Java programming help needed, need help with graphic box and its movement?

[ImMoRtaL]

g.setColor (Color.red);
g.drawRect (10, 20, 100, 15);
g.setColor (Color.pink);
g.fillRect (240, 160, 40, 110);

thats the rectangle made...in java

and i have a grid made with numbers from 1-50..
setLayout (new GridLayout (5, 5));
int m = 51;
for (int i = 0 ; i < 5 ; i++)
{
for (int j = 0 ; j < 10 ; j++)
{
m--;
add (new Label ("" + m));

and my problem is that i want to move the rectangle i made on the number...i can add and subtract myself...but the box just goes anywher, can anyone help me how to make array, with value of i and j...so it can be something like array [i][j] and then i can move the box with it...like box.position=array[i][j]...so i can add and subtract from array, and and move box on the number..
thanks a lot anyone who helps..
i need it badly