20. Thread interruption - manual checks

• Interrupts are very effective way to cancel tasks

• If the interrupted method is not calling a blocking method like like sleep() or wait(), then

  • interrupt() will not automatically interrupt the thread

  • To manually check for the interrupted flag, the thread should call isInterrupted():

  
      try {
          while ( true ) {
              // do some work...
              if ( Thread.interrupted() ) {
                  throw new InterruptedException();
              }
          }
      } catch ( InterruptedException iex ) {
          // We've been interrupted:
          Thread.currentThread().interrupt();
          return;
      }