Question

I want to sort a vector which contains Object of following fields

public class CategoryListing   {

     String company_id;
     String company_name;
     double distance;

     //setters and getters here 
}

I populated the vector from webservice, now I want to sort that vector by distance, means I want to show nearest one. How can I sort the vector which contains objects?

Answer 1

You can use Comparator.

Define a comparator which will sort on distance like below

public class DistanceComparator implements Comparator {
    public int compare(Object o1, Object o2) {
        return Double.valueOf(((CategoryListing) o1).distance)
                .compareTo(((CategoryListing) o2).distance);// use getters
    }
}

Sort vector using below sort method. Note As Arrays are present from 1.2 It is also present for blackberry.

public static void sort(Vector vector,Comparator comparator) {

    Object[] array = new Object[vector.size()];   
    vector.copyInto(array);   

    Arrays.sort(array,comparator);

    int i = 0;
    Enumeration enumumeration = vector.elements();
    while (enumumeration.hasMoreElements()) {
        enumumeration.nextElement();
        vector.insertElementAt(array[i++], i);
    }
}