How to Sort List into Ascending in addition to Descending Order inward Java

ArrayList, Set Sorting inwards Ascending – Descending Order Java

Sorting List, Set as well as ArrayList inwards Java on ascending as well as descending social club is rattling easy, You only postulate to know right API method to produce that. Collections.sort() method volition kind the collection passed to it, doesn't render anything only kind the collection itself. Sort() method of Collections shape inwards Java is overloaded where around other version takes a Comparator as well as kind all the elements of Collection on social club defined yesteryear Comparator.If we don't transcend whatever Comparator than object volition live on sorted based upon at that spot natural order similar String volition live on sorted alphabetically or lexicographically. Integer volition live on sorted numerically etc. Default sorting social club for an object is ascending social club similar Integer volition live on sorted from depression to high land descending social club is only opposite. Collections.reverseOrder() returns a Comparator which volition live on used for sorting Object inwards descending order.

Sorting List inwards ascending as well as descending social club - Example

Here amount code instance of how to kind List inwards Java on both ascending as well as descending social club inwards Java. Its non hard only holler back that Collections.sort() is a cardinal method which kind objects of Collection. You tin transcend it Comparator for defining sorting order. If no comparator passed than Object must implement Comparable interface inwards social club to live on sorted.

package example;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

/**
* Java plan Example of sorting List, ArrayList as well as Set on ascending as well as descending order

* inwards Java.
* Collections.sort() method is used for sorting collection as well as Collections.reverseOrder()
* volition kind elements of Collections inwards descending order.
* @author Javin Paul
*/
public class CollectionSortingExample{

public static void main(String args[]) throws InterruptedException{

// Sort List as well as Set inwards ascending social club

// Sorting List inwards Java inwards ascending social club inwards Java
List<Integer> listing = Arrays.asList( 1, 2, 5, 9, 3, 6, 4, 7, 8);

System.out.println("Unsorted List inwards Java: " + list);

// Sorting List into Java now, Collections.sort() method volition sort

// the collection passed
// to it. Doesn't render anything it only kind the collection itself

Collections.sort(list); //sorting collection

System.out.println("List inwards Java sorted inwards ascending order: " + list);

// sorting List inwards descending social club inwards Java, Collections.sort() method tin live on used
// to kind all chemical component subdivision inwards descending social club if nosotros transcend it comparator which tin
// render descending social club for elements. hither is an instance of sorting List
// inwards descending social club in Java
// Collection shape provides a inwards built-in comparator for that which tin
// kind objects inwards contrary social club i..e descending social club for Integers or
// whatever other Object inwards Java

Collections.sort(list, Collections.reverseOrder());
System.out.println("Java List sorted inwards descending order: " + list);

// Any List implementation inwards Java similar ArrayList, LinkedList
// tin live on sorted inwards ascending as well as descending social club inwards Java yesteryear next above
// example, let's run into a quick instance for sorting ArrayList as well as LinkedList
// inwards ascending as well as descending social club inwards Java

//Sorting ArrayList inwards ascending social club inwards Java
ArrayList alphabets = new ArrayList();
alphabets.add("c");
alphabets.add("b");
alphabets.add("a");
alphabets.add("d");

System.out.println("Unsorted ArrayList inwards Java : " + alphabets);

//Sorting ArrayList into ascending social club
Collections.sort(alphabets);

System.out.println("Sorted ArrayList inwards ascending social club inwards Java : " + alphabets);

//Sorting ArrayList into descending social club or contrary social club inwards Java
Collections.sort(alphabets, Collections.reverseOrder());

System.out.println("ArrayList kind inwards descending social club inwards Java : " + alphabets);

}

}

Output:
Unsorted List inwards Java: [1, 2, 5, 9, 3, 6, 4, 7, 8]
List inwards Java sorted inwards ascending order: [1, 2, 3, 4, 5, 6, 7, 8, 9]
Java List sorted inwards descending order: [9, 8, 7, 6, 5, 4, 3, 2, 1]
Unsorted ArrayList inwards Java : [c, b, a, d]
Sorted ArrayList inwards ascending social club inwards Java : [a, b, c, d]
ArrayList kind inwards descending social club inwards Java : [d, c, b, a]