How to remove duplicate highs and lows

Question

I want to remove duplicates of the maximum and minimum values from a collection of integers. I can delete if there is 1 duplicate, but how can I remove when collection contains more then one?

values.stream()
           .sorted(Comparator.reverseOrder())
           .skip(1)
           .sorted()
           .skip(1)
           .collect(Collectors.toList())
           .forEach(System.out::println);
}

Answer 1

Lets consider you have List<Integer> asList = Arrays.asList(2, 2, 4, 6, 7, 8, 7, 8);

You can create 2 different streams for your solution. First you will have to find out min & max using following way:

IntSummaryStatistics stats = asList.stream().mapToInt(Integer::intValue).summaryStatistics();

This will return you min & max. Once you get both the value you can try to filter out the record and collect all the remaining.

List<Integer> collect = asList.stream()
                              .filter(x -> x > stats.getMin() && x < stats.getMax())
                              .collect(Collectors.toList());
collect.add(stats.getMin());
collect.add(stats.getMax());

You will get the required output once you sort the list: [2, 4, 6, 7, 7, 8]

Answer 2

List<Integer> numbersList = new ArrayList<>(Arrays.asList(1, 1, 2, 3, 3, 3, 4, 5, 6, 6, 6, 7, 8));
    Collections.sort(numbersList);
    int min = numbersList.get(0);
    int max = numbersList.get(numbersList.size() - 1);
    numbersList = numbersList.subList(numbersList.lastIndexOf(min), numbersList.size());
    int maxIdx = numbersList.lastIndexOf(max);
    while (maxIdx != -1) {
        numbersList.remove(maxIdx);
        maxIdx = numbersList.lastIndexOf(max);
    }
    System.out.println(numbersList);

o/p: [1, 2, 3, 3, 3, 4, 5, 6, 6, 6, 7]