Discussion
Sample86 is run - what will be the output?
public class Sample86
{
static int total;
public static void main(String[] args) throws InterruptedException
{
Thread t = new Thread(() -> { for (int i = 1; i <= 4; i++) total += i; });
t.start();
t.join();
System.out.println(total);
}
}
Answer: B
Correct answer: 10
The loop adds 1 through 4, giving 10. The visibility concern the fourth option raises is real for an unsynchronised static field, but join establishes a happens-before relationship: everything the joined thread did is guaranteed visible to the thread that joins it. So main is certain to see 10, and no volatile or synchronisation is needed here.
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