public static int minimumAbsoluteDifference(List<Integer> arr) {
    int minimumAbsoluteDifference = Integer.MAX_VALUE;
    arr.sort(Comparator.naturalOrder());
    for (int i = 0; i < arr.size() -1; i++) {
        int absoluteDifference = Math.abs(arr.get(i) - arr.get(i + 1));
        if(absoluteDifference < minimumAbsoluteDifference){
            minimumAbsoluteDifference = absoluteDifference;
        }
    }
    return minimumAbsoluteDifference;
    }