Defines the interface for classes that will provide data to
a clipboard. An instance of this interface becomes the owner
of the contents of a clipboard (clipboard owner) if it is
passed as an argument to
setContents(Transferable, ClipboardOwner) method of
the clipboard and this method returns successfully.
The instance remains the clipboard owner until another application
or another object within this application asserts ownership
of this clipboard.
(Clipboard clipboard, Transferable contents)
Notifies this object that it is no longer the clipboard owner.
This method will be called when another application or another
object within this application asserts ownership of the clipboard.
||the clipboard that is no longer owned
||the contents which this owner had placed on the clipboard