Convert List<Object[]> Array into Map

Question

I am trying to make a Hashmap out of a List of Objects[] but I am unable to do so. Below is the code that I have written:

List<Object[]> adjustments =  query.getResultList();
Map<Integer, BigDecimal> dpaMap = adjustments.stream().collect(Collectors.toMap(a -> (Integer)a[0], a -> (BigDecimal)a[1]));

I know that only two fields are returning from the query they have the same Type as mentioned in Map, but its not working. Please guide me in this regard.

Thanks In Advance.

Your code works fine to me (when the Object[] arrays contain what you say they do). I tried : List<Object[]> adjustments = new ArrayList<Object[]>(); adjustments.add (new Object[] {Integer.valueOf (5),new BigDecimal(4)}); adjustments.add (new Object[] {Integer.valueOf (55),new BigDecimal(48)}); Map<Integer, BigDecimal> dpaMap = adjustments.stream().collect(Collectors.toMap(a -> (Integer)a[0], a -> (BigDecimal)a[1])); — Eran
– Eran, Commented Oct 27, 2016 at 9:30
@Eran When I am debugging the code, it doesn't recognize a[0] and a[1] and when the 2nd line executes, it throws an exception — Muhammad Umer
– Muhammad Umer, Commented Oct 27, 2016 at 9:32

Muhammad Umer · Accepted Answer · 2016-10-27 09:45:35Z

7

So it seems that it was working fine, the column in the DB was returning Float so just had to cast it to BigDecimal

Map<Integer, BigDecimal> dpaMap = adjustments.stream().collect(Collectors.toMap(a -> (Integer)a[0], a -> BigDecimal.valueOf((Float) a[1])));

Thanks a lot people for your help.

answered Oct 27, 2016 at 9:45

Muhammad Umer

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