How to find the index of an element in an int array?

Question

How can I find an index of a certain value in a Java array of type int?

I tried using Arrays.binarySearch on my unsorted array, it only som

Answer 1

    Integer[] arr = { 0, 1, 1, 2, 3, 5, 8, 13, 21 };
    List arrlst = Arrays.asList(arr);
    System.out.println(arrlst.lastIndexOf(1));