Last Index

 

public class LastIndex {
    public static void main(String[] args) {
        int[] arr = new int[]{0, 1, 2, 3, 2, 4, 5};
        int num = 2;
        int ans = lastIndex(arr, num, 0);
        System.out.println(ans);
    }

    private static int lastIndex(int[] arr, int ele, int idx) {
        if (idx == arr.length) {
            return -1;
        }
        int val = lastIndex(arr, ele, idx + 1);
        if (arr[idx] == ele && idx > val) {
            val = idx;
        }
        return val;
    }
}