import java.util.List;

public class CekInstanceofAman {
    public static void main(String[] args) {
        Object o = List.of("Budi", "Siti");
        if (o instanceof List<?> daftar) {   // wildcard polos: sah
            System.out.println("Ukuran: " + daftar.size());
            for (Object elemen : daftar) {
                System.out.println("Elemen: " + elemen);
            }
        }
    }
}