// Graph API (OP) // https://www.coursera.org/learn/algorithms-part2/lecture/4ZE6G/graph-api public class Graph{ private final int V; private Bag[] adj; public Graph(int V){ this.V = V; adj = (Bag[]) new Bag[V]; for (int v = 0; v < V; v++) adj[v] = new Bag(); } public void addEdge(int v, int w){ adj[v].add(w); adj[w].add(v); } public Iterable adj(int v){ // iterator for vertices adjacent to v return adj[v]; } }