/**
   A country with a name and area.
*/
public class Country implements Comparable
{
   /**
      Constructs a country.
      @param aName the name of the country
      @param anArea the area of the country
   */
   public Country(String aName, double anArea)
   {
      name = aName;
      area = anArea;
   }

   /**
      Gets the name of the country.
      @return the name
   */
   public String getName()
   {
      return name;
   }

   /**
      Gets the area of the country.
      @return the area
   */
   public double getArea()
   {
      return area;
   }


   /**
      Compares two countries by area.
      @param otherObject the other country
      @return a negative number if this country has a smaller
      area than otherCountry, 0 if the areas are the same, 
      a positive number otherwise
   */
   public int compareTo(Object otherObject)
   {
      Country other = (Country) otherObject;
      if (area < other.area) return -1;
      if (area > other.area) return 1;
      return 0;
   }

   private String name;
   private double area;
}

Results