菱形

for (int a=0; a<10; a++)
{
for (int b=8; b>=a; b--)
{
System.out.print(" ");
}
for (int c=0; c<=a; c++)
{
System.out.print("*");
}
System.out.println();
}
for (int d=0; d<10; d++)
{
for (int e=0; e<=d; e++)
{
System.out.print(" ");
}
for (int f=8; f>=d; f--)
{
System.out.print("* ");
}
System.out.println();
}