public class BiasedCoinTester1 {

   public static void main(String[] args) {
      Coin c;
      c = new Coin();        // simulate coin tosses using
      doSomeTosses(c, 20);   // an instance of Coin

      c = new BiasedCoin(0.1);  // simulate coin tosses using
      doSomeTosses(c, 20);      // an instance of BiasedCoin
   }

   /* Tosses the given "coin" the specified # of times; afterwards
   ** reports how many of those tosses resulted in HEADS and how
   ** many resulted in TAILS.
   */
   private static void doSomeTosses(Coin coin, int numTosses) {
      int headCount = 0;
      // Toss the provided coin the specified # of times.
      for (int i=0; i != numTosses; i++) {
         coin.toss();
         if (coin.isHeads()) { headCount++; } 
      }
      // Report how many HEADS and TAILS occurred.
      System.out.printf("# Heads: %d; # Tails: %d\n", 
                        headCount, numTosses - headCount);
   }
}