Reverse an Array

This snippet demonstrates how to reverse an array efficiently using the two-pointer technique. It swaps elements from both ends of the array until the pointers meet in the middle. This approach is memory-efficient because it performs the reversal in place without requiring an additional array.

Featured

6

Related Concepts

Published

19 Jul 2026

Last Updated

Not Updated

Java Implementation

Complete Java Solution

Production-ready Java implementation for quick revision, interview preparation, and real-world development.

29Lines

21Code Lines

580Characters

arraysCategory

Time: O(n) | Space: O(1)Complexity

Solution.java

Java

1public class ReverseArray {
2 
3    public static void reverse(int[] arr) {
4        int left = 0;
5        int right = arr.length - 1;
6 
7        while (left < right) {
8            int temp = arr[left];
9            arr[left] = arr[right];
10            arr[right] = temp;
11 
12            left++;
13            right--;
14        }
15    }
16 
17    public static void main(String[] args) {
18 
19        int[] numbers = {1, 2, 3, 4, 5, 6};
20 
21        reverse(numbers);
22 
23        System.out.print("Reversed Array: ");
24 
25        for (int num : numbers) {
26            System.out.print(num + " ");
27        }
28    }
29}

29 lines580 chars

Keywords

Related Java Snippets

Discover more snippets from the same category to strengthen your Java fundamentals and improve your problem-solving skills.

View All

arrays

Rotate Array by K Positions

This snippet demonstrates how to rotate an array to the right by K positions using the reverse algorithm. Instead of shifting elements one by one, it reverses the entire array, then reverses the first K elements and finally the remaining elements. This approach is optimal and widely used in coding interviews due to its O(n) time complexity and O(1) extra space.

ArrayRotationReverse Algorithm

Time: O(n) | Space: O(1)

Keep Building with Java

Consistent practice is the fastest way to master Java. Explore more snippets, understand different approaches, and build a strong coding foundation.

Explore Library

Brewing your snippet...

Brewing your snippet...

Reverse an Array

Featured

6

19 Jul 2026

Not Updated

Complete Java Solution

Related Topics

Java Library

Rotate Array by K Positions

Related Java Snippets

Rotate Array by K Positions

Keep Building with Java