int i  -----
       | a |
       -----

int[] i = new int[5]

     ----- ----- ----- ----- -----
     | a | | b | | c | | d | | e |
     ----- ----- ----- ----- -----

int[][] i = new int[5][5]

     ----- ----- ----- ----- -----
     |a1 | |b1 | |c1 | |d1 | |e1 |
     ----- ----- ----- ----- -----
     ----- ----- ----- ----- -----
     |a2 | |b2 | |c2 | |d2 | |e2 |
     ----- ----- ----- ----- -----
     ----- ----- ----- ----- -----
     |a3 | |b3 | |c3 | |d3 | |e3 |
     ----- ----- ----- ----- -----
     ----- ----- ----- ----- -----
     |a4 | |b4 | |c4 | |d4 | |e4 |
     ----- ----- ----- ----- -----
     ----- ----- ----- ----- -----
     |a5 | |b5 | |c5 | |d5 | |e5 |
     ----- ----- ----- ----- -----