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UtilsForCollections.java

public static <T> String join(T[] array, String separator) {
    return UtilsForCollections.join(array, separator, 0);
}
public static <T> String join(T[] array, String separator, int limit) {
    if (limit > 0 && array.length > limit) {
        return Arrays.stream(array)
          .limit(limit)
          .map(String::valueOf)
          .collect(Collectors.joining(separator)) + separator + "...";
    }
    return Arrays.stream(array).map(String::valueOf)
      .collect(Collectors.joining(separator));
}
public static <T> String join(Collection<T> collection, String separator) {
    return UtilsForCollections.join(collection, separator, 0);
}
public static <T> String join(Collection<T> collection, String separator, int limit) {
    if (limit > 0 && collection.size() > limit) {
        return collection.stream()
          .limit(limit)
          .map(String::valueOf)
          .collect(Collectors.joining(separator)) + separator + "...";
    }
    return collection.stream().map(String::valueOf)
      .collect(Collectors.joining(separator));
}