/* An instance of this class represents a coin that can be tossed,
** (randomly) resulting in either HEADS or TAILS.
** It augments the capability of its predecessor class (TossableCoin1)
** by keeping track of how many times each of Heads and Tails was tossed.
*/
public class TossableCoin2 {

   // instance variables
   // ------------------

   private boolean headsShowing;  // true if HEADS, false if TAILS
   private int headsCntr;         // # times Heads was tossed
   private int tailsCntr;         // # times Tails was tossed


   /* Initializes this tossable coin to be "showing" HEADS.
   */
   public TossableCoin2() {
      headsShowing = true; 
      headsCntr = 0;  // not necessary, as zero is the default value
      tailsCntr = 0;  // "
   }

   // observers
   // ---------

   /* Reports whether this coin is showing HEADS.
   */
   public boolean isHeads() { return headsShowing; }

   /* Reports whether this coin is showing TAILS.
   */
   public boolean isTails() { return !headsShowing; }

   /* Returns the number of times this coin has been tossed,
   ** with Heads being the result.
   */
   public int headsCount() { return headsCntr; }

   /* Returns the number of times this coin has been tossed,
   ** with Tails being the result.
   */
   public int tailsCount() { return tailsCntr; }

  /* Returns the number of times this coin has been tossed.
   */
   public int tossCount() { return headsCount() + tailsCount(); }


   /* Returns a string indicating which of the two faces
   ** is "showing".
   */
   public String toString() {
      String result;
      if (isHeads()) 
         { result = "HEADS"; }
      else 
         { result = "TAILS"; }
      return result;
   }


   // mutators
   // --------

   /* Tosses this coin.
   */
   public void toss() {
      headsShowing = Math.random() < 0.5;
      if (headsShowing) 
         { headsCntr = headsCntr + 1; }
      else 
         { tailsCntr = tailsCntr + 1; }
   }

}