Java Examples - Reversing an array list

Problem Description:

How to reverse an array list ?

Solution:

Following example reverses an array list by using Collections.reverse(ArrayList)method.

import java.util.ArrayList; import java.util.Collections; public class Main { public static void main(String[] args) { ArrayList arrayList = new ArrayList(); arrayList.add("A"); arrayList.add("B"); arrayList.add("C"); arrayList.add("D"); arrayList.add("E"); System.out.println("Before Reverse Order: " + arrayList); Collections.reverse(arrayList); System.out.println("After Reverse Order: " + arrayList); } }

Result:

The above code sample will produce the following result.

Before Reverse Order: [A, B, C, D, E] After Reverse Order: [E, D, C, B, A]