A nice interface to concatenating multiple lists in java.

Java concat Lists.java

  @SafeVarargs
  public static <T> List<T> concat(List<T>... lists) {
    return Stream.of(lists)
        .reduce(
            new ArrayList<T>(),
            (resultList, currentList) -> {
              resultList.addAll(currentList);
              return resultList;
            });
  }
  
  // Example if you have list1, list2, list3:
  // List<T> someNewHybridList = concat(list1, list2, list3);