Write a Java program to reverse an array of integer, e.g. [1,3,8,6] -> [6,8,3,1]

Sure, here's a Java program to reverse an array of integers:

public class ReverseArray {
    public static void main(String[] args) {
        int[] arr = {1, 3, 8, 6};
        int[] reversedArr = reverseArray(arr);
        System.out.println(Arrays.toString(reversedArr));
    }

    public static int[] reverseArray(int[] arr) {
        int[] reversedArr = new int[arr.length];
        for (int i = 0; i < arr.length; i++) {
            reversedArr[arr.length - i - 1] = arr[i];
        }
        return reversedArr;
    }
}

This program defines a function `reverseArray` that takes an array of integers as input and returns a new array with the elements in reverse order. The `main` function creates an array with the values `[1, 3, 8, 6]`, calls the `reverseArray` function to reverse the array, and then prints the reversed array using the `Arrays.toString` method.