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CastException for TableTreeItem [message #371050]

Tue, 17 June 2003 10:46

Eclipse User

Hi folks,

I get an error (under Win2K) when I want to cast the following:

public class MyItem extends TableTreeItem {
...
}

MyItem[] items = (MyItem[]) tableTree.getSelection();

getSelection will always return MyItems so I don't understand why there
is an exception thrown.
It seems to be more complicated because of if I do the following nothing
is thrown:

TableTreeItem[] items = tableTree.getSelection();
if (items.length == 1)
MyItem item = (MyItem) items[0];

Thanks in advance
Ralf

Re: CastException for TableTreeItem [message #371051 is a reply to message #371050]

Tue, 17 June 2003 11:09

Eclipse User

Originally posted by: richkulp.NOSPAM.us.ibm.com

I would imagine it is because the array returned from getSelection() is
of type TableTreeItem[] and not MyItem[]. The only way it could be
TabeTreeITem[] is if you overrode getSelection() to return that.

Just because all of the items in an array may be of type MyItem, that
doesn't make the array to be of type MyItem[]. The type of array is
determined before any items are placed into it. It is determined when it
is created.

Rich

Re: CastException for TableTreeItem [message #371053 is a reply to message #371051]

Tue, 17 June 2003 11:25

Eclipse User

Hello Richard,

thank you very much. I understand now.

Ralf

Richard L. Kulp schrieb:
> I would imagine it is because the array returned from getSelection() is
> of type TableTreeItem[] and not MyItem[]. The only way it could be
> TabeTreeITem[] is if you overrode getSelection() to return that.
>
> Just because all of the items in an array may be of type MyItem, that
> doesn't make the array to be of type MyItem[]. The type of array is
> determined before any items are placed into it. It is determined when it
> is created.
>
> Rich
>

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