Discussion
Sample02 is run - what will be the output?
public class Sample02
{
public static void main(String[] args) throws InterruptedException
{
Thread t = new Thread(() -> System.out.println("worker"));
t.start();
t.join();
System.out.println("main");
}
}
Answer: B
join() blocks the calling thread until the target has died, so the print inside the worker is guaranteed to complete before main reaches its own. This is the one reliable way to order output across threads; without the join either order would be possible.
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