Iterating in a collection (LIST or MAP)

Hi ranchers ,

I'm getting this [[shipmentId=20390, facilityId=10070, shipGroupSeqId=00001]] collection from a service , can you please tell me how to iterate throw this collection . I need to get the shipmentid .

What is that structure? A String? A List of Lists? A List of arrays? A List of Maps?

HI Rob,

Even I'm also trying to get the structure .
I think its a list in list structure ,list thought it would be a list in list with a map as element.

karimkhan pathan wrote: it would be a list in list with a map as element.

probably it is not! . Map elements always display surrounding by "{}" . so first find out what types are that by using getClass() . i think it should be *list of list of some thing* . if yes just iterate through by using 2 for loops.

Hi Seetharaman ,

your correct ,its not a map its a list in list only .

Thanks a lot ranchers ..

You are welcome

Until you find out it's going to be difficult, so you'll need to analyze first. Using getClass(), instanceof and casting you can already find out a lot. A recursive call may be quite useful:

public static void analyze(Object object, String indent)
{
    if (object == null)
    {
        System.out.println(indent + "null");
        return;
    }
    Class<?> cls = object.getClass();
    System.out.println(indent + cls.getName());
    if (object instanceof Collection)
    {
        if (object instanceof List)
        {
            System.out.println(indent + "List:");
        }
        else if (object instanceof Set)
        {
            System.out.println(indent + "Set:");
        }
        else
        {
            System.out.println(indent + "Collection:");
        }
        for (Object o: (Collection)object)
        {
            analyze(o, indent + "  ");
        }
    }
    else if (object instanceof Map)
    {
        System.out.println(indent + "Map:");
        for (Map.Entry<?,?> entry: ((Map)object).entrySet())
        {
            // analyzing of keys / values is skipped
            System.out.println(indent + "  " + entry);
        }
    }
    else if (cls.isArray())
    {
        System.out.println(indent + "Array of " + cls.getComponentType().getName() + ":");
        // use reflection
        int length = Array.getLength(object); //
        for (int i = 0; i < length; i++)
        {
            Object o = Array.get(object, i);
            analyze(o, indent + "  ");
        }
    }
    else
    {
        System.out.println(indent + cls.getName() + ": " + object);
    }
}

The indentation is there to make it easier for you to see the full structure. The initial call uses an indent of "".

Thanks Rob , It will help me .

You're welcome.