Code Recipes Blog

In this post under Apache Collections, I will explain with example how to reverse a given array.

Apache Collections framework “CollectionUtils” class provide a static method named “reverseArray” which can be used to reverse an array.

Below is the main class showing its usage.

Main Class

package defaultPackage;

import org.apache.commons.collections4.CollectionUtils;

import java.util.Arrays;

public class Example16 {
    public static void main(String[] args) {
        Integer[] intArray = new Integer[] {1, 2, 3, 4, 5};
        CollectionUtils.reverseArray(intArray);
        String result = Arrays.toString(intArray);
        System.out.println(result);
    }
}

In the above code, at line 9, I create an integer array and populate it.

At line 10, I call static method “reverseArray” of “CollectionUtils” class and pass the integer array as argument.

At line 12, I print the elements of the array.

In this way we can reverse the array.