Java Program to Reverse ArrayList in Java

Java arraylist reverse – Java Program to Reverse ArrayList in Java

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Java arraylist reverse: In the previous article, we have seen Java Program to Compare Two ArrayList in Java

In this article we are going to see how we can reverse ArrayList in Java.

Java Program to Reverse ArrayList in Java

How to reverse arraylist in java: Before jumping to the program directly, first let’s know how we can reverse an arraylist.

In Java Collection class we have inbuilt reverse() method can be used to reverse any collection directly.

Syntax: Collections.reverse(arrayList_Name)

Where,

  • arrayList_Name refers to the ArrayList.

Let’s see the program to understand it more clearly.

Java Program to Reverse ArrayList in Java By Using Collections.reverse( ) Method

Approach:

  • Create an arraylist and add some elements to it
  • Display the elements.
  • Use the reverse() method of collection method and pass the arraylist into it.
  • Display the modified list.

Program:

import java.util.*;

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");
        // Displaying the list
        System.out.println("Arraylist 1 before reversing "+arr);
        
        //Reversing ArrayList using the reverse()
        Collections.reverse(arr);
        // Printing the modified arraylist
        System.out.println("After Reversal "+arr);
    

    }
}


Output:

Arraylist 1 before reversing [One, Two, Three]
After Reversal [Three, Two, One]

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