How to insert "try - catch" in the below code:

import java.util.ArrayList; import java.util.List; import java.util.Queue; import java.util.Set; // The Jukebox class represents the body of the problem. Many of the interactions between the components of the system, // or between the system and the user, are channeled through here. public class JukeBox { private CDPlayer cdPlayer; private Set < CD > cdCollection; private SongSelector ts; private User user; public JukeBox(CDPlayer cdPlayer, User user, Set < CD > cdCollection, SongSelector ts) { this.cdPlayer = cdPlayer; this.user = user; this.cdCollection = cdCollection; this.ts = ts; }

public Song getCurrentSong() { return ts.getCurrentSong(); }

public CD selectNext() { return cdCollection.iterator().next(); }

public void setUser(User u) { this.user = u; } }

class SongSelector {

private Song currentSong;

public SongSelector(Song s) { currentSong = s; }

public void setSong(Song s) { currentSong = s; }

public Song getCurrentSong() { return currentSong; }

} // Like a real CD player, the CDP layer class supports storing just one CD at a time. The CDs that are not in play are stored in the jukebox. class CDPlayer { private Playlist p; private CD c; private Song s; /* Constructors. */ public CDPlayer(CD c, Playlist p, Song S) { this.c = c; this.p = p; this.s = S; } public CDPlayer(Playlist p) { this.p = p; } public CDPlayer(CD c) { this.c = c; } public CDPlayer(Song s) { this.s = s; } /* Playsong */ public Song getSong() { return s; } public void PlaySong(Song s) { this.s = s; } /* Getters and setters */ public Playlist getPlaylist() { return p; } public void setPlaylist(Playlist p) { this.p = p; } public CD getCD() { return c; } public void setCD(CD c) { this.c = c; } }

class Playlist { private Song song; private Queue < Song > queue; public Playlist(Song song, Queue < Song > queue) { this.song = queue.poll(); } public Song getNextSongToPlay() { return queue.peek(); } public void queueUpSong(Song song) { queue.add(song); } public void removeSong(Song song) { queue.remove(song); } public void shuffle() { } }

class CD { /* data for id, artist, songs*/ private int id; private String artist; private String songs;

public int getId() { return id; }

public void setId(int id) { this.id = id; }

public String getArtist() { return artist; }

public void setArtist(String artist) { this.artist = artist; }

public String getSongs() { return songs; }

public void setSongs(String song) { this.songs = song; }

// play the music public void play() {} }

class Song { /* data for id, CD (could be null), title, etc */ private int id; private String title; private String album;

public int getId() { return id; }

public void setId(int id) { this.id = id; }

public String getTitle() { return title; }

public void setTitle(String title) { this.title = title; }

public String getAlbum() { return album; }

public void setAlbum(String album) { this.album = album; }

// play the music public void play() {} }

class User { private String name; private long ID; public User(String name, long iD) { this.name = name; this.ID = iD; } public String getName() { return name; } public void setName(String name) { this.name = name; } public long getID() { return ID; } public void setID(long iD) { ID = iD; } public User getUser() { return this; } public static User addUser(String name, long iD) { return new User(name, iD); } }