ArrayList containing array of objects

[Gaurav Chikara]

I have an arraylist whose each element is a fixed size array of object

Wwe dont have any API to retrive array of object from ArrayList
and therefore I was wondering who can we retrieve each element as an array
from arraylist

If any one has any idea please help

[Paul Clapham]

This is hardly an advanced topic. Just cast from Object to Thing[], or whatever it's an array of:

Thing[] array = (Thing[]) yourArrayList.get(0);

[Garrett Rowe]

We dont have any API to retrive array of object from ArrayList

We can however retrieve an Object from an ArrayList, and if that Object is an array, we can cast it to an array and use it.

package tests;
 
import java.util.ArrayList;
import java.util.List;
 
public class ListOfArrays
{
   public static void main(String[] args)
   {
      List list = new ArrayList();
      list.add(new String[]{"This", "is"});
      list.add(new String[]{"a", "test."});
      
      for (int i = 0; i < list.size(); i++)
      {
         String[] element = (String[]) list.get(i);
         
         boolean space = false;
         for (int j = 0; j < element.length; j++)
         {
            if (space)
            {
               System.out.print(" ");
            }
            
            System.out.print(element[j]);
            space = true;
         }
         System.out.print("\n");
      }
    }
 
}

[Campbell Ritchie]

If you are using the latest versions of Java (5+) you shouldn't be messing abouit with casts in the first place. Take all the casting out, and declare your List as generic.

      List list = new ArrayList();    

becomes

      List<String[]> list = new ArrayList<String[]>();    

Try it and see.