回答編集履歴
1
flatMapの閉じ括弧追加
answer
CHANGED
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@@ -11,5 +11,5 @@
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11
11
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その2：Stream利用で1文に
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12
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```java
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String[] str={"ABC","DEFG","HI","KLM"};
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14
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-
String[] result = Arrays.stream(str).flatMap(s -> Arrays.stream(s.split("")).toArray(String[]::new);
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14
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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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