mati23

public static Main(ArrayList<Transactions> transactions){
    HashMap<String, ArrayList<Transactions>> hashMap = new HashMat<>();
    for(Transaction transaction : transactions){
        if(hashMap.get(transaction.hashCode()) == null){
            ArrayList<Transaction> arrayList = new ArrayList();
            arrayList.add(transaction);
            hashMap.put(transaction.hashCode(), arrayList);
        }else{
            arrayList = hashMap.get(hashCode());