Post increment operator not incrementing in for loop

Question

I\'m doing some research about Java and find this very confusing:

for (int i = 0; i < 10; i = i++) {
  System.err.print(\"hoo... \");
}

Answer 1

You're using post-increment: i = i++;, it means something like this:

temp = i;
i = i + 1;
i = temp;

because 15.14.2 Postfix Increment Operator ++:

The value of the postfix increment expression is the value of the variable before the new value is stored.

That is why you have the old value.

For-loop done right:

for (int i = 0; i < 10; i++) {
  System.err.print("hoo... ");
}