How do I get an array of LinkedLists?

Question

I need an array of liked lists
I tryed the code:
LinkedList buckets[] = new LinkedList[radix];But that generated an unchecked warning when I tried to put an Integer into it.
I changed it to:
LinkedList<Integer> buckets[] = new LinkedList<Integer>[radix];But that generated a "generic array creation" error.
is it possible to to get an array of lists without warnings?

Answer 1

It is possible to use generic arrays (simple ones)
e.g.
import java.util.List;
public class Test
   public static void main(String[] args)
      String[] elements = new String[]{"Happy","Go","Lucky"};
      String middleElement = middleElement(elements);
      System.out.println(middleElement);
   public static <T> T middleElement(T[] elements)
      return elements[elements.length/2];
}However you cannot (should not) create generic arrays with bounded parameters.
Lets say that we have somehow create a generic array:
List<String>[] lists = ...
Then since lists is an array we can assign it to Object[]
Object[] objArray = lists;
and now we can put any list in the array.
objArray[0] = new ArrayList<Rectangle>();
Even though this should not happen, the runtime has no way to check aginst it and so no ArrayStoreException is thrown.
You are however free to:
List<?>[] lists = new List<?>[5];
which implies its an array of any type of List.