Cannot create an array of LinkedLists in Java…?

private LinkedList<IntegerNode>[] myMatrix;

myMatrix = new LinkedList<IntegerNode>[numRows];

List< List<IntegerNode>> nodeLists = new LinkedList< List< IntegerNode >>();

class IntegerNodeList {
    private final List< IntegerNode > nodes;
}

myMatrix = (LinkedList<IntegerNode>[]) new LinkedList[numRows];

private Map<Integer, Map<Integer, IntegerNode>> myMatrix = new HashMap<Integer, Map<Integer, IntegerNode>>();

// access a matrix cell:
int rowIdx = 100;
int colIdx = 30;
Map<Integer, IntegerNode> row = myMatrix.get(rowIdx); // if null, create and add to matrix
IntegerNode node = row.get(colIdx); // possibly null

LinkedList<String>[] array = (LinkedList<String>[]) new LinkedList[6];
     array[0].add("Ahmed");

List<String>[] lst = new List[2];
lst[0] = new LinkedList<String>();
lst[1] = new LinkedList<String>();