Question

I am adding information from main()
I am adding different information for CD, DVD, book..

I have 3 separate classes – item has 3 classes in it…

1. project – main()

2. Library – this function does all the adding

3. Item(cd,dvd,book) inheritance

For Music i am adding band info, title info, keywords, and members..
I am adding members separately than of the other info..

As you can see the members is not outputing correctly as the others..

>>> music CDs:

-Music-
band: Jerry Garcia Band
# songs: 15
members: [Ljava.lang.String;@61de33
title: Don't Let Go

C:\Java\a03>

I am using the same toString() function for members as i am the rest, so i am not sure why it would do this..

I will give you as much info as i think you need to see..

Main() – as you can see it calls 2 different functions.

the addbandmembers is where i am having problems…

out.println(">>> adding items to library:\n");
item = library.addMusicCD("Europe In '72", "Grateful Dead", 12, "acid rock", "sixties", "jam bands");
    if (item != null) {
        library.addBandMembers(item, "Jerry Garcia", "Bill Kreutzman", "Keith Godcheaux");
        library.printItem(out, item);
        }

in Library class – here is the addbandmember function ..

Could this be the cause??

public void addBandMembers(Item musicCD, String... members)
{

    ((CD)musicCD).addband(members);

}

In the Items class here is the function addband – tostring()

here is the CD class which extends the items class..

class Item
{
    private String title;

    public String toString()
    {
        String line1 = "title: " + title + "\n";
        return line1;
    }

    public void print()
    {
        System.out.println(toString());
    }

    public Item()
    {}

    public Item(String theTitle)
    {
        title = theTitle;
    }

    public String getTitle()
    {
        return title;
    }
}

class CD extends Item
{
    private String artist;
    private String [] members;
    private int number;

    public CD(String theTitle, String theBand, int Snumber, String... keywords)
    {
        super(theTitle);
        this.artist = theBand;
        this.number = Snumber;
    }

    public void addband(String... member)
    {
        this.members = member;
    }

    public String getArtist()
    {
        return artist;
    }

    public String [] getMembers()
    {
        return members;   
    }

    public String toString()
    {
        return  "-Music-" + "\n" + "band: " + artist + "\n" + "# songs: " + number + "\n" + "members: " + members + "\n"  + "\n" + super.toString() + "\n";
    }

    public void print()
    {
        System.out.println(toString());
    }
}

I do have other information in the items class like a nook class, movie class that i didnt show. I would like to keep everything the way i have it set up..

So, if the other items are printing fine than maybe its the cast in the addbandmember function thats giving me problems?

Answer 1

Arrays don’t have a useful toString() implementation. You can print out the members in a loop or use the Arrays.toString() method to do this for you:

return "-Music-" + "\n"
    + "band: " + artist + "\n"
    + "# songs: " + number + "\n"
    + "members: " + Arrays.toString(members) + "\n"
    + "\n"
    + super.toString() + "\n";