Problem $2\mathrm{.}1(10$pts$)$: The method count is to return the total number of the letter $\text{'}a\text{'}$ in the String parameter. If there is no $\text{'}a\text{'}$ in the parameter String, the method should return $0.$ The method header is as follows:

public static int count$($String str$)$

Some examples are given below.

count$("$apple$")1$

count$("$banana$")3$

count $("$kiwi$")0$

$(10$ points$)$ Write an iterative implementation for the method count using Java.