1st) you use ++def in a loop, don't be weird; 2nd) if 'abc' is to be used in the loop body, define in the loop, e.g. for (int def = 7, abc =3; ...); 3rd) this is an IntelliJ bug - both 'def' and 'abc' in the sample are always defined.
Of course not, I do use both. Admittedly i++ is a lot more common in Java, and for loops i++ is the standard idiom. Not using the standard idiom usually implies less practice, e.g. str.indexOf('x') < 0 is the standard one, not == -1. Even the backwards iteration is a postfix subtraction::
for (int i = array.length; i-- > 0;) doStuff(array[i]);
