I.

 int i = 1;
 int a = 1;
 int b = 1;
 while( i < 100 ) 
 {
   System.out.println(a);
   int old_a = a;
   a = a + b;
   b = old_a;

 }

II.

int sum = 0;
for(int i = 1; i <= 100; i++)
{
   i = sum;
   sum = sum + i;
}

III.

for(int n = 10; n > 0; n++) 
{
   System.out.println(n);
}
System.out.println("Blast off!");