Discussion
Sample18 is run - what will be the output?
public class Sample18
{
public static void main(String[] args)
{
new Thread(() -> System.out.println("A")).start();
new Thread(() -> System.out.println("B")).start();
}
}
Answer: B
Starting a thread only makes it eligible to run; the scheduler decides when, so neither ordering is promised and the answer is genuinely both. main returning does not stop them, because both are non-daemon threads and the JVM waits for them. Ordering requires join, a lock or a queue.
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