Copy nested objects in Java

So I have the following classes:

class A{
    public A(int n1){
        n=n1;
    }
    int n;
}

class B extends A{
    public B(int n2){
        super(n2);
        cnt=1;
    }
    int cnt;
}
class C extends B{
    public C(int n3){
        super(n3);
        clr="red";
    }
    String clr;
}

public class Driver {
    public static void main(String[] args){
        A a,b,c,d,e;
        a=new B(200); d=a.copy();
        b=new C(100); e=b.copy();
    }
}

I am asked to define the method copy() in classes A,B,C. The copy method essentially makes a copy of all nested objects.

I have 2 questions:

1. I don't see any nested objects being constructed, why does he ask me to make a copy of all nested objects? Is it because when I construct a subclass object, a base class object is constructed and nests inside the subclass object?

2. Is it correct to write the method as follows (take class B for example):

class B extends A{
    public B(int n2){
        super(n2);
        cnt=1;
    }
    int cnt;
    public A copy(){
        A copy_ref=new B(1);
        ((B)copy_ref).cnt=this.cnt;
        copy_ref.n=super.n;
        return copy_ref;
    }
}