package com.tvidushi.java8.sorted;


import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;

public class SortingMadeEasy {

	public static  List<Integer> numbers = Arrays.asList(11, 23, 13, 67,46, 51, 36, 71, 81, 19, 101);
	public static  List<String> names = Arrays.asList("Ravish", "Vidushi", "Russel", "Peter","Vir", "Das","Ashi");

	public static void main(String[] args) {
		 natrualOrder_num();
		 natrualOrder_str();
		 sortInReverseOrder();
		 sortAsc();
		 sortDesc() ;
	}


     public static void natrualOrder_num() {

			       Optional.ofNullable(numbers).ifPresent(list -> list.sort(Comparator.naturalOrder()));
			       System.out.println(numbers);
      }

     public static void natrualOrder_str() {
    	    names.sort(Comparator.naturalOrder());
	       //Optional.ofNullable(names).ifPresent(list -> list.sort(Comparator.naturalOrder()));
	       System.out.println(names);
      }

	  public static void sortInReverseOrder() {
		        List<String> names = Arrays.asList("peter", "anna", "mike", "xenia");
		        names.sort(Collections.reverseOrder());
		        System.out.println(names);
	  }

	    // lambda ways
	    public static void sortELement_3() {
	           System.out.println("Sorting  a string array in reverse order");
		        List<String> names = Arrays.asList("peter", "banna", "mike", "xenia");
		        Collections.sort(names, (String a, String b) -> {
		            return b.compareTo(a);
		        });
		        System.out.println(names);

	    }



	   public static void sortAsc() {
			    System.out.println("Sorting  a string array in natural order");
		        List<String> names2 = Arrays.asList("peter", null, "anna", "mike", "xenia");
		        names2.sort(Comparator.nullsLast(String::compareTo));
		        System.out.println("  _____"+names2);

	     }

	    // normal way
	    public static void sortDesc() {
		    System.out.println("Sorting  a string array in reverse order");
	    	   List<String> names = Arrays.asList("peter", "anna", "mike", "xenia");

		        Collections.sort(names, new Comparator<String>() {
		            @Override
		            public int compare(String a, String b) {
		                return b.compareTo(a);   // This  desending order of sorting
		            }
		        });
		        System.out.println(names);
	    }

}