How To Assort Listing Inwards Opposite Club Inwards Coffee Collection Framework Amongst Example

Java Collection Framework provides a convenient contrary comparator, to form List of objects inwards contrary order.  You tin forcefulness out obtain contrary Comparator, past times calling Collections.reverseOrder(), which past times default form List of Integer inwards contrary numeric social club together with List of String inwards contrary alphabetic order. It truly contrary natural ordering of objects imposed past times Comparable interface. Apart from this method, Collections flat likewise provides an overloaded method Collections.reverseOrder(Comparator cmp), which takes a Comparator, together with form List on contrary social club of that Comparator. So side past times side fourth dimension if you lot request to form your Collection in contrary order, you lot don’t request to write whatever extra comparator past times yourself, you lot tin forcefulness out direct leverage contrary comparator provided past times java.util.Collections class. It is every bit elementary every bit calling Collections.sort() method providing comparator wrapped into Collections.reverseOrder() method. By using these ii methods, you lot tin forcefulness out form whatever List implementation e.g. ArrayList, LinkedList or Vector inwards Java.

Java Program to form ArrayList inwards contrary Order

Here is consummate code for sorting List inwards contrary social club inwards Java. In this programme nosotros direct maintain ii list, List<Integer> together with List<String> together with nosotros are sorting them offset inwards natural social club together with than inwards at that spot contrary social 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 form List of object inwards contrary order. We volition come across examples of

  * sorting Array List inwards contrary social club of both default ordering every bit good every bit whatever

  * 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 together with initializing Collection to form inwards contrary order

        // Integer volition live on 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 social club inwards Collection : " + collection);

      

        // Sorting Collection inwards contrary order

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

      

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

      

        // Sorting List of String inwards contrary Order

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

      

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

      

        // Sorting List inwards contrary Order

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

      

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

    }

 

}

Output

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

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

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

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

That's all on How to form List of Strings or Integers inwards to revrese order. You tin forcefulness out likewise role same technique to form whatever List into contrary social club of at that spot natural ordering or custom ordering imposed past times whatever Comparator inwards Java.

Further Learning
Java In-Depth: Become a Complete Java Engineer
tutorial)
How to form an ArrayList inwards ascending together with descending social club inwards Java? (tutorial)
Difference betwixt ArrayList together with HashSet inwards Java? (answer)
The departure betwixt TreeMap together with TreeSet inwards Java? (answer)
The departure betwixt HashMap together with ConcurrentHashMap inwards Java? (answer)
The departure betwixt HashSet together with TreeSet inwards Java? (answer)
The departure betwixt ArrayList together with LinkedList inwards Java? (answer)
The departure betwixt Vector together with ArrayList inwards Java? (answer)

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