Having major problems with arrays, please help

Question

Hi,
I'm writing a program to simulate a juke box using an array of strings to hold each track that is input. when the program starts, the user is asked the maximum number of songs to store, and this is passed to the constructor of the PlayList method, which sets up on array of Strings called queue with the total given.]
I have four options, one to add a song, one to play the first song in the queue and then remove it from the queue. One to display all the songs in playlist, and one to quit. NB it doesn't "play" the song it just displays a message saying "now playing - song name".
It all works UNTIL i choose option 2 (play first song and then remove it from the queue). This seems to work, but then when I choose to display all the songs, its not removed the right one, and now there's two of the same. I've been trying for hours with this, and it's really annoying me. Here's the PlayList class
public class PlayList
    //declare attributes
    private String [] queue;
    private int total;
    //declare constructor
    public PlayList(int numsongs)
        queue = new String [numsongs];
        total = 0;
    public boolean addToQueue(String track)
        if (!isFull())
            queue[total] = track;
            total++;
            return true;
        else
            return false;
    public boolean removeFromQueue()
        if (isEmpty())
            return false;
        else
            int i;
            //remove first item off queue -- queue[0]
            for (i=1; i <= total-1; i++)
                //rename the others
                queue[i] = queue[i-1];
            total--;
            return true;
    public boolean isEmpty()
        if (total == 0) return true;
        else return false;      
    public boolean isFull()
        if (total == queue.length)
            return true;
        else
            return false;
    public String getItem(int item)
        return queue[item-1];
    public int getTotal()
        return (total);
    And here's the code from the main class which is executed.
public class JukeBox
    public static void main(String[] args)
        //delcare variables
        int choice;
        PlayList playlist;
        int maxnum;
        String song;
        System.out.println("*** Jukebox simulator ***" + "\n");
        System.out.print("Maximum number of songs in playlist: ");
        maxnum = EasyIn.getInt();
        playlist = new PlayList(maxnum);
        do
            System.out.println("\n" + "[1] Add song to playlist");
            System.out.println("[2] Play first song in playlist");
            System.out.println("[3] Display list of songs in playlist");
            System.out.println("[4] Quit" + "\n");
            System.out.print("Enter choice  [1-4]: ");
            choice = EasyIn.getInt();
        //if statements for each case
        if (choice == 1)
            if (playlist.isFull())
                System.out.println("*** Cannot add song, playlist is full ***");               
            else
            System.out.print("Enter artist and song name - ");
            song = new String(EasyIn.getString());
            playlist.addToQueue(song);
            System.out.println("\n" + "*** Song added to playlist ***");
            System.out.println(song + "\n");
        if (choice == 2) //display first song in queue, and then remove it from the queue
            if (playlist.isEmpty())
                System.out.println("*** No songs in playlist ***");
            else
                System.out.println("*** Now playing: ***");
                System.out.println(playlist.getItem(1));
                playlist.removeFromQueue();
        if (choice ==3)
            if (playlist.isEmpty())
                System.out.println("*** No songs in playlist ***" + "\n");
                return;
                System.out.println("*** Songs currently in playlist ***");
                for (int i = 1; i <= playlist.getTotal(); i++)
                    System.out.println(playlist.getItem(i));
        if (choice == 4)
            System.out.println("*** Thank you for using the juke box simulator ***");
        while (choice != 4);
}Any ideas?

Answer 1

Hi,
I just realised that before u posyed (honest, I did hehe), and now my code its like this
public boolean removeFromQueue()
        int i;
        if (isEmpty())
            return false;
        else
            for (i=1; i <= total; i++)
                queue[i-1] = queue[i-];
            total--;
            return true;
    }But now I get IndexOutOfBoundsException :s