/**
 * A fair coin, which can be flipped.
 * 
 * @author Ian Barland 
 * @version 2006.Oct.17
 */
public class Coin {
  private Die d2 = new Die(2);

  private final static int TAILS = 1; /* The Die roll corresponding to tails. */
  private final static int HEADS = 2; /* The Die roll corresponding to heads. */


  /** Flip the coin.
   */
  public void flip() {
    d2.roll();
    }

  /** Is the coin currently showing tails?
   * @return true iff the face is showing tails.
   */
  public boolean isTails() {
    return (d2.getFace() == TAILS);
    }

  /** Is the coin currently showing heads?
   * @return true iff the face is showing heads.
   */
  public boolean isHeads() {
    return !(this.isTails());
    }

  public String toString() {
    return "[Coin: face=" + (this.isTails() ? "tails" : "heads") + "]";
    }


  public static void testCoin() {
    Coin c = new Coin();
    System.out.println( c.toString() );
    c.flip();
    System.out.println( c.toString() );
    c.flip();
    System.out.println( c.toString() );
    c.flip();
    System.out.println( c.toString() );
    }

  }