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Country.java

public class Country
{
    private int countryId;
    private String countryName;

    public Country(int countryId, String countryName)
    {
        super();
        this.countryId = countryId;
        this.countryName = countryName;
    }

    public int getCountryId()
    {
        return countryId;
    }

    public void setCountryId(int countryId)
    {
        this.countryId = countryId;
    }

    public String getCountryName()
    {
        return countryName;
    }

    public void setCountryName(String countryName)
    {
        this.countryName = countryName;
    }
    
}

CountrySortByNameComparator.java

import java.util.Comparator;

public class CountrySortByNameComparator implements Comparator<Country>
{

    /*
     * This method has logic to arrange the country objects in descending order
     * based on Country Name.
     */

    @Override
    public int compare(Country country1, Country country2)
    {

        System.out
                .println("Compare method in CountrySortByNameComparator has been called"
                        + "\nin order to arrange the country objects in descending order \nbased on Country Name.\n");

        return country2.getCountryName().compareTo(country1.getCountryName());

    }

}

import java.util.ArrayList;
import java.util.Collections;

/*
 *  Example of sort(List<T> list, Comparator<? super T> c) method
 */

public class CollectionsSortExample
{

    public static void main(String[] args)
    {
        Country india = new Country(1, "Bangladesh");
        Country china = new Country(4, "China");
        Country usa = new Country(3, "Australia");
        Country srilanka = new Country(2, "Denmark");

        ArrayList<Country> countryList = new ArrayList<Country>();
        countryList.add(india);
        countryList.add(china);
        countryList.add(usa);
        countryList.add(srilanka);

        System.out.println("Before Sort  : \n");

        for (Country country : countryList)
        {
            System.out.println("Country Id: " + country.getCountryId() + " || "
                    + "Country Name: " + country.getCountryName());
        }

        System.out.println("-------------------------------------------------");
        /*
         * Sorts the specified list according to the order induced by the
         * specified comparator.
         */
        Collections.sort(countryList, new CountrySortByNameComparator());

        System.out.println("-------------------------------------------------");
        System.out.println("\nAfter Sort  : \n");

        for (Country country : countryList)
        {
            System.out.println("Country Id: " + country.getCountryId() + " || "
                    + "Country Name: " + country.getCountryName());
        }

    }

}