Discussion
Sample45 is run - what will be the output?
public class Sample45
{
public static void main(String[] args) throws InterruptedException
{
final Object gate = new Object();
Thread waiter = new Thread(() ->
{
synchronized (gate)
{
try { gate.wait(); }
catch (InterruptedException e) { System.out.println("interrupted"); }
}
});
waiter.start();
Thread.sleep(100);
waiter.interrupt();
waiter.join();
}
}
Answer: A
wait is one of the documented blocking calls that respond to an interrupt by throwing InterruptedException, so the waiter leaves the wait set, re-acquires the monitor and runs its catch block. Interruption is therefore the way out of a wait that will never be notified.
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