Iterate an ArrayList of HashMap objects

Question

I have an ArrayList of HashMap objects as result of parsing an XML file. I would like to create an ArrayList of values for a certain key for display in a ListView. Here is what I have so far:

    // Initialize the guideList ArrayList
    ArrayList<String> guideList = new ArrayList<String>();
    HashMap<String,Object> dict = null;

    // Get the data - returns an ArrayList
    Object obj = plist.getConfigurationObject("array");

    // make sure an ArrayList was returned
    if (obj instanceof ArrayList) {

        // initialize Iterator
        Iterator itr = ((ArrayList) obj).iterator();
        int i = 0;

        // Loop through and create guideList ArrayList
        while (itr.hasNext()) {
            itr.next();
            dict = ((ArrayList<HashMap>) obj).get(i++);
            Object guideNo = dict.get("GUIDE_NO");
            guideList.add( "Guide "+guideNo.toString() );
        }
    }

This code does work, but is it the most efficient?

Are you having some trouble with it this way? Or is it working properly but you are just wondering if there is a better way to do it? — FoamyGuy, Jun 15 '12 at 00:59
Duplicate of http://stackoverflow.com/questions/1026723/how-to-convert-a-map-to-list-in-java? — Christian Garbin, Jun 15 '12 at 01:04
Thanks for the replies. This code does work, I'm concerned about performance on larger data sets. — wyoskibum, Jun 15 '12 at 10:17
This is not a duplicate of the above question which is about retrieving a list values and keys from a Map. While I'm looking for the most efficient way to iterate through an Array of Maps. — wyoskibum, Jun 15 '12 at 10:54

Iterate an ArrayList of HashMap objects

0 Answers0