Transform HashMap to HashMap>()

Question

I have this code,

ArrayList<HashMap<String, String>> eventosList;

     HashMap<String, String> contact = new HashMap<String, String>();

                            contact.put("id", id);
                            contact.put("name", name);

eventosList.add(contact);

Is it possible to transform this HashMap<String, String> contact to HashMap<String, List<String>>() contact? How can I do this? Thank you so much

You are wanting something like this? HashMap> contact = new HashMap>(); — JpCrow, Nov 29 '14 at 16:17
I am wanting something like this HashMap>() but I have this HashMap — user1096087, Nov 29 '14 at 16:19

score 0 · Answer 1 · answered Nov 29 '14 at 16:23

How about this?

    ArrayList<HashMap<String, List<String>>> eventosList = new ArrayList<HashMap<String, List<String>>>();

    HashMap<String, List<String>> contact = new HashMap<String, List<String>>();
    contact.put("id", list1);
    contact.put("name", list2);

    eventosList.add(contact);

score 0 · Accepted Answer · edited May 23 '17 at 11:57

Try like this:

ArrayList<HashMap<String, List<String>>> eventosList = new ArrayList<HashMap<String, List<String>>>();
HashMap<String, List<String>> contact = new HashMap<String, List<String>>();

List<String> list = new ArrayList<String>();
list.add("1");
list.add("2");
contact.put("id", list);
List<String> list1 = new ArrayList<String>();
list1.add("Mohammed");
list1.add("Ali");
contact.put("name", list1);
eventosList.add(contact);

Also Note as given here: List is an INTERFACE, and you cannot Initialize an Interface, so use any of its implementing classes like Arraylist, Vector, LinkedList, AbstractList, AbstractSequentialList, AttributeList, etc, to initialize it.

Transform HashMap to HashMap>()

2 Answers2