Sorting using Lamda in java 8

Sorting of Strings using different sort implementations

public class Sorting {

     public static void main(String[] args) {

     List<String> = Arrays.asList("2018AF090","2013PK200","2014US100","2016IN150","2009CH090");

System.out.println("List before sorting"+ list);

          

           // Sorting list by CountryName using Comparator

           /*Collections.sort(list, new SortByCountryName());

           System.out.println("List after sorting using Comparator"+list);*/

          

           // Sorting list by CountryName using Lamda

           Collections.sort(list,(o1,o2)->{

                String cN1=o1.substring(4, 6);

                String cN2=o2.substring(4, 6);

                return cN1.compareTo(cN2);

           });

     System.out.println("Sorting list by CountryName using Lamda" +  list );

     }

}

class SortByCountryName implements Comparator<String>{

     @Override

     public int compare(String o1, String o2) {

           String cN1=o1.substring(4, 6);

           String cN2=o2.substring(4, 6);

           return cN1.compareTo(cN2);

     }

}

Ouput:

List before Sorting[2018AF090, 2013PK200, 2014US100, 2016IN150, 2009CH090]

Sorting list by CountryName using Lamda[2018AF090, 2009CH090, 2016IN150, 2013PK200, 2014US100]