Reverse an Array in Java

Question

I am new to Java, can someone help me with the method and code to reverse an Array? Thank you soo much

Answer 1

To reverse an array, here is the method:

public class RevArray {
   public static void main(String[] args) {
      int[] arr = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
      System.out.println("Array before reverse:");
      
      for (int i = 0; i < arr.length; i++) {
         System.out.print(arr[i] + " ");
      } 
      for (int i = 0; i < arr.length / 2; i++) {
         int temp = arr[i];
         arr[i] = arr[arr.length - 1 - i];
         arr[arr.length - 1 - i] = temp;
      } 
      System.out.println("\nArray after reverse:");
      for (int i = 0; i < arr.length; i++) {
         System.out.print(arr[i] + " ");
      } 
   }
}

Answer 2

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.