帮我想想这个程序该怎么写?
给定出生日，计算与此对应的是星期几。
[解决办法]
这个需要想吗？
[解决办法]
import java.io.*;
class TheDay
{
public static void main(String[] args)
{
//System.out.println( "Hello World! ");
DataInputStream dis;
int year;
int month;
int day;
try
{
dis=new DataInputStream(System.in);
System.out.print( "Year: ");
year=Integer.parseInt(dis.readLine());
System.out.print( "Month: ");
month=Integer.parseInt(dis.readLine());
System.out.print( "Day: ");
day=Integer.parseInt(dis.readLine());
System.out.print( "这天是： ");
System.out.println(WeekDay.nameOfWeekday(year,month,day));
}
catch(IOException e)
{
System.out.println( "输入日期错误！！！！！ ");
}
}
}
class WeekDay
{
/*public static int weekdayOfFirstDayOfTear(int year)
{
int tem=year-1;
return(tem+tem/4-tem/100+tem/400)%7;
}*/
public static boolean isRunNian(int year)
{
if (year%4==0&&year%100!=0)
return true;
else if(year%400==0)
return true;
else
return false;
}
public static int weekDay(int year,int month,int day)
{
//int firstDay=weekdayOfFirstDayOfTear(year);
int tem=year-1;
int monthDays[]=new int[12];
for(int i=0;i <7;i++)
{
if(i%2==0)
monthDays[i]=31;
else
monthDays[i]=30;
}
if(isRunNian(year))
monthDays[1]=29;
else
monthDays[1]=28;
for(int i=7;i <12;i++)
{
if(i%2==0)
monthDays[i]=30;
else
monthDays[i]=31;
}
int total=day;
for(int i=0;i <month-1;i++)
total+=monthDays[i];
return (total+tem+(int)(tem/4)-(int)(tem/100)+(int)(tem/400))%7;
}
public static String nameOfWeekday(int year,int month,int day)
{
int weekday=weekDay(year,month,day);
switch(weekday)
{
case 0:
return "Sunday ";
case 1:
return "Monday ";
case 2:
return "Tuesday ";
case 3:
return "Wendsday ";
case 4:
return "Thursday ";
case 5:
return "Friday ";
case 6:
return "Saturday ";
default:
return "Error ";
}
}
};
--------------------------
以前写的，你拿去看看
[解决办法]
java.util Class Date
有个一个方法 getTime（）
Returns:
the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this date.
也可以利用这个。
[解决办法]
摆脱 用calendar类不好麽？
[解决办法]
Calendar c = Calendar.getInstance();
c.get(Calendar.DAY_OF_WEEK)//用这个方法能得到星期几
[解决办法]
public static int getWeek(String birthday) {
Calendar c = Calendar.getInstance();
c.set(Integer.parseInt(birthday.substring(0, 4)), Integer
.parseInt(birthday.substring(4, 6))-1, Integer.parseInt(birthday
.substring(6, 8)));
return c.get(Calendar.DAY_OF_WEEK) - 1;
}
随便写了一下，楼主自己再改改吧，思路也就这样
[解决办法]
import java.util.GregorianCalendar;
import java.util.Calendar;
public class XunZhaoRiQi{
private int a;
public XunZhaoRiQi(int nian , int yue ,int tian){
GregorianCalendar c = new GregorianCalendar(nian,yue-1,tian);
a = c.get(DAY_OF_WEEK)-1;=====> 指示当前一个星期中的某一天，即为星期几，因为GregorianCalendar默认是美国的星期算法，他们的是星期日为第一天，所以要减了一个才能知道是星期几．
}
public int getA(){
return a;
}
}
class SouXun{
XunZhaoRiQi a = new XunZhaoRiQi();
System.out.println(a.getA());
}
还有其他的很多代表常量，你可以在Calendar类里面找到，或者查看API文档，地址是util里面的Calendar抽象类．
楼主该结帖了，好些天啦，发分吧．
