package package2;
import package1.C1;

public class C2 extends C1 {
    public C2() {}
    public int mpub(C1 o1) {
        return o1.mprot();   // error, can't call mprot on an object of type C1
    }
    public static void main(String [] argv) {
        C1 o1 = new C1();
        C2 o2 = new C2();
        System.out.println("Call returns " + o2.mpub(o1));
    }

}