import java.io.*;

/** An example of creating a background process for an
 *  originally nonthreaded, class method. Normally,
 *  the program flow will wait until computeKey is finished.
 *
 *  Taken from Core Web Programming from 
 *  Prentice Hall and Sun Microsystems Press,
 *  http://www.corewebprogramming.com/.
 *  © 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted. 
 */
 
public class ThreadedRSAKey extends RSAKey implements Runnable {

  // Store strNumDigits into the thread to prevent race
  // conditions.
  public void computeKey(String strNumDigits) {
    RSAThread t = new RSAThread(this, strNumDigits);
    t.start();
  }

  // Retrieve the stored strNumDigits and call the original
  // method.  Processing is now done in the background.
  public void run() {
    RSAThread t = (RSAThread)Thread.currentThread();
    String strNumDigits = t.getStrDigits();
    super.computeKey(strNumDigits);
  }

  public static void main(String[] args){
    ThreadedRSAKey key = new ThreadedRSAKey();
    for (int i=0; i<args.length ; i++) {
        key.computeKey(args[i]);
    }
  }
}

class RSAThread extends Thread {
   protected String strNumDigits;
   
   public RSAThread(Runnable rsaObject, String strNumDigits) {
      super(rsaObject);
      this.strNumDigits = strNumDigits;
   }

   public String getStrDigits() {  
     return(strNumDigits); 
   }
}