Reply: A calendar Program (basically every line has a comment)
Import java. AWT .*;
Import java. AWT. event .*;
Import javax. Swing .*;
Import java. util .*;Public class calendertrain extends jframe implements actionlistener {
Jcombobox month = new jcombobox (); // month drop-down list box
Jcombobox year = new jcombobox (); // year drop-down list box
Jlabel year_l = new jlabel ("Year:"); // define a label
Jlabel month_l = new jlabel ("month:"); // define a label
Date now_date = new date (); // obtain the date of today
Jbutton [] button_day = new jbutton [49]; // defines an array to store dates
Jbutton button_ OK = new jbutton ("OK"); // specifies the actual date.
Jbutton button_today = new jbutton ("today"); // display the today button
Int now_year = now_date.getyear () + 1900; // obtain the year value.
Int now_month = now_date.getmonth (); // obtain the month value (current month-1)
String year_int = NULL; // YEAR OF STORAGE
Int month_int; // month
Jpanel pane_ym = new jpanel (); // place the drop-down list box and control button panel
Jpanel pane_day = new jpanel (); // place the date panel
Jpanel pane_parent = new jpanel (); // place the above two panels
// Define a method to draw a panel
Public calendertrain (){
Super ("calender! "); // Set the title of the Panel
// --- The following lines exit the program when the Panel is closed:
Setdefaclocloseoperation (dispose_on_close );
Addwindowlistener (New windowadapter (){
Public void windowclose (windowevent e ){
System. Exit (0 );
}
});
//---
Setresizable (false); // The Panel size cannot be changed.
// Set the year and month
/* The year range is the next 20 years from the past 10 years of the current year to the current year.
* The month is normal. 1 ?? December
*/
For (INT I = now_year-10; I <= now_year + 20; I ++ ){
Year. additem (I + "");
}
For (INT I = 1; I <13; I ++ ){
Month. additem (I + "");
}
Year. setselectedindex (10); // set the year drop-down list to the current year.
Pane_ym.add (year_l); // Add the year label
Pane_ym.add (year); // Add the year drop-down list box
Month. setselectedindex (now_month); // you can specify the month drop-down list as the current month.
Pane_ym.add (month_l); // Add the month tag
Pane_ym.add (month); // Add a month drop-down list box
Pane_ym.add (button_ OK); // Add the OK button
Pane_ym.add (button_today); // Add the "Today" button
Button_ OK .addactionlistener (this); // click the OK button to add a listener event.
Button_today.addactionlistener (this); // click "today" to add a listener event
// The End of the year/month setting
// Initialize the date button and draw it
Pane_day.setlayout (New gridlayout (7, 7, 10, 10 ));
For (INT I = 0; I <49; I ++ ){
Button_day [I] = new jbutton ("");
Pane_day.add (button_day [I]);
}
This. setday (); // call the setday () method
Pane_parent.setlayout (New borderlayout (); // sets the layout manager.
Setcontentpane (pane_day );
Setcontentpane (pane_ym );
Pane_parent.add (pane_day, borderlayout. South );
Pane_parent.add (pane_ym, borderlayout. North );
Setcontentpane (pane_parent );
Pack ();
Show ();
}
Void setday (){
Year_int = year. getselecteditem (). tostring ();
Month_int = month. getselectedindex ();
Int year_sel = integer. parseint (year_int)-1900; // obtain the year value.
Date dt = new date (year_sel, month_int, 1); // construct a date
Gregoriancalendar Cal = new gregoriancalendar (); // create a calendar instance
Cal. settime (DT );
String week [] = {"sun", "mon", "Tue", "wed", "Thur", "fri", "sat "};
Int day = 0; // the number of days in a month
Int day_week = 0; // used to store the values of the day of the week on the first day of a month.
// -- Add the week to the first seven buttons
For (INT I = 0; I <7; I ++ ){
Button_day [I]. settext (week [I]);
}
//--
/* Determine the month, and set the value of day based on it.
* In February, you must determine whether it is a leap year.
*/
If (month_int = 0
| Month_int = 2
| Month_int = 4
| Month_int = 6
| Month_int = 7
| Month_int = 9
| Month_int = 11 ){
Day = 31;
} Else if (
Month_int = 3
| Month_int = 5
| Month_int = 8
| Month_int = 10 ){
Day = 30;
} Else {
If (Cal. isleapyear (year_sel )){
Day = 29;
} Else {
Day = 28;
}
}
Day_week = 7 + dt. getday ();
Int COUNT = 1;
/* Draw button
* Here, we first need to determine the start position of the button Based on the day of the selected month and the day of the week.
* Day_week is the starting position of the image to be drawn.
* The buttons without numeric values should be left blank.
*/
For (INT I = day_week; I <day_week + day; count ++, I ++ ){
If (I % 7 = 0
| I = 13
| I = 20
| I = 27
| I = 48
| I = 34
| I = 41 ){
Button_day [I]. setforeground (color. Red );
Button_day [I]. settext (count + "");
} Else {
Button_day [I]. settext (count + "");
} }
// -- Empty button without date value display
If (day_week = 0 ){
For (INT I = day; I <49; I ++ ){
Button_day [I]. settext ("");
}
} Else {
// Set the button in front of the first day to null
For (INT I = 7; I <day_week; I ++ ){
Button_day [I]. settext ("");
} // The button after the last day is blank
For (INT I = day_week + day; I <49; I ++ ){
Button_day [I]. settext ("");
}
} }
Public void actionreceivmed (actionevent e ){
If (E. getsource () = button_ OK ){
This. setday (); // if you click OK, call setday () to redraw the method.
} Else if (E. getsource () = button_today ){
New calendertrain (); // if you click the today button, get the date of today
}
}
Public static void main (string [] ARGs ){
Calendertrain Ct = new calendertrain ();
}
} |
