Use the following files:

Coin.java

/**
   A coin with a monetary value.
*/
public class Coin implements Measurable
{ 
   private double value;
   private String name;

   /**
      Constructs a coin.
      @param aValue the monetary value of the coin.
      @param aName the name of the coin
   */
   public Coin(double aValue, String aName) 
   { 
      value = aValue; 
      name = aName;
   }

   /**
      Gets the coin value.
      @return the value
   */
   public double getValue() 
   {
      return value;
   }

   public double getMeasure()
   {
      return value;
   }

   /**
      Gets the coin name.
      @return the name
   */
   public String getName() 
   {
      return name;
   }
   
   /**
      Returns a string representation of the object.
      @return name and value of coin
   */
   public String toString()
   {
      return "Coin[value=" + value + ",name=" + name + "]";
   }
}

Measurable.java

/**
   Describes any class whose objects can be measured.
*/
public interface Measurable
{
   /**
      Computes the measure of the object.
      @return the measure
   */
   double getMeasure();
}

MinMaxTester.java

public class MinMaxTester
{
   public static void main(String[] args)
   {
      Coin[] coins = 
      {
         new Coin(0.1, "Dime"),
         new Coin(0.05, "Nickel"),
         new Coin(0.01, "Penny"),
         new Coin(0.25, "Quarter")
      };

      Pair<Coin, Coin> mm = PairUtil.minmax(coins);
      System.out.println(mm.getFirst());
      System.out.println("Expected: Coin[value=0.01,name=Penny]");
      System.out.println(mm.getSecond());
      System.out.println("Expected: Coin[value=0.25,name=Quarter]");
   }
}

Pair.java

public class Pair<T, S>
{
   private T first;
   private S second;

   public Pair(T firstElement, S secondElement)
   {
      first = firstElement;
      second = secondElement;
   }

   public T getFirst()
   {
      return first;
   }
   
   public S getSecond()
   {
      return second;
   }
}