Source Code : Thread Interrupt when calculating Pi

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Thread Interrupt when calculating Pi

 
public class PiInterrupt extends Object implements Runnable {
  private double latestPiEstimate;

  public void run() {
    try {
      System.out.println("for comparison, Math.PI=" + Math.PI);
      calcPi(0.000000001);
      System.out
          .println("within accuracy, latest pi=" + latestPiEstimate);
    } catch (InterruptedException x) {
      System.out.println("INTERRUPTED!! latest pi=" + latestPiEstimate);
    }
  }

  private void calcPi(double accuracy) throws InterruptedException {

    latestPiEstimate = 0.0;
    long iteration = 0;
    int sign = -1;

    while (Math.abs(latestPiEstimate - Math.PI) > accuracy) {

      if (Thread.interrupted()) {
        throw new InterruptedException();
      }

      iteration++;
      sign = -sign;
      latestPiEstimate += sign * 4.0 / ((2 * iteration) - 1);
    }
  }

  public static void main(String[] args) {
    PiInterrupt pi = new PiInterrupt();
    Thread t = new Thread(pi);
    t.start();

    try {
      Thread.sleep(10000);
      t.interrupt();
    } catch (InterruptedException x) {
    }
  }
}

           
         
  

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