Nov 25, 2024 · The simplest way to reverse an array in Java is by using a loop to swap elements or by using the helper methods from the Collections and Arrays classes. Example: Let’s take an example to reverse an array using a basic loop approach.

Jan 26, 2010 · To reverse an int array, you swap items up until you reach the midpoint, like this: int temp = validData[i]; validData[i] = validData[validData.length - i - 1]; validData[validData.length - i - 1] = temp; The way you are doing it, you swap each element twice, so the result is …

May 20, 2022 · We can reverse the order of an Array in Java by following methods: 1. Reverse an Array by using a simple for loop through iteration. 2. Reverse an Array by using the in-place method. 3. Reverse an Array by using ArrayList and Collections.reverse( ) method 4. Reverse an Array by using StringBuilder.append( ) method 5.

Sep 25, 2024 · // Java Program to reverse an array using Recursion import java.util.Arrays; class GfG {// recursive function to reverse an array from l to r static void reverseArrayRec (int [] arr, int l, int r) {if (l >= r) return; // Swap the elements at the ends int temp = arr [l]; arr [l] = arr [r]; arr [r] = temp; // Recur for the remaining array ...

Nov 8, 2009 · Reverse an array of characters without creating a new array using java. int middle = array.length / 2; String temp; int j = array.length -1; for (int i = 0 ; i < middle; i++) { temp = array[i]; array[i] = array[j]; array[j] = temp; j--; System.out.println(Arrays.toString(array));

Apr 1, 2025 · Q #1) How do you Reverse an Array in Java? Answer: There are three methods to reverse an array in Java. Using a for loop to traverse the array and copy the elements in another array in reverse order. Using in-place reversal in which the elements are swapped to place them in reverse order.

Jan 8, 2024 · In this quick article, we’ll show how we can invert an array in Java. We’ll see a few different ways to do this using pure Java 8-based solutions – some of those mutate an existing array and some create a new one. Next, we’ll look at two solutions using external libraries — one using Apache Commons Lang and one using Google Guava. 2.

Apr 9, 2011 · If you want to reverse the array in-place: Collections.reverse(Arrays.asList(array)); It works since Arrays.asList returns a write-through proxy to the original array.

Feb 14, 2025 · For example, the following method returns an array that is the reversal of another array. public static int [] revers(int [] list){ int[] result = new int[list.length]; for (int i=0, j=result.length-1; i<list.length; i++, j--){ result[j]= list[i]; } return result; }

In this tutorial, we will discuss how one can reverse an array in Java. In the input, an integer array is given, and the task is to reverse the input array.