java 8 hashmap example stackoverflow

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1Optional<List> o = id1.entrySet()
2                      .stream()
3                      .filter( e -> e.getKey() == 1)
4                      .map(Map.Entry::getValue)
5                      .findFirst();

1List<List> list = id1.entrySet()
2                     .stream()
3                     .filter(.. some predicate...)
4                     .map(Map.Entry::getValue)
5                     .collect(Collectors.toList());

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