Classx is not abstract and does not override abstract method methodx(java.lang.Object) in Interfacex

Question

http://pastebin.com/m64305b4

Appreciate any help.

Answer 1

You should add the @Override annotation to the addNode() implementation in ListGraph:

@Override
public void addNode(N node){
    nodes.put(node, new ArrayList<ListEdge<N>>());
}

Answer 2

Change

public class ListGraph<N> implements graphs.Graph

to

public class ListGraph<N> implements graphs.Graph<N>

You're implementing a generic interface, so you have to provide the piece in the angle brackets. (sorry, brain gone blank, can't remember the exact terminology)