How To Assort Listing Inwards Contrary Lodge Inwards Coffee Collection Framework Amongst Example

Java Collection Framework provides a convenient contrary comparator, to kind List of objects inwards contrary order.  You tin obtain contrary Comparator, past times calling Collections.reverseOrder(), which past times default kind List of Integer inwards contrary numeric club as well as List of String inwards contrary alphabetic order. It genuinely contrary natural ordering of objects imposed past times Comparable interface. Apart from this method, Collections shape equally good provides an overloaded method Collections.reverseOrder(Comparator cmp), which takes a Comparator, as well as kind List on contrary club of that Comparator. So side past times side fourth dimension if you lot withdraw to kind your Collection in contrary order, you lot don’t withdraw to write whatsoever extra comparator past times yourself, you lot tin straight leverage contrary comparator provided past times java.util.Collections class. It is equally unproblematic equally calling Collections.sort() method providing comparator wrapped into Collections.reverseOrder() method. By using these ii methods, you lot tin kind whatsoever List implementation e.g. ArrayList, LinkedList or Vector inwards Java.

Java Program to kind ArrayList inwards contrary Order

Here is consummate code for sorting List inwards contrary club inwards Java. In this programme nosotros induce got ii list, List<Integer> as well as List<String> as well as nosotros are sorting them origin inwards natural club as well as than inwards at that topographic point contrary club past times using Collections.reverseOrder() method.

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collections;

import java.util.List;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

  * Java Program to kind List of object inwards contrary order. We volition run into examples of

  * sorting Array List inwards contrary club of both default ordering equally good equally whatsoever

  * custom ordering imposed past times Compartor.

  *

  * @author Javin Paul

  */

public class CollectionSorting {

 

    private static final Logger logger = LoggerFactory.getLogger(CollectionSorting.class);

  

    public static void main(String args[]) {

      

        // Creating as well as initializing Collection to kind inwards contrary order

        // Integer volition survive sorted inwards contrary numeric order

        List<Integer> collection = new ArrayList<Integer>();

        collection.add(101);

        collection.add(201);

        collection.add(105);

        collection.add(302);

      

        logger.debug("Current club inwards Collection : " + collection);

      

        // Sorting Collection inwards contrary order

        Collections.sort(collection, Collections.reverseOrder());

      

        logger.debug("Sorted on Reverse club inwards Collection : {}", collection);

      

        // Sorting List of String inwards contrary Order

        List<String> alphabets = Arrays.asList("A", "B", "C", "D");

      

        logger.debug("Current club inwards List of String : {}", alphabets);

      

        // Sorting List inwards contrary Order

        Collections.sort(alphabets, Collections.reverseOrder());

      

        logger.debug("List of String sorted inwards contrary club {}", alphabets);

    }

 

}

Output

 [main] DEBUG CollectionSorting  - Current club inwards Collection : [101, 201, 105, 302]

 [main] DEBUG CollectionSorting  - Sorted on Reverse club inwards Collection : [302, 201, 105, 101]

[main] DEBUG CollectionSorting  - Current club inwards List of String : [A, B, C, D]

[main] DEBUG CollectionSorting  - List of String sorted inwards contrary club [D, C, B, A]

That's all on How to kind List of Strings or Integers inwards to revrese order. You tin equally good role same technique to kind whatsoever List into contrary club of at that topographic point natural ordering or custom ordering imposed past times whatsoever Comparator inwards Java.

Further Learning
Java In-Depth: Become a Complete Java Engineer
tutorial)
How to kind an ArrayList inwards ascending as well as descending club inwards Java? (tutorial)
Difference betwixt ArrayList as well as HashSet inwards Java? (answer)
The deviation betwixt TreeMap as well as TreeSet inwards Java? (answer)
The deviation betwixt HashMap as well as ConcurrentHashMap inwards Java? (answer)
The deviation betwixt HashSet as well as TreeSet inwards Java? (answer)
The deviation betwixt ArrayList as well as LinkedList inwards Java? (answer)
The deviation betwixt Vector as well as ArrayList inwards Java? (answer)

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