LogicalAssignment

When an assignment expression is used as the condition of a loop, it isn't clear to the reader whether the assignment was deliberate or it was intended to be an equality test. Parenthesis should be used around assignments in loop conditions to make it clear to the reader that the assignment is deliberate.

That is, instead of this:

void f(boolean x) {
  while (x = checkSomething()) {
    // ...
  }
}

Prefer while ((x = checkSomething())) { or while (x == checkSomething()) {.