How to sort an ArrayList with object using stream().sorted()

Question

I am having real trouble with using stream and sorted to sort my ArrayList and hope someone can help out. The code uses Croatian words, but I don\'t think that will be a pro

Answer 1

Below code is used for to sort the your Publikacija object type Arraylist on behalf of "getCijena"

' Collections.sort(data, new Comparator<Publikacija>() {
            public int compare(Publ`enter code here`ikacija s1, Publikacija s2) {

                return s1.getCijena.compareTo(s2.getCijena);
            }
        });'

Answer 2

You can also do it in that way:

listaPublikacija.stream().sorted(Comparator.comparingDouble(Publikacija::getCijena));

Answer 3

Publikacija[] sortedArray = listaPublikacija.stream()
   .sorted(Comparators.comparing(Publikacija::getCijena, Double::compareTo)
   .toArray();

First method reference extracts the identifying key, second provides the compare function.

Answer 4

    Object[] sortirano = listaPublikacija.stream().sorted((s1, s2) -> Double.compare(s1.getCijena(), s2.getCijena())).toArray();

this worked, ty for the answer

Answer 5

You are not storing the results of the sorted array back to collection or array. Stream operations do not mutate the underlying collection:

    List<String> names = Arrays.asList("Katka", "Martin", "John");

    Object[] sortedNames = names.stream().sorted(String::compareTo).toArray();

    System.out.println("array: " + Arrays.toString(sortedNames));