Find the occurrence of a given character in the string.

public class Test {

    public static void main(String[] args) {
        String str = "Ironman Spiderman Thor BlackWidow Captain-America";
        char c = 'a';

        System.out.println( "The occurrence of a " + c + " in string : " + count(str, c));
    }

    private static int count(String str, char c) {
        int ans = 0;

        for (int i = 0; i <= str.length()-1; i++) {
            if (c == str.charAt(i)) {
                ans++;
            }
        }
        return ans;
    }
}