高分求救如何根据年份，月份，在该月份的第几周，星期几算出日期

Question

public static void main(String[] args) {
Calendar cal = Calendar.getInstance();
   cal.set(2004,Calendar.MAY,1);
   cal.set(Calendar.WEEK_OF_MONTH,2);
   cal.set(Calendar.DAY_OF_WEEK,Calendar.WEDNESDAY);
   System.out.println("2004年5月第2周，星期三是几号"+cal.get(Calendar.DAY_OF_MONTH));
   }

Answer 1

先给你这个段程序参考
import java.util.Calendar;
import java.util.GregorianCalendar;public class test {    static public void main(String[] args) throws Exception {
        Calendar calendar = new GregorianCalendar();
         System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
         System.out.println("MONTH: " + calendar.get(Calendar.MONTH));
         System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR));
         System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH));
         System.out.println("DATE: " + calendar.get(Calendar.DATE));
         System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
         System.out.println("DAY_OF_YEAR: " + calendar.get(Calendar.DAY_OF_YEAR));
         System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK));
         System.out.println("DAY_OF_WEEK_IN_MONTH: "
                            + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
    }}

Answer 2

我写了一个方法供你调用，不过里面的参数weekDay表示星期几，1到6
表示星期一到星期六，0表示星期日，不过这个方法存在问题，他不能得到
和系统日期相符的日期，只是得到了以那个月的一号开始的日期。import java.util.Calendar;public class Test
{
  public int getDay(int year,int month,int weekNO,int weekDay)
  {
    Calendar c = Calendar.getInstance();
    c.set(Calendar.YEAR,year);
    c.set(Calendar.MONTH,month);
    c.set(Calendar.WEEK_OF_MONTH,weekNO);
    c.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY);
    
    return c.get(Calendar.DATE);
  }
  public static void main(String[] args) {
   Test test = new Test();
   System.out.println(test.getDay(2004,7,4,4));
  }
}