ClassCastException : cant be cast to java.lang.Integer

Question

I know this has been asked a lot in stackoverflow but I could not find answers that work to my problem.

In the following code below, I cant print out each item in

Answer 1

private HashMapArrayList>  edges;

// ...later

Edge e = new Edge(from,to,T);

// ...later

else {
    tmp = new ArrayList();
    edges.put(e.from,tmp);
}
tmp.add(e);

Ultimately, this is a classic example of why raw types are bad. You've got an ArrayList and you put Edges in it.

Unfortunately, I don't know how to tell you how to fix it since I don't understand what you're trying to do.