JAVA: Linked list problem

I have a node class say:

************************************************

private static class Node {

private int data;

private Node right;

private Node down;

public Node(Node down, int data, Node right) {

this.down = down;

this.data = data;

this.right = right;

}

}

****************************************************************

I need to make a grid class whose constructor needs to links the rows and columns of the Nodes of for example a 5x4 grid.

so

public class Grid{

private Node head;

public Grid(){

//at (0,0), it would connect to all the nodes below it and all the nodes to the right of it. and so on and so on

//I'd also note it should be a circularly linked list.

}

}

anyhelp settting up that constructor would be appreciated. Lmk if you need more info