    01: /**
    02:    A country with a name and area.
    03: */
    04: public class Country implements Comparable<Country>
    05: {
    06:    /**
    07:       Constructs a country.
    08:       @param aName the name of the country
    09:       @param anArea the area of the country
    10:    */
    11:    public Country(String aName, double anArea)
    12:    {
    13:       name = aName;
    14:       area = anArea;
    15:    }
    16:
    17:    /**
    18:       Gets the name of the country.
    19:       @return the name
    20:    */
    21:    public String getName()
    22:    {
    23:       return name;
    24:    }
    25:
    26:    /**
    27:       Gets the area of the country.
    28:       @return the area
    29:    */
    30:    public double getArea()
    31:    {
    32:       return area;
    33:    }
    34:
    35:
    36:    /**
    37:       Compares two countries by area.
    38:       @param other the other country
    39:       @return a negative number if this country has a smaller
    40:       area than otherCountry, 0 if the areas are the same,
    41:       a positive number otherwise
    42:    */
    43:    public int compareTo(Country other)
    44:    {
    45:       if (area < other.area) return -1;
    46:       if (area > other.area) return 1;
    47:       return 0;
    48:    }
    49:
    50:    private String name;
    51:    private double area;
    52: }