How to .indexOf on two chars?

rwpk9 :

So, I'm trying to make a calculator that respects multiplications and divisions order, I'm typing a String, for example "6+43/2-5*12" and my program should find the first division or multiplication position.

I can find the first multiplication on the String like:

int first_mult = string.indexOf('*');

And the first division the String like:

int first_div = string.indexOf('/');

That works, but I want to find the first multiplication or division at same time, I've tryed:

int first_oper = string.indexOf('*'||'/');

But that don't works. Is there any way to do it?

Andy Turner :

One way is to use an IntStream:

int first_oper = IntStream.range(0, string.length())
    .filter(i -> string.charAt(i) == '*' || string.charAt(i) == '/')
    .findFirst()
    .orElse(-1);

Or, of course, use a loop:

for (int i = 0; i < string.length(); ++i) {
  switch (string.charAt(i)) {
    case '*': case '/': return i;
  }
}
return -1;