[英]Java Gregorian calendar outputting wrong date
im working on a Gregorian calendar project where i have to print 100 days from today and day of week of my birthday. 我正在做一个格里高利历计划,我必须从今天和生日的第几天开始打印100天。 The program displays a day, however its the wrong day. 程序显示一天,但是显示错误的一天。 could you guys help me with the problem? 你们能帮我解决这个问题吗? thanks! 谢谢!
import java.util.GregorianCalendar;
public class Gregorian {
public static void main(String[] args)
{
Day today = new Day();
System.out.print("Today: ");
System.out.println(today.toString());
GregorianCalendar Date = new GregorianCalendar();
Date.add(GregorianCalendar.DAY_OF_MONTH, 100);
CalendarUtils utils = new CalendarUtils();
String day = utils.getWeekday(Date.get(GregorianCalendar.DAY_OF_WEEK));
int year=Date.get(GregorianCalendar.YEAR);
int month=Date.get(GregorianCalendar.MONTH);
int dayof=Date.get(GregorianCalendar.DAY_OF_MONTH);
System.out.println("100 days from today: " + year + "/" + month + "/" + dayof + " which is a: " + day);
GregorianCalendar Birthday = new GregorianCalendar(2012,1,1);
String Bday = utils.getWeekday(Birthday.get(GregorianCalendar.DAY_OF_WEEK ));
System.out.println("Weekday of my Birthday: " + Bday );
Birthday.add(GregorianCalendar.DAY_OF_MONTH, 10000);
int Byear=Birthday.get(GregorianCalendar.YEAR);
int Bmonth=Birthday.get(GregorianCalendar.MONTH);
int Bdayof=Birthday.get(GregorianCalendar.DAY_OF_MONTH);
System.out.println("10000 days from my Birthday: " + Byear + "/" + Bmonth + "/" + Bdayof);
Here is the CalendarUtils 这是CalendarUtils
import java.util.GregorianCalendar;
public class CalendarUtils
{
/**
Returns the String for GregorianCalendar DAY_OF_WEEK
*/
public String getWeekday(int day_of_week)
{
String day = "";
if (day_of_week == GregorianCalendar.SUNDAY)
{
day = "Sunday";
}
else if (day_of_week == GregorianCalendar.MONDAY)
{
day = "Monday";
}
else if (day_of_week == GregorianCalendar.TUESDAY)
{
day = "Tuesday";
}
else if (day_of_week == GregorianCalendar.WEDNESDAY)
{
day = "Wednesday";
}
else if (day_of_week == GregorianCalendar.THURSDAY)
{
day = "Thursday";
}
else if (day_of_week == GregorianCalendar.FRIDAY)
{
day = "Friday";
}
else if (day_of_week == GregorianCalendar.SATURDAY)
{
day = "Saturday";
}
return day;
}
/**
Returns the string of GregorianCalendar MONTH
*/
public String getMonth(int month)
{
String monthStr = "";
if (month == GregorianCalendar.JANUARY)
{
monthStr = "January";
}
else if (month == GregorianCalendar.FEBRUARY)
{
monthStr = "February";
}
else if (month == GregorianCalendar.MARCH)
{
monthStr = "March";
}
else if (month == GregorianCalendar.APRIL)
{
monthStr = "April";
}
else if (month == GregorianCalendar.MAY)
{
monthStr = "May";
}
else if (month == GregorianCalendar.JUNE)
{
monthStr = "June";
}
else if (month == GregorianCalendar.JULY)
{
monthStr = "July";
}
else if (month == GregorianCalendar.AUGUST)
{
monthStr = "August";
}
else if (month == GregorianCalendar.SEPTEMBER)
{
monthStr = "September";
}
else if (month == GregorianCalendar.OCTOBER)
{
monthStr = "October";
}
else if (month == GregorianCalendar.NOVEMBER)
{
monthStr = "November";
}
else if (month == GregorianCalendar.DECEMBER)
{
monthStr = "December";
}
return monthStr;
}
}
LocalDate.now() // Determine current date (no time-of-day) for the JVM’s current default time zone.
.plusDays( 100 ) // Add days.
.getDayOfWeek() // Get `DayOfWeek` enum object.
.getDisplayName( FormatStyle.FULL , Locale.ITALY ) // Generate a string of the name of this day-of-week automatically localized with a certain length/abbreviation.
The troublesome Calendar
class is now legacy, supplanted by the java.time classes. 麻烦的Calendar
类现在已被遗留,由java.time类取代。
You want to add a hundred days after today. 您想在今天之后增加一百天。
LocalDate today = LocalDate.now();
LocalDate hundred = today.plusDays( 100 );
You want the day-of-week of your birthday this year. 您想要今年生日的星期几。
MonthDay birthday = MonthDay.of( Month.JANUARY , 23 );
LocalDate birthdayThisYear = birthday.atYear( today.getYear() );
DayOfWeek dow = birthdayThisYear.getDayOfWeek();
You want the name of month and name of day-of-week. 您需要月份的名称和星期几的名称。 Let java.time automatically localize for you. 让java.time自动为您本地化。
Locale locale = Locale.CANADA_FRENCH ; // Or Locale.US, etc.
String m = today.getMonth().getDisplayName( TextStyle.FULL , locale );
String d = dow.getDisplayName( TextStyle.FULL , locale );
I suppose you want to enter the 1st of January 2012 as the birthday? 我想您要输入2012年1月1日作为生日吗? The the correct line would be: 正确的行是:
GregorianCalendar Birthday = new GregorianCalendar(2012, 0, 1);
or better: 或更好:
GregorianCalendar Birthday = new GregorianCalendar(2012, Calendar.JANUARY, 1);
The month is zero based (0 = January, 1 = February,...). 月份从零开始(0 =一月,1 =二月,...)。 And this results in the output: Weekday of my Birthday: Sunday 结果是: 我生日的工作日:周日
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