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Java Examples - Reversing an array list


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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]


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