Click here to watch in Youtube :
https://www.youtube.com/watch?v=AhMA81hEEH4&list=UUhwKlOVR041tngjerWxVccw
Country.java
CountrySortByNameComparator.java
https://www.youtube.com/watch?v=AhMA81hEEH4&list=UUhwKlOVR041tngjerWxVccw
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; } }
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()); } } }
Before Sort : Country Id: 1 || Country Name: Bangladesh Country Id: 4 || Country Name: China Country Id: 3 || Country Name: Australia Country Id: 2 || Country Name: Denmark ------------------------------------------------- Compare method in CountrySortByNameComparator has been called in order to arrange the country objects in descending order based on Country Name. Compare method in CountrySortByNameComparator has been called in order to arrange the country objects in descending order based on Country Name. Compare method in CountrySortByNameComparator has been called in order to arrange the country objects in descending order based on Country Name. Compare method in CountrySortByNameComparator has been called in order to arrange the country objects in descending order based on Country Name. Compare method in CountrySortByNameComparator has been called in order to arrange the country objects in descending order based on Country Name. ------------------------------------------------- After Sort : Country Id: 2 || Country Name: Denmark Country Id: 4 || Country Name: China Country Id: 1 || Country Name: Bangladesh Country Id: 3 || Country Name: Australia
https://sites.google.com/site/javaee4321/java-collections/CollectionsSortDemoSortCountryByNameDesc.zip?attredirects=0&d=1
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