数组列表 <Hashmap<String,Double[]> 将值分配给单个Double []

Question

I am able to assign the Hash-map values to List double[] using following code, but for each entry in the Hash-map, it is creating separate array.

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

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

How do I get all the entries into single array of double[].

Answer 1

You're making the same mistake again. You need to add Double to list, not arrays of Double. So similarly to what I said in your previous question , change your code like this:

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

To get array from the list after the list is fully built with values from your map:

Double[] arrayOfDoubles = empid.toArray(new Double[]{});