Adding in change to Edge Node to GraphNode and making a GraphNode interface to the Node class, as we don't need the other memebers of Generic Node for a Graph Node in this case

src/Edge.java

@@ -1,6 +1,6 @@
 public class Edge {
-    Node source;
-    Node destination;
+    GraphNode source;
+    GraphNode destination;
     int weight;
 
     public Edge(Node source, Node destination, int weight) {

src/Node.java

@@ -4,6 +4,7 @@ import java.util.List;
 interface GraphNode {
     String name = "";
     List<Edge> edges = new ArrayList<Edge>();
+    String getName();
 }
 
 public class Node implements GraphNode {