Strange, 'Cannot find symbol' error

[mhouldridge]

Java Experts,

I have added a JList to the GUI of my application. When running the project I received the error, 'Cannot find symbol' with, 'setListData' underlined. here's the code:

private void displayGroup()
{
Collection<Team> teams = football.getTeams();
teamList4.setListData(teams);
teamList4.setSelectedIndex(0);
}

I have followed an example from a textbook, so I'm curious what error has been made here.

Please help.

[Fubarable]

Look up in the API what JList#setListData takes for its parameter. According to the API that I've just looked at, there are two possible choices here, but Collection is not one of them.

[mtyoung]

setListData intake array or vector, not collection, vector implements collection, but collection is not vector

[mhouldridge]

Hi,

I have looked at the autocomplete for the JList which shows:

setListData(Object[])
setListData(Vector[])

I thought Object was a generic type which could accept any variable type?

[Fubarable]

That's not Object, that says Object[], and that's a big difference. It will accept an array of any object, but Collection<...> is not an array.

[mhouldridge]

Thanks, just realised this.

Could you advise how I can convert my Collection to an object array.

[mhouldridge]

toArray() has done it, doh!

thanks