how to change the value of array

Question about the task

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public static void reverseArray(int[] array) { //write your code here int[] ar=new int[array.length]; for (int i=array.length-1;i>=0;i--) { ar[(array.length-1)-i]=array[i] ; } printArray(ar); }

Let's write a utility for working with arrays. The main functionality is ready: the printArray() method displays all the elements of the array on the console.
What is left for you is just a trifle: implement the reverseArray() method. It should reverse the order of the elements in the array.
The method should only work with arrays of integer values (int[]).

Example:
If the array contains the elements:
1, 2, 3, 4, 5, 6, 7, 8, 9, 0
then after calling the reverseArray() method it should contain:
0, 9, 8, 7, 6, 5, 4, 3, 2, 1

Requirements:

The reverseArray() method must reverse the order of the elements in the array.

package en.codegym.task.pro.task06.task0605; /* Correct order */ public class Solution { public static void main(String[] args) { int[] array = {1, 2, 3, 4, 5, 6, 7, 8, 9, 0}; printArray(array); reverseArray(array); printArray(array); } public static void reverseArray(int[] array) { //write your code here int[] ar=new int[array.length]; // ar=array.reverseArray(); for (int i=array.length-1;i>=0;i--) { ar[(array.length-1)-i]=array[i] ; } printArray(ar); } public static void printArray(int[] array) { for (int i : array) { System.out.print(i + ", "); } System.out.println(); } }

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Abhishek Tripathi

Level 72 , Rewa, India

Expert

9 September 2023, 07:42

you know when you call a method and pass the reference variable you are actually passing a reference not a object itself. Imagine :- 1 You have an array - int[] array1 = {1,2,3,4,5}; 2 You passed it to a method - method(array1); public static void method( int[] array2 ){ //Doing something } 3 By passing an array to a method means - a. Not passing the array itself but passing a reference to the original array ( you can say address to the array). b. You cannot change the original array by changing the new declared array inside the method. c. To change the original array object you have to work on the passed address, not on a new address. I'll attach a pic of this, so you'll get it. 4 So, the answer to your question is that use the passed reference to change the original array don't use a new declared array.