Java Program to Reverse an Array - The Coding Shala

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 In this post, we will learn how to Reverse an Array in Java.

Java Program to Reverse an Array

You have given an Array, Write a Java Program to Reverse the given array.

Example 1:

Input: arr = {1,2,3,4,5}

Output: arr = {5,4,3,2,1}

Approach 1

We can use an extra array to store the elements in reverse order then copy all the elements into the original array.

The alternate way is we can swap elements in the same array. For example, swap the first element with the last element, swap the second element with the second last element and continue.

Java Program: 

// Java program to Reverse an Array

public class Main {
	
	public static void main(String[] args) { 
		
		int[] arr = {1, 2, 3, 4, 5};
		
		System.out.println("Before Reverse array is: ");
		for (int i = 0; i < arr.length; i++) {
			System.out.print(arr[i] + " ");
		}
		System.out.println();
		
		// swap ith and length-ith element
		for (int i = 0; i < arr.length / 2; i++) {
			int temp = arr[i];
			arr[i] = arr[arr.length - i - 1];
			arr[arr.length - i - 1] = temp;
		}
		
		// print array
		System.out.println("Reversed Array is: ");
		for (int i = 0; i < arr.length; i++) {
			System.out.print(arr[i] + " ");
		}
	}
}

Output: 

Before Reverse array is: 
1 2 3 4 5 
Reversed Array is: 
5 4 3 2 1 

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