get index of an array element java

1public class Exercise6 {
2       public static int  findIndex (int[] my_array, int t) {
3        if (my_array == null) return -1;
4        int len = my_array.length;
5        int i = 0;
6        while (i < len) {
7            if (my_array[i] == t) return i;
8            else i=i+1;
9        }
10        return -1;
11    }
12    public static void main(String[] args) {
13      int[] my_array = {25, 14, 56, 15, 36, 56, 77, 18, 29, 49};
14      System.out.println("Index position of 25 is: " + findIndex(my_array, 25));
15      System.out.println("Index position of 77 is: " + findIndex(my_array, 77));
16       }
17}
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