Answer 1

it's not just about loop if there is just the increment operator with a variable and is not relative then it won't make changes whther it's postfix or prefix..
like for example 1:
int x=2;
x++;
int y=x; // y will be 3

now take the same example2:
int x=2;
++x;
int y=x; //y will be 3;

now take another example 3:
int x=2;
int y=++x; // y will be 3 and x also will be 3

now take same example 4:
int x=2;
int y=x++; //y will be 2 and x will be 2 but the x will change to 3 after statement terminates..
System.out.println(y);
System.out.println(x);
now in example 1 and 2 the value of x++ and ++x are not related to any other variable..
but in the example 3 and 4 the value of x is related to y directly, the increment affects the value of y there itself