Sort A Java ArrayList by a propriety

Question

I have this Object :

    public class AdresseReponse {

    private String     nom;
    private String     numero;
    private String     rue;
    private String     codePostal;
    private String     ville;
    private String     region;
    private String     pays;
    private Coordonnee coordonnees;
    private double     distanceFromThePrevious;
    private int        number;

// + all setters & getters
}

In a other class, I have an ArrayList :

ArrayList<AdresseReponse> etapes    = new ArrayList<AdresseReponse>();

and this methode :

public void testSort( AdresseReponse depart, AdresseReponse etape ) throws IOException, _Exception {...}

In this method, I do :

etapes.add(etape);

After, I need to sort etapes by distanceFromThePrevious.

How can I do this ?

Is this in C#? In that case I would suggest you to use IEnumerable List — Nagashree Hs, Aug 25 '16 at 13:56
http://stackoverflow.com/questions/4066538/sort-an-arraylist-based-on-an-object-field — Michelle Rodrigues, Aug 25 '16 at 14:07

score 1 · Accepted Answer · answered Aug 25 '16 at 14:03

You can implement this using java comparator.

After this

etapes.add(etape);

add

Sorter sorter = new Sorter();
Collections.sort(etapes, sorter);

Here sorter is the custom comparator that must be implemented. And Sorter class (of which sorter is an instance) code goes something like this

class Sorter implements Comparator<AddressResponse>{
@Override
public int compare(AddressResponse a, AddressResponse b){
    if(a.getdistanceFromThePrevious() >= b.getdistanceFromThePrevious())
        return 1;
    else if(a.getdistanceFromThePrevious() < b.getdistanceFromThePrevious())
        return -1;
}

Hope this helps.

Sort A Java ArrayList by a propriety

1 Answers1