Java Tutorial/I18N/Calendar

Japanese Calendar

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.FontMetrics; import java.awt.Graphics; import java.awt.Insets; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.text.DateFormat; import java.text.DateFormatSymbols; import java.util.Calendar; import java.util.Date; import java.util.Locale; import javax.swing.BorderFactory; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class JapaneseCalendar extends JPanel {

 public JapaneseCalendar() {
   setLayout(new BorderLayout());
   final CalendarPane cp = new CalendarPane(Locale.JAPANESE);
   add(cp, BorderLayout.NORTH);
 }
 public static void main(String[] a) {
   JFrame f = new JFrame();
   f.add(new JapaneseCalendar());
   f.pack();
   f.setVisible(true);
 }

} class CalendarPane extends JPanel {

 final static Locale JAPAN_IMP_ERA = new Locale("ja", "JP", "JP");
 private Locale locale;
 CalendarPane(Locale initLocale) {
   setPreferredSize(new Dimension(400, 400));
   locale = initLocale;
 }
 public void paintComponent(Graphics g) {
   int width = 400;
   int height = 400;
   Calendar cal = Calendar.getInstance(locale);
   cal.setTime(new Date());
   String header = cal.getDisplayName(Calendar.MONTH, Calendar.LONG, locale);
   header += " " + cal.get(Calendar.YEAR);
   FontMetrics fm = g.getFontMetrics();
   Insets insets = getInsets();
   g.setColor(Color.black);
   g.drawString(header, (width - fm.stringWidth(header)) / 2, insets.top + fm.getHeight());
   DateFormatSymbols dfs = new DateFormatSymbols(locale);
   String[] weekdayNames = dfs.getShortWeekdays();
   int fieldWidth = (width - insets.left - insets.right) / 7;
   g.drawString(weekdayNames[Calendar.SUNDAY], insets.left
       + (fieldWidth - fm.stringWidth(weekdayNames[Calendar.SUNDAY])) / 2, insets.top + 3
       * fm.getHeight());
   g.drawString(weekdayNames[Calendar.MONDAY], insets.left + fieldWidth
       + (fieldWidth - fm.stringWidth(weekdayNames[Calendar.MONDAY])) / 2, insets.top + 3
       * fm.getHeight());
   g.drawString(weekdayNames[Calendar.TUESDAY], insets.left + 2 * fieldWidth
       + (fieldWidth - fm.stringWidth(weekdayNames[Calendar.TUESDAY])) / 2, insets.top + 3
       * fm.getHeight());
   g.drawString(weekdayNames[Calendar.WEDNESDAY], insets.left + 3 * fieldWidth
       + (fieldWidth - fm.stringWidth(weekdayNames[Calendar.WEDNESDAY])) / 2, insets.top + 3
       * fm.getHeight());
   g.drawString(weekdayNames[Calendar.THURSDAY], insets.left + 4 * fieldWidth
       + (fieldWidth - fm.stringWidth(weekdayNames[Calendar.THURSDAY])) / 2, insets.top + 3
       * fm.getHeight());
   g.drawString(weekdayNames[Calendar.FRIDAY], insets.left + 5 * fieldWidth
       + (fieldWidth - fm.stringWidth(weekdayNames[Calendar.FRIDAY])) / 2, insets.top + 3
       * fm.getHeight());
   g.drawString(weekdayNames[Calendar.SATURDAY], insets.left + 6 * fieldWidth
       + (fieldWidth - fm.stringWidth(weekdayNames[Calendar.SATURDAY])) / 2, insets.top + 3
       * fm.getHeight());
   int dom = cal.get(Calendar.DAY_OF_MONTH);
   cal.set(Calendar.DAY_OF_MONTH, 1);
   int col = 0;
   switch (cal.get(Calendar.DAY_OF_WEEK)) {
   case Calendar.MONDAY:
     col = 1;
     break;
   case Calendar.TUESDAY:
     col = 2;
     break;
   case Calendar.WEDNESDAY:
     col = 3;
     break;
   case Calendar.THURSDAY:
     col = 4;
     break;
   case Calendar.FRIDAY:
     col = 5;
     break;
   case Calendar.SATURDAY:
     col = 6;
   }
   cal.set(Calendar.DAY_OF_MONTH, dom);
   int row = 5 * fm.getHeight();
   for (int i = 1; i <= cal.getActualMaximum(Calendar.DAY_OF_MONTH); i++) {
     g.drawString("" + i, insets.left + fieldWidth * col + (fieldWidth - fm.stringWidth("" + i))
         / 2, row);
     if (++col > 6) {
       col = 0;
       row += fm.getHeight();
     }
   }
 }

}</source>