printing the indices of a key in an array

 //PRINTING THE INDICES OF A KEY IN AN ARRAY

public class practice1 {

    public static void printind(int key, int arr[], int index) {

        if (index == arr.length) {

            return;

        }

        if (arr[index] == key) {

            System.out.println(index);

        }

        printind(key, arr, index + 1);

    }

    public static void main(String[] args) {

        int arr[] = { 3, 2, 4, 5, 6, 2, 7, 2, 2 };

        printind(2, arr, 0);

    }

}