import java.util.HashSet;
import java.util.Set;

/**
   A program that prints hash codes of coins.
*/
public class CoinHashCodePrinter
{
   public static void main(String[] args)
   {
      Coin coin1 = new Coin(0.25, "quarter");
      Coin coin2 = new Coin(0.25, "quarter");
      Coin coin3 = new Coin(0.05, "nickel");

      System.out.println("hash code of coin1=" 
            + coin1.hashCode());
      System.out.println("hash code of coin2=" 
            + coin2.hashCode());
      System.out.println("hash code of coin3=" 
            + coin3.hashCode());

      Set<Coin> coins = new HashSet<Coin>();
      coins.add(coin1);
      coins.add(coin2);
      coins.add(coin3);

      for (Coin c : coins)
         System.out.println(c);
   }
}