import java.util.*;
public class Client {
    public static void main(String[] args) {
        MusicPlayer p1 = new MusicPlayer();
        MP3Player p2 = new MP3Player();
        CDPlayer p3 = new CDPlayer();
        IPhone p4 = new IPhone();

        /*
        System.out.print("p1: ");
        p1.play();
        System.out.print("p2: ");
        p2.selectSong("All Star");
        p2.play();
        System.out.print("p3: ");
        p3.play();
        System.out.print("p4: ");
        p4.selectSong("Happy Birthday");
        p4.play();
        */
        
        // p4.record(); COMPILER ERROR: can't find symbol
        
        // p2.makeCall(8675309); same compiler error
        
        // left hand side: promise type, declared type, reference type
        // right hand side: actual type, object type, implementation type

        //MP3Player p5 = new IPhone();
        //((IPhone)p5).makeCall(8675309);
        
        List<MP3Player> list = new ArrayList<MP3Player>();
        list.add(new IPhone());
        list.add(new Zune());
        list.add(new IPod());
        list.add(new MP3Player());
        
        ((IPhone)list.get(0)).makeCall(8675309);
        ((IPhone)list.get(0)).playSolitare();
        ((Zune)list.get(1)).useRadio(92.5);
        ((IPod)list.get(2)).playSolitare();
        ((IPhone)list.get(3)).selectSong("Twinkle Twinkle Little Star");
        list.get(3).play();
    }
}