字符串中重复出现字符串个数

  public static void main(String[] args) {
        String a = "1;2;1;4;5;6;7;8;9;0";
        String[] b = a.split(";");
        for (int i = 0; i < b.length; i++) {
            int count1 = substringCount(a, b[i]);
            System.out.println(count1);
            if (count1 > 1) {
                a = a.replace(b[i], "");
            }
        }
    }

    public static int substringCount(String str, String substring) {
        if (str.contains(substring)) {
            String strReplaced = str.replace(substring, "");
            return (str.length() - strReplaced.length()) / substring.length();
        }
        return 0;
    }