class A
{
public static void main(String args[])
{
int Xstart = 0, Xend = 0;
for(int i = 1; i < 10; i++)
{
Xstart = Math.abs( 5 - i ) + 1;
Xend = 9 - ( Xstart - 1 );

for(int j = 1; j < 10; j++)
{
if( j < Xstart || j > Xend )
System.out.print("O");
else
{
for(int k = 1; k <= Xend - Xstart + 1; k++)
{
if( k % 2 != 0 )
System.out.print("X");
else
System.out.print("O");
}
j = Xend;
}
}
System.out.println("");
}
}
}

執行結果:
OOOOXOOOO
OOOXOXOOO
OOXOXOXOO
OXOXOXOXO
XOXOXOXOX
OXOXOXOXO
OOXOXOXOO
OOOXOXOOO
OOOOXOOOO

不知這是不是你要的?