JAVA 計算兩個日期相差年份

代碼如下：

public static void main(String[] args) throws ParseException{

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String str1 = "2014-02-06";
        String str2 = "2012-02-05";
        Calendar bef = Calendar.getInstance();
        Calendar aft = Calendar.getInstance();
        bef.setTime(sdf.parse(str1));
        aft.setTime(sdf.parse(str2));
        int surplus = aft.get(Calendar.DATE) - bef.get(Calendar.DATE);
        int result = aft.get(Calendar.MONTH) - bef.get(Calendar.MONTH);
        int year = aft.get(Calendar.YEAR) - bef.get(Calendar.YEAR);
        System.out.println(result);
        if(result < 0){
            result = 1;
        }else if(result == 0){
            result = surplus <= 0 ? 1 : 0;
        }else{
            result = 0;
        }
        System.out.println(result);
        System.out.println("相差年份：" + ((Math.abs(year)) + result));

}

運行結果：

0
1
相差年份：3

Process finished with exit code 0