java - Is it ok to use increment operators with any primitive type? -

we know int++ increase variable value 1, say:

int number = 0; int temp = number + 1; number = temp;

this allowed other primitive types too:

double number = 0d; number++;

so, wondering if code above executed as:

double number = 0d; double temp = number + 1d; number = temp;

or:

double number = 0d; int temp = number + 1; number = temp;

in second case, should prefer double += 1d instead?

the ++ (prefix or postfix) not works on int , if use other primitive types, not mean there intermediate conversion int , back.

see java language specification:

as jls says, binary numeric promotion applied variable , value 1. in case of number++ number double, means 1 treated double.

so, number++ works same number += 1d if number double. not necessary number += 1d explicitly.

note: if there intermediate conversion int , back, suggest in question, expect that:

double number = 0.5; number++;

would result in number being 1.0 instead of 1.5, because conversion throw decimals away. but, can see, not case.

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