I am trying to create a method that will count number of zeros in a statement/numbers (numOfZero), that a string as input and returns the number of occurrence of ‘0’ in the string.
And if there is no zero it should return zero. I have used String.length() and String.CharAt(int index). but getting some errors. Any help?

It would help if you

  1. posted the code
  2. posted the errors and the corresponding line numbers

We can't answer questions in a vacuum.

I want to add there are many ways to skin this animal.

Example: https://www.baeldung.com/java-count-chars

I see many solutions and the solution you use varies with choices about which Java, whether you want to go native, libraries, recursive or not.