Graph-List

public Graph {

  ArrayList<LinkedList<Node>> verticesAndEdges;
  
  public Graph() {
    verticesAndEdges = new ArrayList<LinkedList<Node>>();
  }
  
  public void addVertedx(Node vertex) {
    LinkedList<Node> list = new LinkedList<>();
    list.add(vertex);
    verticesAndEdges.add(list);
  }
  
  public void addEdges(int from, int to) {
    LinkedList<Node> currentList = verticesAndEdges.get(from);
    Node dstNode = verticesAndEdges.get(to).get(0);
    currentList.add(dstNode);
  }

}