On Mon Jun 30 16:20:50 UTC 2014, Joe Darcy <[email protected]> wrote:
> It was not immediately clear how javax.swing.tree.TreeNode.children(),
> which returns a raw Enumeration, should be generified. I changed it to
> Enumeration<TreeNode> children(); and that seems to work fine. Something like
> Enumeration<? extends TreeNode> with a covariant override would save a few
> casts in a private
> implementation, but generally doesn't seem to be a good trade-off since
> many normal clients could be inconvenienced dealing with the wildcard.
Hi Joe,
We have a few implementations of TreeNode that look like this:
class MyTreeNode implements TreeNode {
public Enumeration<MyTreeNode> children() { ... }
}
They don't compile any more after the change to TreeNode. Maybe something like
this would have fewer compatibility issues?
public interface TreeNode<C extends TreeNode>
{
...
Enumeration<C> children();
...
}
Regards,
Robert
