Mega Code Archive
The Calendar program
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import java.awt.Color;
import java.awt.Container;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.AbstractTableModel;
public class Calendar extends JFrame {
String[] years = { "2008", "2009", "2010" };
JComboBox comboBox = new JComboBox(years);
String[] months = { "January", "February", "March", "April", "May", "June", "July", "August",
"September", "October", "November", "December" };
JList list = new JList(months);
JScrollPane scrollPane = new JScrollPane(list);
CalendarModel model = new CalendarModel();
JTable table = new JTable(model);
public Calendar() {
super();
getContentPane().setLayout(null);
comboBox.setBounds(10, 10, 100, 30);
comboBox.setSelectedIndex(0);
comboBox.addItemListener(new ComboHandler());
scrollPane.setBounds(200, 10, 150, 100);
list.setSelectedIndex(3);
list.addListSelectionListener(new ListHandler());
table.setBounds(10, 150, 550, 200);
model.setMonth(comboBox.getSelectedIndex() + 1998, list.getSelectedIndex());
getContentPane().add(comboBox);
getContentPane().add(scrollPane);
table.setGridColor(Color.black);
table.setShowGrid(true);
getContentPane().add(table);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(500, 500);
setVisible(true);
}
public static void main(String[] args) {
Calendar app = new Calendar();
}
public class ComboHandler implements ItemListener {
public void itemStateChanged(ItemEvent e) {
model.setMonth(comboBox.getSelectedIndex() + 1998, list.getSelectedIndex());
table.repaint();
}
}
public class ListHandler implements ListSelectionListener {
public void valueChanged(ListSelectionEvent e) {
model.setMonth(comboBox.getSelectedIndex() + 1998, list.getSelectedIndex());
table.repaint();
}
}
}
class CalendarModel extends AbstractTableModel {
String[] days = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
int[] numDays = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
String[][] calendar = new String[7][7];
public CalendarModel() {
for (int i = 0; i < days.length; ++i)
calendar[0][i] = days[i];
for (int i = 1; i < 7; ++i)
for (int j = 0; j < 7; ++j)
calendar[i][j] = " ";
}
public int getRowCount() {
return 7;
}
public int getColumnCount() {
return 7;
}
public Object getValueAt(int row, int column) {
return calendar[row][column];
}
public void setValueAt(Object value, int row, int column) {
calendar[row][column] = (String) value;
}
public void setMonth(int year, int month) {
for (int i = 1; i < 7; ++i)
for (int j = 0; j < 7; ++j)
calendar[i][j] = " ";
java.util.GregorianCalendar cal = new java.util.GregorianCalendar();
cal.set(year, month, 1);
int offset = cal.get(java.util.GregorianCalendar.DAY_OF_WEEK) - 1;
offset += 7;
int num = daysInMonth(year, month);
for (int i = 0; i < num; ++i) {
calendar[offset / 7][offset % 7] = Integer.toString(i + 1);
++offset;
}
}
public boolean isLeapYear(int year) {
if (year % 4 == 0)
return true;
return false;
}
public int daysInMonth(int year, int month) {
int days = numDays[month];
if (month == 1 && isLeapYear(year))
++days;
return days;
}
}
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