Find the Weak Connected Component in the Directed Graph

public class Solution {
    class UnionFind {
        HashMap<Integer, Integer> father = new HashMap<Integer, Integer>();
        UnionFind(HashSet<Integer> hashSet) {
            for(Integer now : hashSet) {
                father.put(now, now);
            }
        }
        int find(int x) {
            int parent =  father.get(x);

            while(parent != father.get(parent)) {
                parent = father.get(parent);
            }

            return parent;
        }
        int compressed_find(int x) {
            int parent =  father.get(x);

            while (parent != father.get(parent)) {
                parent = father.get(parent);
            }

            int temp = -1;
            int fa = father.get(x);

            while (fa != father.get(fa)) {
                temp = father.get(fa);
                father.put(fa, parent) ;
                fa = temp;
            }

            return parent;

        }

        void union(int x, int y) {
            int fa_x = find(x);
            int fa_y = find(y);

            if (fa_x != fa_y)
                father.put(fa_x, fa_y);
        }
    }
    
    List<List<Integer>>  print(HashSet<Integer> hashSet, UnionFind uf) {
        List<List<Integer>> ans = new ArrayList<List<Integer>>();
        HashMap<Integer, List <Integer>> hashMap = new HashMap<Integer, List<Integer>>();

        for (int i : hashSet) {
            int fa = uf.find(i);

            if (!hashMap.containsKey(fa)) {
                hashMap.put(fa,  new ArrayList<Integer>());
            }

            List<Integer> now =  hashMap.get(fa);
            now.add(i);
            hashMap.put(fa, now);
        }

        for (List<Integer> now: hashMap.values()) {
            Collections.sort(now);
            ans.add(now);
        }

        return ans;
    }

    public List<List<Integer>> connectedSet2(ArrayList<DirectedGraphNode> nodes) {
        HashSet<Integer> hashSet = new HashSet<Integer>();

        for (DirectedGraphNode now : nodes) {
            hashSet.add(now.label);

        for (DirectedGraphNode neighbour : now.neighbors) {
                hashSet.add(neighbour.label);
            }
        }

        UnionFind uf = new UnionFind(hashSet);

        for(DirectedGraphNode now : nodes) {
            for(DirectedGraphNode neighbour : now.neighbors) {
                int fnow = uf.find(now.label);
                int fneighbour = uf.find(neighbour.label);

                if (fnow != fneighbour) {
                    uf.union(now.label, neighbour.label);
                }
            }
        }
        return print(hashSet , uf);
    }
}