The Java Boutique: KNCalendar - Source - KNCalendar displays a full calendar year for any year specified in the text box.

////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////// // // Calendar Generator. Original program in C, 05/01/90 // v1.0 Converted to Java code. 09/23/99 // Modified from spaghetti code to structured code // v1.1 Added button to inc/dec years. 09/27/99 // v1.2 Made Month and day names bold. 09/29/99 // v1.3 Added 'about' and 'now, buttons. 10/02/99 // v1.4 Added Font and Background color buttons. 10/03/99 // v1.5 Added frames (lines) around Months. 10/08/99 // v2.0 Pop-up window for individual Months 10/10/99 - 10/12/99 // v2.01 Some mouse event changes. Update month in // window each time a month is clicked. 10/13/99 // v2.02 Adjusted lines on month window. 10/14/99 // v2.03 Month windows no longer show empty weeks 10/20/99 // v2.1 Used date class to set year from clock 10/22/99 // v2.2 Made separate applet for printing 05/14/00 // v2.21 Removed monthframe for now 05/16/00 // v2.3 Made Background & Font Colors user selectable 12/31/00 // ////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////// // // This program works by building text lines and printing them out. // // for row = 0 to 3 - 4 rows by 3 columns of months // for week = 0 to 5 - each week is a line and has to include the same week for all 3 months // for column = 0 to 2 - each line includes 3 months // // This is the basic structure of the program. For the 1st week the // start of the week has to be found and blanks inserted before the 1st. // For the remaining weeks, the last day of the month needs to be found // and blanks are inserted prior to the next month. After the 6 weeks are // built for 3 months (1 row) the next row is then worked on the same way. // ////////////////////////////////////////////////////////////////// // Kerry Newman - newman@wt.net // http://web.wt.net/~newman/ import java.applet.*; import java.awt.*; import java.net.*; import java.util.*; public class calendar extends Applet { Button m100; //year decrement buttons. Button m10; Button m1; Button p1; //year increment buttons. Button p10; Button p100; Button about; //URL on calendar history Button now; Button fontColor; Button backColor; Button print; TextField yearbox; //box for year int day[] = new int[12]; int year, dayofweek; int lineinc = 16; int lindex; int FontIndex, BackIndex; String line = ""; ///////////////////////////////////////////////////////////////// ///// Read Date from the computer to setup initial display ///// ///////////////////////////////////////////////////////////////// Calendar ReadTime = Calendar.getInstance(); int CurrentYear = ReadTime.get(Calendar.YEAR); public void init() { backColor = new Button("BackColor"); about = new Button("About"); m100 = new Button("-100"); m10 = new Button("-10"); m1 = new Button("-1"); yearbox = new TextField(4); //box to put year in. p1 = new Button("+1"); p10 = new Button("+10"); p100 = new Button("+100"); now = new Button("Now"); fontColor = new Button("FontColor"); print = new Button("Print"); FlowLayout Buttons = new FlowLayout(FlowLayout.CENTER, 10, 7 ); setLayout(Buttons); add ( fontColor ); add ( now ); add ( m100 ); //Year buttons. add ( m10 ); add ( m1 ); add ( yearbox ); add ( p1 ); add ( p10 ); add ( p100 ); add ( about ); add ( backColor ); add ( print ); yearbox.setText(String.valueOf(CurrentYear)); //initialize year to current String s = getParameter("Fcolor"); int FColor = Integer.parseInt(s); FontIndex = FColor; //index counter for Font color s = getParameter("Bcolor"); int BColor = Integer.parseInt(s); BackIndex = BColor; //index counter for Back color } ///////////////////////////////////////////////////////////////// ////////////////////// Initial Setup //////////////////////////// ///////////////////////////////////////////////////////////////// public void paint( Graphics g ) { Font font1 = new Font( "Courier", Font.PLAIN, 16 ); //Fixed width font needed Font font2 = new Font( "Courier", Font.BOLD, 16 ); switch ( BackIndex ) //Background Color settings { case 0: setBackground( Color.black ); break; case 1: setBackground( Color.blue ); break; case 2: setBackground( Color.cyan ); break; case 3: setBackground( Color.darkGray ); break; case 4: setBackground( Color.gray ); break; case 5: setBackground( Color.lightGray ); break; case 6: setBackground( Color.green ); break; case 7: setBackground( Color.magenta ); break; case 8: setBackground( Color.orange ); break; case 9: setBackground( Color.pink ); break; case 10: setBackground( Color.red ); break; case 11: setBackground( Color.white ); break; case 12: setBackground( Color.yellow ); break; } switch ( FontIndex ) //Font Color settings { case 0: g.setColor( Color.black ); break; case 1: g.setColor( Color.blue ); break; case 2: g.setColor( Color.cyan ); break; case 3: g.setColor( Color.darkGray ); break; case 4: g.setColor( Color.gray ); break; case 5: g.setColor( Color.lightGray ); break; case 6: g.setColor( Color.green ); break; case 7: g.setColor( Color.magenta ); break; case 8: g.setColor( Color.orange ); break; case 9: g.setColor( Color.pink ); break; case 10: g.setColor( Color.red ); break; case 11: g.setColor( Color.white ); break; case 12: g.setColor( Color.yellow ); break; } ////////////////////////////////////////////// ////////// Draw Frame around Months ////////// ////////////////////////////////////////////// g.drawRect( 0, 0, 779, 679 ); // main box g.drawLine( 260, 40, 260, 680 ); // Center verticle lines g.drawLine( 520, 40, 520, 680 ); g.drawLine( 0, 40, 780, 40 ); // Lines around buttons g.drawLine( 0, 72, 780, 72 ); g.drawLine( 0, 200, 780, 200 ); // Horizontal lines around Months g.drawLine( 0, 232, 780, 232 ); g.drawLine( 0, 360, 780, 360 ); g.drawLine( 0, 392, 780, 392 ); g.drawLine( 0, 520, 780, 520 ); g.drawLine( 0, 552, 780, 552 ); g.setFont( font2 ); String Year = yearbox.getText(); year = Integer.parseInt( Year ); if ( year < 1 ) { g.drawString( " Please enter a year of 1 AD or later!!", 10, 100 ); return; } lindex = 60; // initialize writing area each repaint for ( int i = 0; i <= 11; i++ ) day[i] = 1; //initialize day of each Month to 1 ///////////////////////////////////////////////////////////////// ////////////////// Main program flow //////////////////////////// ///////////////////////////////////////////////////////////////// for ( int row= 0 ; row <= 3 ; ++row ) // 4 rows of Months 0-1-2 3-4-5 6-7-8 9-10-11 { g.setFont( font2 ); if ( row != 0 ) lindex += lineinc; switch (row) // Draw Month names { case 0: g.drawString( " ***** JANUARY ****** ***** FEBRUARY ***** ******* MARCH ******", 10, lindex ); break; case 1: g.drawString( " ****** APRIL ******* ******* MAY ******** ******* JUNE *******", 10, lindex ); break; case 2: g.drawString( " ******* JULY ******* ****** AUGUST ****** ***** SEPTEMBER ****", 10, lindex ); break; case 3: g.drawString( " ***** OCTOBER ****** ***** NOVEMBER ***** ***** DECEMBER *****", 10, lindex ); } lindex += 2*lineinc; //increment line space by 2. One blank line. g.drawString( " Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa", 10, lindex ); lindex += lineinc; for ( int week = 0 ; week <= 5 ; ++week ) //week loops. one line includes one week for 3 Months. { g.setFont( font1 ); line = " "; for ( int col = 0 ; col <= 2 ; ++col ) //3 Months in a row { if (week == 0) //1st week needs to know what day to start. firstweek( row*3 + col, year ); else otherweek( row*3 + col ); } /* Column end */ g.drawString(line, 10, lindex); //done with line, print it out. lindex += lineinc; line = " "; } // Week end } // Row end } // Paint end ///////////////////////////////////////////////////////////////// /////////////////// first week of the Month ///////////////////// ///////////////////////////////////////////////////////////////// public void firstweek( int Month, int year ) { int dayofweek = firstday ( Month, year ); //get starting day of week. for ( int i = 0 ; i < dayofweek ; i++ ) //print blanks until 1st. line = line.concat(" "); do { line = line.concat( " " + String.valueOf( day[Month] ) ); //print day of Month with leading blanks. ++day[Month]; ++dayofweek; } while (dayofweek <= 6 ); if ( ((Month + 1) % 3) != 0 ) //if last day of week, print spaces between Month. line = line.concat(" "); } ///////////////////////////////////////////////////// /////////////////// weeks 2 - 6 ///////////////////// ///////////////////////////////////////////////////// public void otherweek( int Month ) { dayofweek = 0; //initialize day of week to 0. Sunday int daysinMonth[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; if (((year % 4) == 0) && (((year % 100) != 0) || ((year % 400) == 0))) daysinMonth[1] = 29; do { if ( day[Month] <= daysinMonth[ Month ] ) //check to see if days still left. { if ( day[Month] < 10 ) //if 1-9, 2 leading spaces needed. line = line.concat( " " + String.valueOf( day[Month] ) ); else //if 10-31, 1 leading space needed. line = line.concat( " " + String.valueOf( day[Month] ) ); ++day[Month]; ++dayofweek; } else { line = line.concat(" "); //if after last day of Month, print blanks. ++dayofweek; } } while ( dayofweek <= 6 ); if ( ((Month + 1) % 3) != 0 ) //if last day of week, print spaces between Month. line = line.concat(" "); } //end of otherweek ///////////////////////////////////////////////////// ///////////////// first day of Month //////////////// ///////////////////////////////////////////////////// public int firstday( int Month, int year ) { int yeardiff, days_since, dayofyear[]={ 0,31,59,90,120,151,181,212,243,273,304,334 }; yeardiff = year - 1; days_since = yeardiff * 365; days_since += ( ( yeardiff/4 ) - ( yeardiff/100 ) + ((yeardiff)/400) ) + dayofyear[ Month ]; if (((((year % 4) == 0) && (((year % 100) != 0) || ((year % 400) == 0)))) && ( Month > 1 )) days_since++; return ( ( days_since + 1 ) % 7 ); } ///////////////////////////////////////////////////// ////////// Button and Mouse Activity /////////////// ///////////////////////////////////////////////////// public boolean action(Event event, Object arg ) { if (event.target instanceof Button ) HandleButtons(arg); repaint(); return true; } ///////////////////////////////////////////////////// /////////////////// Button Handler ////////////////// ///////////////////////////////////////////////////// protected void HandleButtons(Object label) { String NewYear; if ( label == "-100" ) year -= 100; else if ( label == "-10" ) year -= 10; else if ( label == "-1" ) year -= 1; else if ( label == "+1" ) year += 1; else if ( label == "+10" ) year += 10; else if ( label == "+100" ) year += 100; else if ( label == "Now" ) year = CurrentYear; NewYear = String.valueOf( year ); yearbox.setText( NewYear ); ///////////////////////////////////////////////////// ///////////// URL Link - Calendar History /////////// ///////////////////////////////////////////////////// if ( label == "About" ) { try { URL newman_networkcal = new URL( "http://web.wt.net/~newman/calendar/about_calendar.html" ); AppletContext context = getAppletContext(); context.showDocument( newman_networkcal ); } catch ( MalformedURLException e ) { //Nothing at this time. A good URL. } } ///////////////////////////////////////////////////// /////////// URL Link - Printable Calander /////////// ///////////////////////////////////////////////////// if ( label == "Print" ) { try { URL newman_networkcalp = new URL( "http://web.wt.net/~newman/calendar/printcal.html" ); AppletContext context = getAppletContext(); context.showDocument( newman_networkcalp ); } catch ( MalformedURLException e ) { //Nothing at this time. A good URL. } } ///////////////////////////////////////////////////// ////////////// Font and Background Color //////////// ///////////////////////////////////////////////////// if ( label == "FontColor" ) { FontIndex++; if ( FontIndex == 13 ) FontIndex = 0; } if ( label == "BackColor" ) { BackIndex++; if ( BackIndex == 13 ) BackIndex = 0; } } //handle buttons } // calendar class end