I have an interface
public interface Inter {
int interAttr = 0;
}
And two classes that implements it, each one with an additional attribute and each one of different type.
@AllArgsConstructor
public class Impl1 implements Inter {
public int impl1Attr;
}
@AllArgsConstructor
public class Impl2 implements Inter {
public String impl2Attr;
}
And I have list of Inter
objects that are a mix of Impl1
and Impl2
public class main {
public static void main(String[] args) {
Impl1 i11 = new Impl1(0);
Impl1 i12 = new Impl1(1);
Impl2 i21 = new Impl2("zero");
Impl2 i22 = new Impl2("one");
List<inter> implList = new ArrayList<Inter>();
implList.add(i11);
implList.add(i12);
implList.add(i21);
implList.add(i22);
for (Inter el : implList){
// this of course works
int a = el.interAttr1;
// But how do I get access to impl1Attr and impl2Attr?
}
}
}
Of course I can query i11.impl1Attr
or impl21.impl2Attr
in the body of the main
But is there a way for me to have access to the attributes of the different implementations in the list in the for
loop?
I'm probably oversimplifying the problem, but is
instanceof
+ casting not an option?