Omitting the change

Syntactically you can omit the change part. This means that if the Java compiler sees:

for ( count = 0; count < 25;  )

it will not complain. It is now your responsibility to put statements that make a change somewhere into the loop body. For example:

for ( count = 0; count < 25;  )
{
  System.out.println("count is: " + count );
  count = count + 1;
}

would work fine. (Although in this case it would be far better to do the change in the for.)