求代码，给定第几月的第几周，求该周的第一天及最后一天的日期

Question

给定月份及周次，如2006年3月的第4周，求该周的第一天及最后一天的日期和星期几。
注：要求每月的1号固定为一周的开始，即使不是星期一；每月的最后一天固定为一周的周末，即使不是星期日。
请给代码！！！

Answer 1

package test;import java.util.Calendar;class test {
static void prt(int year,int month,int week){
    Calendar cal  = Calendar.getInstance();
    cal.clear();
    cal.set(Calendar.YEAR,2006);
    cal.set(Calendar.MONTH,month-1);
    cal.set(Calendar.WEEK_OF_MONTH,week);
    int dayWeek = 7;
    System.out.println("month:"+cal.get(Calendar.MONTH));
if(cal.get(Calendar.MONTH)<(month-1)){
cal.clear();
cal.set(Calendar.YEAR,2006);
    cal.set(Calendar.MONTH,month-1);
dayWeek =  cal.get(Calendar.DAY_OF_WEEK)+1;
System.out.println("dayWeek:"+dayWeek);
    
}else{
cal.set(Calendar.DAY_OF_MONTH,cal.get(Calendar.DAY_OF_MONTH)+1);

}
dayWeek --;
    System.out.println("the week first:"+cal.get(Calendar.YEAR)+"-"+(cal.get(Calendar.MONTH)+1)+"-"+cal.get(Calendar.DAY_OF_MONTH)+" week"+(cal.get(Calendar.DAY_OF_WEEK)-1));
    
    cal.set(Calendar.DAY_OF_MONTH,cal.get(Calendar.DAY_OF_MONTH)+dayWeek);
if(week==5){
cal.set(Calendar.YEAR,2006);
cal.set(Calendar.MONTH,month);
cal.set(Calendar.DAY_OF_MONTH,0);
}
System.out.println("the week last:"+cal.get(Calendar.YEAR)+"-"+(cal.get(Calendar.MONTH)+1)+"-"+cal.get(Calendar.DAY_OF_MONTH)+" week"+(cal.get(Calendar.DAY_OF_WEEK)-1)); }
public static void main(String []args){
prt(2006,5,5);
//week0:Sunday
}
}

Answer 2

呵呵 我也写了一个
import java.util.*;public class TestCalendar {
    public static void main(String[] args) {
         Date[] date = getMonSun(2,5);
         for(int i = 0;i< 2; i++) {
             System.out.println(date[i]);
         }
    }    public static Date[] getMonSun(int mon, int week) {
        Date[] date = new Date[2];
        Calendar ca = Calendar.getInstance();
        //System.out.println(ca.getTime());  
        ca.set(Calendar.MONTH,mon);
        
       // System.out.println(ca.getTime());   
        ca.set(Calendar.WEEK_OF_MONTH,week);
       // System.out.println(ca.getTime());   
        
        int day = ca.get(Calendar.DAY_OF_WEEK);
        ca.add(Calendar.DAY_OF_YEAR, 8 - day);        date[0] = ca.getTime();        ca.add(Calendar.DAY_OF_YEAR, -6);
        date[1] = ca.getTime();
        
        return date;
    }
}

Answer 3

public static Date[] getMonSun(int mon, int week) { }  忘了注释@return Date[]//返回Date数组,第一个是周日,第二个是周一
@param  mon 月份(注意减1), week 第几周

Answer 4

if(week==5)用if(cal.get(Calendar.MONTH)>(month-1))替换。
不过interpb代码少些。