There are multiple ways we can perform how to Reverse an array in java with example. Reversing an array is an easy question. Let understand the question through the example :
Input : {3, 8, 5, 7, 4}
Output : {4, 7, 5, 8, 3}
Input : {10, 54, 23, 89, 97, 2}
Output : {2, 97, 89, 23, 54, 10}
Read Also : How to reverse a string in java with Example
Pseudo Code for Reverse Array in Java Method 1:
1. Swap the values of left indices with the right indices till the mid element.
Please find the reverse an array in java image below for method 1:
Pseudo Code for Reverse Array in Java Method 2:
1. Convert the object array to the list.
2. Reverse the list using Collections.reverse() method
3. Convert the list back to the array.
Please mention in the comments in case if you know any other way to reverse array in java.
Input : {3, 8, 5, 7, 4}
Output : {4, 7, 5, 8, 3}
Input : {10, 54, 23, 89, 97, 2}
Output : {2, 97, 89, 23, 54, 10}
Read Also : How to reverse a string in java with Example
Pseudo Code for Reverse Array in Java Method 1:
1. Swap the values of left indices with the right indices till the mid element.
import java.util.*;
class ReverseArray
{
public static void main (String[] args) throws java.lang.Exception
{
int[] temp = {3,7,9,6,4};
System.out.println("Array without reverse" + Arrays.toString(temp));
reverseArray(temp);
}
public static void reverseArray(int[] data) {
for (int left = 0, right = data.length - 1; left right; left++, right--){
// swap the values at the left and right indices
int temp = data[left];
data[left] = data[right];
data[right] = temp;
}
System.out.print("Reverse Array :");
for(int val : data)
System.out.print(" "+val);
}
}
Please find the reverse an array in java image below for method 1:
| Reverse Array in Java Example |
Pseudo Code for Reverse Array in Java Method 2:
1. Convert the object array to the list.
2. Reverse the list using Collections.reverse() method
3. Convert the list back to the array.
public static Object[] reverseArray(Object[] arr) {
ListObject> list = Arrays.asList(arr);
Collections.reverse(list);
return list.toArray();
}
Please mention in the comments in case if you know any other way to reverse array in java.
