Discussion
Sample16 is run - what will be the output?
public class Sample16
{
public static void main(String[] args) throws InterruptedException
{
Thread t = new Thread(() -> { throw new RuntimeException("x"); });
try
{
t.start();
t.join();
}
catch (RuntimeException e)
{
System.out.println("caught");
}
System.out.println("end");
}
}
Answer: D
The try block surrounds start() and join(), neither of which throws the worker's exception: it is delivered on the worker's own stack. So the catch never runs, the default handler prints the trace, and main continues to end. Catching a worker's failure needs an UncaughtExceptionHandler, or a Callable and a Future.
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