What is a good class design for node-connection situation?

What is a good class design for node-connection situation?

I want to design a map like in traveling salesman problem.
There are a number of nodes, some connected to another.
One node can be connected to many other nodes.
I have designed some, which one is better ? Or maybe there are another
better design ?
1.)
class Node {
private int ID;
private int position-x;
private int position-y;
}
class Connection {
private int ID;
private Node first;
private Node second;
public void ConnectTwoNodes( Node a, Node b ) { ... }
}
2.)
class Node {
private int ID;
private int position-x;
private int position-y;
private ArrayList<Node> anotherNodes; // array of connected nodes
public void ConnectTo( Node another ) { ... }
}