Re: [jgrapht-developers] Edge vertex types

[John V. S. <js...@gm...>]

I just tried it exactly as you have it below and it worked for me with
no compiler error.

Did you somehow pick up a type-erased version of one of the classes,
maybe a classpath problem?

JVS

On Wed, 2005-12-14 at 00:46 -0500, Charles Fry wrote:
> Hi,
> 
> I am getting an error when compiling the following block of code:
> 
> public class NeighborIndex<V, E extends Edge<V>> implements GraphListener<V, E>
> {
>    public void edgeAdded(GraphEdgeChangeEvent<V, E> e)
>    {
>        E edge = e.getEdge();
>        V source = edge.getSource();
>    }
> }
> 
> The error is:
> 
>    incompatible types
>    found   : java.lang.Object
>    required: V
>            V source = edge.getSource();
>                                     ^
> 
> My understanding of generics suggests that the compiler should have
> already known that E extends Edge<V>, and should thus have expected V
> instead of Object in the above block of code. Obviously I was wrong. Any
> suggestions as to what I am missing, and how I can fix this?
> 
> thanks,
> Charles
>