How To Reverse A List In Java

Chapter: Miscellaneous Last Updated: 17-05-2023 15:04:05 UTC

Program:

            /* ............... START ............... */
                import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class ReverseListExample {
    public static void main(String[] args) {
        // Create a list
        List<Integer> numbers = new ArrayList<>();
        numbers.add(1);
        numbers.add(2);
        numbers.add(3);
        numbers.add(4);
        numbers.add(5);

        // Print the original list
        System.out.println("Original list: " + numbers);

        // Reverse the list
        Collections.reverse(numbers);

        // Print the reversed list
        System.out.println("Reversed list: " + numbers);
    }
}

                /* ............... END ............... */
        

Output

Original list: [1, 2, 3, 4, 5]
Reversed list: [5, 4, 3, 2, 1]

Notes:

  • First, we create an ArrayList called numbers and add some integer values to it. In this example, we added the numbers 1, 2, 3, 4, and 5 to the list.
  • Then, we print the original list using System.out.println(), which displays the list as [1, 2, 3, 4, 5].
  • Next, we use the Collections.reverse() method to reverse the order of elements in the numbers list. This method modifies the original list in-place, meaning it doesn't create a new reversed list but changes the existing list itself.
  • After reversing the list, we print the reversed list using System.out.println(). The reversed list is displayed as [5, 4, 3, 2, 1].
  • So, the program demonstrates how to use the Collections.reverse() method to reverse the order of elements in a list in Java.
Similar Programs Chapter Last Updated
Find Unique Elements In List Java Miscellaneous 07-10-2023
Java Program To Implement A Custom equals() and hashcode() In Java Miscellaneous 07-10-2023
Java Program To Find The Intersection Of Two HashSets Miscellaneous 07-10-2023
Java Program To Remove Duplicate Elements From List Miscellaneous 07-10-2023
Java program to parse a date and time string from a log file and store it in a database Miscellaneous 19-09-2023
Java Program To Print All The Dates In A Month That Fall On A Weekend Miscellaneous 19-09-2023
Java Program To Find Number Of Working Days In A Month Miscellaneous 19-09-2023
Java Program To Calculate Age From Year Of Birth Miscellaneous 16-09-2023
How To Check If Two Strings Are Anagrams In Java Miscellaneous 22-08-2023
Java Program To Make A Snake Game Miscellaneous 15-08-2023
Java Program To Find Repeated Characters Of String Miscellaneous 15-08-2023
String To Array In Java Miscellaneous 11-08-2023
Java Program To Convert Date To String Miscellaneous 11-08-2023
Java Program To Convert String To Date Object Miscellaneous 11-08-2023
Java Program To Find Number Of Days In A Month Miscellaneous 11-08-2023
Java Program To Print First And Last Day Of Month Miscellaneous 11-08-2023
Java Program To Find Leap Year Between Two Dates Miscellaneous 11-08-2023
Java Code To Find Difference Between Two Dates In Years Months And Days Miscellaneous 11-08-2023
Java program to calculate age from year of birth Miscellaneous 29-06-2023
Swap Two Numbers Without Using Third Variable In Java Miscellaneous 02-06-2023
Java Program To Find The Average Of An Array Of Numbers Miscellaneous 02-06-2023
How Do You Find The Factorial Of A Number In Java Miscellaneous 02-06-2023
Java Program That Takes Two Numbers As Input And Prints Their Sum Miscellaneous 27-05-2023
How To Get The Length Of An Array In Java Miscellaneous 27-05-2023
Java Add Element To List Example Miscellaneous 19-05-2023
Java Program To Square All Items In List Miscellaneous 17-05-2023
Java Program To Merge Two Lists Miscellaneous 17-05-2023
Java Program To Find Unique Elements In An Array Miscellaneous 14-05-2023
Java Program To List All Elements In List Miscellaneous 30-04-2023
Java Program To Create XML File Miscellaneous 23-04-2023

1 2