Implement Calendar printing by year and month in Java [calendar based] AND Calendar calendar

Implement Calendar printing by year and month in Java [calendar based] AND Calendar calendar

This example describes how to print a calendar by year and month in Java. We will share this with you for your reference. The details are as follows:

Import java. text. parseException; import java. text. simpleDateFormat; import java. util. calendar; import java. util. date; public class CalendarBook {public static void main (String [] args) throws ParseException {CalendarBook cb = new CalendarBook (); cb. printWeekTitle (); cb. printCalendar (2018, 3);} public void printCalendar (int year, int month) throws ParseException {String monthStr; // format the month because it is converted to yyyyMM If (month <10) {monthStr = "0" + month;} else {monthStr = month + ""; // concatenate digits and strings into the String format} String yearMonthStr = year + monthStr; SimpleDateFormat sdf = new SimpleDateFormat ("yyyyMMdd"); Calendar calendarEnd = Calendar. getInstance (); Calendar calendarStart = Calendar. getInstance (); // obtain the number of days of the input month based on the year and month int monthDays = getMonthLastDay (year, month); // The date String dateStartStr = year at the beginning of the month MonthStr + "01"; // date String dateEndStr = yearMonthStr + monthDays; Date startDate = sdf. parse (dateStartStr); Date endDate = sdf. parse (dateEndStr); calendarStart. setTime (startDate); calendarEnd. setTime (endDate); // obtain the number of weeks in the input month int weeks = calendarEnd. get (Calendar. WEEK_OF_MONTH); // obtain the day of the week on the first day of the month. Here, Sunday is the first day, starting from 1, and Monday is 2 int dayOfWeek = calendarStart. get (Calendar. DAY_OF_WEEK); int day = 1; // the day of the current month Perform special processing in one week and print a single row for (int I = 1; I <= 7; I ++) {if (I> = dayOfWeek) {System. out. print ("" + day + ""); day ++;} else {System. out. print ("") ;}} System. out. println (); // start to print the date for (int week = 1; week <weeks; week ++) {for (int I = 1; I <= 7; I ++) {if (day> monthDays) {break;} if (day <10) {System. out. print ("" + day + "");} else {System. out. print (day + "");} day ++;} System. ou T. println () ;}} public int getMonthLastDay (int year, int month) {int monthDay; int [] [] day = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 31, 31, 30, 31 }}; if (year % 4 = 0 & year % 100! = 0 | year % 400 = 0) {// monthDay of a leap year = day [1] [month];} else {monthDay = day [0] [month];} return monthDay;} public void printWeekTitle () {System. out. println ("day" + "" + "one" + "" + "two" + "+" three "+" "+" four "+" "+" five" + "" + "6 ");}}

Running result (running effect, the best font size on the 5th ):

PS: Here are some online tools for date and time computing for your reference:

Online date/day calculator:
Http://tools.jb51.net/jisuanqi/date_jisuanqi

Online calendar:
Http://tools.jb51.net/bianmin/wannianli

Online calendar/Calendar Conversion Tool:
Http://tools.jb51.net/bianmin/yinli2yangli

Unix timestamp Conversion Tool:
Http://tools.jb51.net/code/unixtime