TUGAS PBO-B (MUSIC PLAYER)

Gambar Class:

Source code MusicOrganizer :

import java.util.ArrayList;
/**
 * Write a description of class MusicOrganizer here.
 *
 * @author (Faizal Mabrury)
 * @version (a version number or a date)
 */
public class MusicOrganizer
{
    private ArrayList<String> files;
    private MusicPlayer player;
    public MusicOrganizer()
    {
        files = new ArrayList<String>();
        player = new MusicPlayer();
    }
    public void addFile(String filename)
    {
        files.add(filename);
    }
    public int getNumberOffFiles()
    {
        return files.size();
    }
    public void listFile(int index)
    {
        if(index >=0 && index <files.size())
        {
            String filename = files.get(index);
            System.out.println(filename);
        }
    }
    public void listAllFiles()
    {
        int i=0;
        for(String filename : files)
        {
            System.out.println(i+":"+filename);
            i++;
        }
    }
    public void removeFile(int index)
    {
        if(index >=0 && index <files.size())
        {
            files.remove(index);
        }
    }
    public void startPlaying(int index)
    {
        if(validIndex(index))
        {
            String filename = files.get(index);
            player.startPlaying(filename); 
        }
    }
    public void playAndWait(int index) 
    {
        if(validIndex(index))
        {
            String filename = files.get(index);
            player.startPlaying(filename);
        }
    }
    public boolean validIndex(int index)
    {
        boolean valid;
        if(index<0)
        {
            System.out.println("Index cannot be negative: "+index);
            valid = false;
        }
        else if(index>= files.size())
        {
            System.out.println("Index is too large: "+ index); 
            valid=false; 
        }
        else
        {
            valid = true;
        }
        return valid;
    }
}

Source code MusicPlayer:

/**
 * Write a description of class MusicPlayer here.
 *
 * @author (Faizal Mabrury)
 * @version (a version number or a date)
 */
public class MusicPlayer
{
    private String Music;
    public MusicPlayer()
    {
        Music = "Lagu tidak ditemukan";
    }
    public void startPlaying(String filename)
    {
        Music = filename;
        System.out.println("Sedang memutar :"+Music);
    }
}

Gambar: