回答編集履歴
2
Functionのimport static忘れ
test
CHANGED
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@@ -42,6 +42,8 @@
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import static java.util.stream.Collectors.*;
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import static java.util.function.Function.*;
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public class Main {
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1
import staticですっきり書いてみた
test
CHANGED
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@@ -27,3 +27,37 @@
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}
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```
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32
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33
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さらにStreamを使うとyuba様の回答のようになりますが、
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35
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それをimport staticを使って少しだけきれいに書いてみた
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36
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37
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```java
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import java.util.Map;
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41
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import java.util.Arrays;
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42
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import static java.util.stream.Collectors.*;
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public class Main {
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48
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public static void main(String[] args)
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{
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Map<String, Long> map = Arrays.asList("a", "a", "b")
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.stream()
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.collect(groupingBy(identity(), counting()));
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}
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}
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```
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