Hey, I have a question from my data structures class. I took java a year ago and am very rusty. Really need help writing this code. Here is the QUESTION:

Return the number of times that the string "hi" appears anywhere in the given string.

OUTPUT GIVEN:

countHi("abc hi ho") 1 countHi("ABChi hi") 2 countHi("hihi") 2

GIVEN:

public int countHi(String str) { }