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I got this code from tutorial horizon and I'm trying to modify it to get it to:
a) only output the shortest path from source to destination, current shortest path to all nodes from source
b) output the pathway to the shortest path
Any help would be greatly appreciated.
Thanks

static class Edge 
 int start;
 int end;
 int weight;
 int length;
 Edge previous;

 public Edge(int start, int end, int weight) 
 this.start = start;
 this.end = end;
 this.weight = weight;
 //this.length = length;
 

static class ResultSet
 int parent;
 int weight;


static class Graph {
 int vertex;
 LinkedList<Edge> adjacencylist[];

 Graph(int vertex) 
 this.vertex = vertex;
 adjacencylist = new LinkedList[vertex];
 for (int i = 0; i < vertex; i++) 
 adjacencylist[i] = new LinkedList<>();
 
 


 public void addEdge(int start, int end, int weight) 
 Edge edge = new Edge(start, end, weight);
 adjacencylist[start].addFirst(edge);

 edge = new Edge(end,start,weight);
 adjacencylist[end].addFirst(edge);
 

 public ArrayList<String> dijkstra(int startvertex)
 boolean[] SPT = new boolean[vertex];
 int[] distance = new int[vertex];
 for(int i =0; i<vertex;i++)
 distance[i] = Integer.MAX_VALUE;
 
 PriorityQueue<Pair<Integer,Integer>> pq = new PriorityQueue<>(vertex, new Comparator<Pair<Integer, Integer>>() 
 @Override
 public int compare(Pair<Integer, Integer> o1, Pair<Integer, Integer> o2) 
 int key1 = o1.getKey();
 int key2 = o2.getKey();
 return key1 - key2;
 
 );
 distance[0] = 0;
 Pair<Integer,Integer> p0 = new Pair<>(distance[0],0);
 pq.offer(p0);
 while(!pq.isEmpty())
 Pair<Integer,Integer> extractedPair = pq.poll();
 int extractedVertex = extractedPair.getValue();
 if(SPT[extractedVertex]==false)
 SPT[extractedVertex] = true;
 LinkedList<Edge> list = adjacencylist[extractedVertex];
 for (int i = 0; i<list.size();i++)
 Edge edge = list.get(i);
 //System.out.println(edge.start + ":" + edge.weight + ":" + edge.end);
 int end = edge.end;
 if(SPT[end] == false)
 int newKey = distance[extractedVertex] + edge.weight;
 int currentKey = distance[end];
 if(currentKey>newKey)
 Pair<Integer,Integer> p = new Pair<>(newKey,end);
 pq.offer(p);
 distance[end] = newKey;
 
 
 
 
 
 printDijkstra(distance,startvertex);
 ArrayList<String> stuff = checkDijkstra(distance,startvertex);
 return stuff;