BreenDeen :
I want to find the sum of the List<int[]> using Java 8. Here is my attempt.
int sum = counts.stream().flatMap(i -> Stream.of(i).mapToInt(m)).sum();
However, I get the error cannot convert to Stream<Object> to <unknown>.
Ward :
You want to flatMap to an IntStream. After that, taking the sum is easy.
int sum = counts.stream()
.flatMapToInt(IntStream::of)
.sum();
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