回答編集履歴
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test
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* https://docs.oracle.com/javase/jp/17/docs/api/java.base/java/util/stream/Stream.html#of(T...)
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* https://docs.oracle.com/javase/jp/17/docs/api/java.base/java/util/stream/Stream.html#filter(java.util.function.Predicate)
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* https://docs.oracle.com/javase/jp/17/docs/api/java.base/java/util/stream/Stream.html#collect(java.util.stream.Collector)
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* https://docs.oracle.com/javase/jp/17/docs/api/java.base/java/util/stream/Collectors.html#joining(java.lang.CharSequence)
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```java
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import org.junit.jupiter.api.Test;
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import java.util.stream.Collectors;
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