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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();
}
}
}
}
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