Finding second occurrence of a substring in a string in Java

Question

We are given a string, say, \"itiswhatitis\" and a substring, say, \"is\". I need to find the index of \'i\' when the string \"i

Answer 1

i think a loop can be used.

1 - check if the last index of substring is not the end of the main string.
2 - take a new substring from the last index of the substring to the last index of the main string and check if it contains the search string
3 - repeat the steps in a loop