How To Dissever Listing Inward Contrary Lodge Inward Coffee Collection Framework Alongside 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 social club too List of String inwards contrary alphabetic order. It truly contrary natural ordering of objects imposed past times Comparable interface. Apart from this method, Collections shape likewise provides an overloaded method Collections.reverseOrder(Comparator cmp), which takes a Comparator, too kind List on contrary social 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 whatever extra comparator past times yourself, you lot tin direct leverage contrary comparator provided past times java.util.Collections class. It is every bit uncomplicated every bit calling Collections.sort() method providing comparator wrapped into Collections.reverseOrder() method. By using these 2 methods, you lot tin kind whatever 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 social club inwards Java. In this programme nosotros lead maintain 2 list, List<Integer> too List<String> too nosotros are sorting them starting fourth dimension inwards natural social club too 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 kind List of object inwards contrary order. We volition encounter 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 too initializing Collection to kind inwards contrary order

        // Integer volition move 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 kind List of Strings or Integers inwards to revrese order. You tin likewise move same technique to kind 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 kind an ArrayList inwards ascending too descending social club inwards Java? (tutorial)
Difference betwixt ArrayList too HashSet inwards Java? (answer)
The divergence betwixt TreeMap too TreeSet inwards Java? (answer)
The divergence betwixt HashMap too ConcurrentHashMap inwards Java? (answer)
The divergence betwixt HashSet too TreeSet inwards Java? (answer)
The divergence betwixt ArrayList too LinkedList inwards Java? (answer)
The divergence betwixt Vector too ArrayList inwards Java? (answer)

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