回答編集履歴
1
list.toArray(Data[]::new)からlist.stream().toArray(Data[]::new)に変更
answer
CHANGED
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@@ -2,7 +2,7 @@
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2
2
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3
3
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```Java
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4
4
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public static Map<Integer, Map<Integer, Data[]>> toArrayMap(Map<Integer, Map<Integer, List<Data>>> listMap) {
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5
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-
return transformValues(listMap, map -> transformValues(map, list -> list.toArray(Data[]::new)));
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5
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+
return transformValues(listMap, map -> transformValues(map, list -> list.stream().toArray(Data[]::new)));
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6
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}
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7
7
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public static <S, T, U> Map<S, U> transformValues(Map<S, T> map, Function<T, U> transformer) {
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