public class Nested
{
  public static void main(String args[])
  {
    for(int i = 0; i < 3; i++)
    {
      for(int j = 0; j < 2; j++)
      {
        System.out.println("i = " + i + " j = " + j);
      }
    }
  }
}
/*
Line#   i   j    Comment
========================
0       ?   ?
1       0   ?      0 < 3 true
2       0   0      0 < 2 true
3                   i = 0 j = 0
2       0   1      1 < 2 true
3                   i = 0 j = 1
2       0   2      2  < 2 false
1       1          1 < 3 true
2       1   0      0 < 2 true
3                  i = 1 j = 0
2       1   1      1  < 2 true
3                  i = 1 j  = 1
2       1   2      2 < 2 false
1       2          2 < 3 true
2       2   0      0 < 2 true
3                  i = 2 j = 0
2       2   1      1 < 2 true
3                  i = 2 j = 1
2       2   2      2 < 2 false
1       3          3 < 3 false

*/