// load in parallel
    for (Path path : paths) {
        ForkJoinPool.commonPool().submit(() -> {
        //i should  start a thread on the fork join pool
            Graph privateGraph = new Graph();

            // load private graph from path

            return privateGraph;
        });
    }

    // wait for all threads to be finished (future.get() waits until it returns)
    List<Graph> loadedSubGraphs = new ArrayList<>();
    for (Future<Graph> subGraphsFuture : subGraphsFutures) {
        try {
            Graph subGraph = subGraphsFuture.get();
            loadedSubGraphs.add(subGraph);
        } catch (InterruptedException | ExecutionException e) {
            throw new Error(e);
        }
    }

    // merging
    Graph graph = new Graph();
    for (Graph loadedGraph : loadedSubGraphs) {
        // merge graphs into graph
    }

    return graph;
}