import java.util.Arrays;
 
class GfG {
 
    // function to reverse an array
    static void reverseArray(int[] arr) {
        int n = arr.length;
 
        // Temporary array to store elements in reversed order
        int[] temp = new int[n];
 
        // Copy elements from original array to temp in reverse order
        for (int i = 0; i < n; i++)
            temp[i] = arr[n - i - 1];
 
        // Copy elements back to original array
        for (int i = 0; i < n; i++)
            arr[i] = temp[i];
    }
 
    public static void main(String[] args) {
        int[] arr = { 1, 4, 3, 2, 6, 5 };
 
        reverseArray(arr);
 
        for (int i = 0; i < arr.length; i++) 
            System.out.print(arr[i] + " ");
    }
}

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OCAKMSAyIDMgNCA1IDYgNyA4

8 
1 2 3 4 5 6 7 8