bruce.c01;


public interface Car {
int price();
}
/* ********************* */
package sam.bruce.c02;

import sam.bruce.c01;


public class MyCar1 {
private int m_price = 10;
protected class NewCar implements Car {
public int price() {
return m_price;
}
}
}
/* ********************* */
package sam.bruce.c03;

import sam.bruce.c02;

public class MyCar2 extends MyCar1 {
public void getCar() {
MyCar1 p = new MyCar1();
MyCar1.NewCar pnew = p.new MyCar1.NewCar(); //error
}

public static void main(String[] args) { }
}
/* ****************** */

I failed in created an object of protected inner class.What is
the correct method to do this?