回答編集履歴
1
flatMapの閉じ括弧追加
test
CHANGED
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@@ -24,6 +24,6 @@
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String[] str={"ABC","DEFG","HI","KLM"};
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27
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-
String[] result = Arrays.stream(str).flatMap(s -> Arrays.stream(s.split("")).toArray(String[]::new);
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27
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+
String[] result = Arrays.stream(str).flatMap(s -> Arrays.stream(s.split(""))).toArray(String[]::new);
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```
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