Java Program to Sort ArrayList in Descending Order

Java Program to Sort ArrayList in Reverse Order

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In the previous article, we have seen Java Program to Make the ArrayList Read Only

In this article we are going to see how we can sort an ArrayList in descending order in Java programming language.

Java Program to Sort ArrayList in Reverse Order

To sort the arraylist we will be using the sort library function from the Collections class.

Approach:

  • Create an arraylist
  • Add some elements to the list
  • Display the arraylist
  • Pass the arraylist into the sort( ) function as  Collections.reverseOrder() parameter to sort in descending order.
  • Print the new arraylist

Program:

import java.util.*;
import java.util.stream.Collectors;
public class Main 
{
    public static void main(String[] args)
    {
        // Creating an empty ArrayList
        ArrayList<String> arr = new ArrayList<String>();
        // Adding elements to the arrayList
        arr.add("One");
        arr.add("Two");
        arr.add("Three");
        arr.add("A1");
        arr.add("B2");
        arr.add("C3");
        // Displaying the list
        System.out.println("Original Arraylist"+arr);
        // using the sort function from collection with reverse parameter
        Collections.sort(arr,Collections.reverseOrder());
        // Printing the modified arraylist
        System.out.println("After sorting in decreasing order "+arr);
    }
}


Output:

Original Arraylist[One, Two, Three, A1, B2, C3]
After sorting in decreasing order [Two, Three, One, C3, B2, A1]

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