Discussion
Sample23 is run - what will be the output?
public class Sample23 extends Thread
{
public void run()
{
System.out.print("swept ");
}
public static void main(String[] args) throws InterruptedException
{
Sample23 sweeper = new Sample23();
sweeper.setDaemon(true);
sweeper.start();
sweeper.join();
System.out.print("exit");
}
}
Answer: C
Being a daemon changes only what happens at shutdown; it does not stop the thread running or make join unreliable. The join holds main until the worker has died, so the order here is fully determined. The earlier version without a join is the unpredictable one.
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