interrupt doesn't interrupt?

[Rebecca Witmer]

I have the following small method in my code. spt is a thread. Why doesn't isInterrupted() always return true? It always prints "false".
Rebecca

public void stopSegment( ) {
if (segmentPlaying){
segmentTimer.stop( );
segmentLine.stop();
segmentLine.flush();
segmentLine.close();

spt.interrupt();
boolean interrupted = spt.isInterrupted();
spt = null;
System.out.println("Spt is interrupted is " + interrupted);

segmentPlaying = false;
}
}

[David Harkness]

From the JavaDocs for Thread.interrupt():

 If this thread is blocked in an invocation of the wait(), wait(long), or wait(long, int) methods of the Object  class, or of the join(), join(long), join(long, int), sleep(long), or sleep(long, int), methods of this class, then [I]its interrupt status will be cleared[/I] and it will receive an InterruptedException.
 
[ My emphasis ]

Is that Thread currently sleeping or waiting?