Question

I’m trying to assign Hashmap values of Double[] to List, but it is throwing an error:

“The method add(Double) in the type List is not applicable for the arguments
(Double[])”

ArrayList<HashMap<String, Double[]>> arl = (ArrayList<HashMap<String, Double[]>>) pd.getArrayList();

List<Double> empid = new ArrayList<Double>();
Iterator itr = arl.iterator();

while (itr.hasNext()) {
    HashMap<String, Double[]> map = (HashMap<String, Double[]>) itr.next();
    empid.add(map.get("id")));
}

How can I cast Double[] to Double.Request?

Answer 1

What you seem to be looking is this line:

empid.add(map.get("id")));

changed to this:

empid.addAll(Arrays.asList(map.get("id"))));

It will convert an array of Double to a List of Double, and addAll will add all items from the resulting collection to your target collection empid.