Do you think that the change part of a for can be omitted (as long as it is done somewhere else)?

Yes.

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 better to have the change done in the for.)

Can a for statement be used to implement a sentinel controlled loop?