How to sort String in Arraylist

Question

I have an ArrayList where I add customers. What i wnat to do is that i want to sort them, so they appear sorted on Console.

private static ArrayList <Kund> klista = new ArrayList<>();
Kund kundd = new Kund("a","b");
System.out.print("Namn: ");
String namn = scr.next();
System.out.print("Adress: ");  
String adress = scr.next(); 
if (!namnKontroll(namn)){
    System.out.println (namn + " " +"har lagts till \n");
    klista.add(kundd);
    Kund k = new Kund(namn, adress); 
    klista.add(k); 
}else{
    System.out.println("Kunden med det namnet finns redan i systemet!");
}

// this is how i add customers to my ArrayList. So now, how it is possible to sort those names in ArrayList. I want to sort them with Collections. thanks

google.com/search?q=java+sort+list ?

Petr Janeček
– Petr Janeček

2015-01-14 15:09:40 +00:00
Commented Jan 14, 2015 at 15:09 — Petr Janeček
– Petr Janeček, Commented Jan 14, 2015 at 15:09

Bruno Ribeiro · Accepted Answer · 2015-05-01 19:15:06Z

1

Try use Collections.sort(klista, theComparator). You will need create a Comparator, like this:

public class KundComparator implements Comparator<Kund> {

    @Override
    public int compare(Kund o1, Kund o2) {
        // write comparison logic here
        return o1.getID().compareTo(o2.getID());
    }

}

Then use the Comparator:

Collections.sort(klista, new KundComparator());

If you are using Java 8, you can do like this:

Collections.sort(klista, (Kund k1, Kund k2) -> k1.getId().compareTo(k2.getId()));

edited May 1, 2015 at 19:15

answered Jan 14, 2015 at 15:12

Bruno Ribeiro

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