Question

1. Is there a better way to add a list to another existing list than what I have coded in the add method ?

2. Is the way to remove a list of songs from a playlist correct or am I going to hit concurrent modification exception ?

   class Playlist
   {
   List<Song> playList;
   public void addSongs(List<Song> songs)
   {
     for(Song s:songs)
     playList.add(s);
   }
   
   public void removeSongs(List<Song> songs)
   {
     for(Song s:songs)
     if(playList.contains(s))
     playList.remove(s);
   }
   
   
   }
   

Answer 1

To add all the elements from one list to another, use;

List.addAll

Appends all of the elements in the specified collection to the end of
this list, in the order that they are returned by the specified
collection’s iterator

To remove all the elements from one list from another use;

List.removeAll

Removes from this list all of its elements that are contained in the
specified collection