Question

public static void Dijk(HashMap<String, HashMap<String, Integer>> map, String go, String stop){
   PriorityQueue pq = new PriorityQueue();
    for (String x: map){

    }

  }

Why is the complier telling me I can’t use a foreach loop here?

Also this is smaller section of a large program but I haven’t had much experience with priority queues I want to use it to hold a <String, int> //or Integer am I doing this right? (Im using the PQ as a binary heap essentially) (this method will be implementing Dijkstra’s algorithm)

Thank you for your help/answers in advance!

Answer 1

Assuming you intend to iterate over the keys of the HashMap, you should try

for (String x: map.keySet()){

}

As for the priority queue, take a look at the Java collection PriorityQueue