Java-判断某日期为该年的第几天

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public static void main(String[] args) {
        //2017-12-13
        String str = "12-13";
        //2017年每个月的天数
        List<Integer> dayOfMon = Arrays.asList(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
        int month = Integer.parseInt(str.split("-")[0]);
        int day = Integer.parseInt(str.split("-")[1]);
        int result = (month - 1) * dayOfMon.get(month - 1) + day;
        System.out.println(str + " is the " + result + "th day of this year.");
        }