Calendar class for javaapi Learning

The following are common fields and methods in the calendar class:

Package util; import Java. text. simpledateformat; import Java. util. calendar; import Java. util. date; /***** @ author yjmao * @ deprecated calendar common methods and common attribute summary * @ version v1.0.0 */public class learncalendar {public static void main (string [] ARGs) {// common method param (); // common attribute method () ;}// common method public static void method () {date = new date (); calendar c = calendar. getinstance (); // settime (): Use the given date to set this Cal Endar time C. settime (date); // obtain the Calendar Object calendar CM = calendar. getinstance (); // gettime (): Get the current time, similar to new date (); Date d = cm. gettime (); system. err. println ("calendar acquisition time:" + d); system. err. println ("new date creation time:" + date); // gettimeinmillis (): returns the time value of this calendar, in milliseconds. Long DL = C. gettimeinmillis (); long ddate = cm. gettimeinmillis (); system. err. println ("milliseconds:" + dl); system. err. println ("millisecond count:" + ddate); // settimeinmillis (): set the current time value of the calendar with the given long value. Long SV = 123456; Calendar SC = calendar. getinstance (); SC. settimeinmillis (SV); simpledateformat Ss = new simpledateformat ("yyyy-mm-dd hh: mm: SS"); string ST = ss. format (SC. gettime (); system. err. println (ST); // get (): returns the value of the given calendar field. Int year = C. get (calendar. year); system. err. println (year); // set (): sets the specified calendar field to the specified value c. set (calendar. year, 2); int y = C. get (calendar. year); system. err. println (y); // output 2 // calendar comparison: Before (), after (), equals (), compareto (). try {string starttime = "12:45:39"; string endtime = "12:45:40"; simpledateformat SDF = new simpledateformat ("yyyy-mm-dd hh: mm: SS "); date startdate = SDF. parse (starttime); Date enddate = SDF. parse (endtime); calendar start = calendar. getinstance (); calendar end = calendar. getinstance (); start. settime (startdate); end. settime (enddate); If (start. before (end) {system. err. println ("the start time is earlier than the end time");} else if (start. after (end) {system. err. println ("the start time is later than the end time");} else if (start. equals (end) {system. err. println ("Start time equals End Time");}/** start <End returns-1 * Start = end returns 0 * Start> end returns 1 */int count = start. compareto (end); system. err. println (count); // Add (): add or subtract the specified start time for a given calendar field. add (calendar. year,-3); system. err. println ("original time:" + starttime); system. err. println ("time after add:" + SDF. format (start. gettime (); // tostring (): converts the string to system. err. println (start. tostring ();} catch (exception e) {}} // common attribute public static void param () {date = new date (); Calendar c = calendar. getinstance (); C. settime (date); // calendar. year: The Year in the date int year = C. get (calendar. year); // calendar. month: the month in the date. You need to add 1 int mounth = C. get (calendar. month) + 1; // calendar. date: day int day = C. get (calendar. date); // calendar. hour: The hour in the date (in 12-hour format) int hour = C. get (calendar. hour); // calendar. hour_of_day: 24-hour int hour_of_day = C. get (calendar. hour_of_day); // calendar. minute: minute int minute = C. get (calendar. minute); // calendar. second: Second int second = C. get (calendar. second); system. err. println (Year + "-" + mounth + "-" + day + "" + hour + ":" + minute + ":" + second); // calendar. week_of_year: number of stars in the current year int week_of_year = C. get (calendar. week_of_year); // calendar. week_of_month: number of stars in the current month int week_of_month = C. get (calendar. week_of_month); // calendar. day_of_year: The day in the current year int day_of_year = C. get (calendar. day_of_year); // calendar. day_of_month: The day in the current month int day_of_month = C. get (calendar. day_of_month); // calendar. day_of_week: the day of the current week (Sunday indicates the first day, Saturday indicates the seventh day) int day_of_week = C. get (calendar. day_of_week); // calendar. day_of_week_in_month: The Week in the current month int day_of_week_in_month = C. get (calendar. day_of_week_in_month); try {simpledateformat format = new simpledateformat ("yyyy-mm-dd hh: mm: SS"); Date ampm = format. parse ("21:59:59"); Calendar cc = calendar. getinstance (); CC. settime (ampm); // am_pm: whether hour is before or after noon, 0 is returned before noon, and is returned at noon (including) then 1 int am_pm = Cc is returned. get (calendar. am_pm);} catch (exception e ){}}}