Can (a==1 && a==2 && a==3) evaluate to true in Java?

Question

We know it can in JavaScript.

But is it possible to print \"Success\" message on the condition given below in Java?

if (a==1 && a==2 &&am         


        

Answer 1

Inspired by the @Erwin's excellent answer, I wrote a similar example, but using Java Stream API.

And an interesting thing is that my solution works, but in very rare cases (because  just-in-time compiler optimizes such a code).

The trick is to disable any JIT optimizations using the following VM option:

-Djava.compiler=NONE

In this situation, the number of success cases increases significantly. Here is the code:

class Race {
    private static int a;

    public static void main(String[] args) {
        IntStream.range(0, 100_000).parallel().forEach(i -> {
            a = 1;
            a = 2;
            a = 3;
            testValue();
        });
    }

    private static void testValue() {
        if (a == 1 && a == 2 && a == 3) {
            System.out.println("Success");
        }
    }
}

P.S. Parallel streams use ForkJoinPool under the hood, and variable a is shared between multiple threads without any synchronization, that's why the result is non-deterministic.