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Clone Collection in Java
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clone-collection-in-java.md

Clone Collection in Java

Java のコレクションをクローンする場合のメモです。

Environment

  • Java 1.8
  • Apache Commons Lang 3.9

List

Collections.unmodifiableList(
    original.stream().map(SerializationUtils::clone).collect(Collectors.toList()));

Map

Collections.unmodifiableMap(
    original.entrySet().stream().collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)));
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