Music Organizer

Nama : Edgar Andrew Hutauruk
NRP : 05111740000166
Kelas : PBO-B

MusicOrganizer

 import java.util.ArrayList;  
 /**  
  * Write a description of class MusicOrganizer here.  
  *  
  * @author (your name)  
  * @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;  
   }  
 }  

MusicPlayer

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