» Java Program for Sort ArrayList in Reverse Order Java Example

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 sort List of object in reverse order. We will see examples of
  * sorting Array List in reverse order of both default ordering as well as any
  * custom ordering imposed by Compartor.
  *
  * @author Javin Paul
  */
public class CollectionSorting {

    private static final Logger logger = LoggerFactory.getLogger(CollectionSorting.class);
 
    public static void main(String args[]) {
     
        // Creating and initializing Collection to sort in reverse order
        // Integer will be sorted in reverse numeric order
        List<Integer> collection = new ArrayList<Integer>();
        collection.add(101);
        collection.add(201);
        collection.add(105);
        collection.add(302);
     
        logger.debug("Current order in Collection : " + collection);
     

        // Sorting Collection in reverse order
        Collections.sort(collection, Collections.reverseOrder());
     
        logger.debug("Sorted on Reverse order in Collection : {}", collection);
     
        // Sorting List of String in reverse Order
        List<String> alphabets = Arrays.asList("A", "B", "C", "D");
     
        logger.debug("Current order in List of String : {}", alphabets);
     
        // Sorting List in reverse Order
        Collections.sort(alphabets, Collections.reverseOrder());
     
        logger.debug("List of String sorted in reverse order {}", alphabets);
    }

}

Output
 [main] DEBUG CollectionSorting  - Current order in Collection : [101, 201, 105, 302]
 [main] DEBUG CollectionSorting  - Sorted on Reverse order in Collection : [302, 201, 105, 101]

[main] DEBUG CollectionSorting  - Current order in List of String : [A, B, C, D]
[main] DEBUG CollectionSorting  - List of String sorted in reverse order [D, C, B, A]