从特定日期获取日期,月份和年份

Question

我想从特定日期获得日期,月份和年份.

我使用下面的代码:

 String dob = "01/08/1990";

        int month = 0, dd = 0, yer = 0;

        try {

            SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
            Date d = sdf.parse(dob);
            Calendar cal = Calendar.getInstance();
            cal.setTime(d);
            month = cal.get(Calendar.MONTH);
            dd = cal.get(Calendar.DATE);
            yer = cal.get(Calendar.YEAR);

        } catch (Exception e) {
            e.printStackTrace();
        }

所以从上面的代码我得到了 month -0 , yer - 1990 and date - 8

但我想要month - 01 , date - 08 and yer - 1990.

我也定义了日期格式,但我没有从日期,月份和年份获得完美的价值.

Answer 1

日历中的月份将是0-11.您必须在月内添加+1.

String dob = "01/08/1990";
String month = 0, dd = 0, yer = 0;
try {
     SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
     Date d = sdf.parse(dob);
     Calendar cal = Calendar.getInstance();
     cal.setTime(d);
     month = checkDigit(cal.get(Calendar.MONTH)+1);
     dd = checkDigit(cal.get(Calendar.DATE));
     yer = checkDigit(cal.get(Calendar.YEAR));

} catch (Exception e) {
     e.printStackTrace();
}

用于添加前零的checkDigit方法.checkDigit()方法返回String值.如果你想要整数转换,那么你可以这样做Integer.parseInt(YOUR_STRING);

// ADDS 0  e.g - 02 instead of 2
    public String checkDigit (int number) {
        return number <= 9 ? "0" + number : String.valueOf(number);
    }