根据日期(20050907)获得这是星期几?

Question

根据日期(20050907)获得这是星期几?

Answer 1

Calendar cal = Calendar.getInstance();
int day = cal.get(Calendar.DAY);

Answer 2

          Calendar cd = Calendar.getInstance();
          int mydate = cd.get(Calendar.DAY_OF_WEEK);
          String showDate = "";
          switch(mydate){
                 case 1:
            showDate = "星期日";
            break;
           case 2:
            showDate = "星期一";
            break;
           case 3:
            showDate = "星期二";
            break;
           case 4:
            showDate = "星期三";
            break;
           case 5:
            showDate = "星期四";
            break;
           case 6:
            showDate = "星期五";
            break;
           default:
            showDate = "星期六";
            break;
          }
          
          System.out.println(showDate);

Answer 3

int day = cal.get(Calendar.DAY);
Calendar中没有这个Calendar.DAY???

Answer 4

public void showDay( int year, int month, int day ){
    在这里根据传入的年,月,日,来判断这一天是星期几,比如:20050907,今天是星期三,返回的值为3,明天星期四,返回的值为4,20050925是星期六,返回的值是6
}

Answer 5

SimpleDateFormat dateFormat=new SimpleDateFormat("yyyyMMdd");
        
        try {
            Date date=dateFormat.parse("20050907");
            System.out.print(date.getDay());
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

Answer 6

别忘了在开头引入：
import java.text.SimpleDateFormat;
import java.util.Date;

Answer 7

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
        Date date = null;
        try {
            date = dateFormat.parse("20050907");
        } catch (ParseException e) {        }
        Calendar cd = Calendar.getInstance();
        cd.setTime(date);
        int mydate = cd.get(Calendar.DAY_OF_WEEK);
        String showDate = "";
        switch (mydate) {
        case 1:
            showDate = "星期日";
            break;
        case 2:
            showDate = "星期一";
            break;
        case 3:
            showDate = "星期二";
            break;
        case 4:
            showDate = "星期三";
            break;
        case 5:
            showDate = "星期四";
            break;
        case 6:
            showDate = "星期五";
            break;
        default:
            showDate = "星期六";
            break;
        }        System.out.println(showDate);

Answer 8

public static int getDayOfWeek(String argDate) {    if (argDate.length() != 8) {
      throw new IllegalArgumentException("argDate length != 8");
    }    int intArgY = Integer.parseInt(argDate.substring(0, 4));
    int intArgM = Integer.parseInt(argDate.substring(4, 6)) - 1;
    int intArgD = Integer.parseInt(argDate.substring(6));    Calendar calendar = GregorianCalendar.getInstance();
    calendar.set(intArgY, intArgM, intArgD);    int returnDayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);    return returnDayOfWeek;
  }