import java.awt.*; import java.awt.event.*; import java.util.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.table.*; public class MyCalendar extends JApplet {     //定義常量  日期常量    public static final String WEEK_SUN = "SUN"; //星期日    public static final String WEEK_MON = "MON"; //星期一    public static final String WEEK_TUE = "TUE"; //星期二    public static final String WEEK_WED = "WED"; //星期三    public static final String WEEK_THU = "THU"; //星期四    public static final String WEEK_FRI = "FRI"; //星期五    public static final String WEEK_SAT = "SAT"; //星期六  	//顏色常量    public static final Color background = Color.white;     public static final Color foreground = Color.black;     public static final Color headerBackground = Color.blue;     public static final Color headerForeground = Color.white;     public static final Color selectedBackground = Color.blue;     public static final Color selectedForeground = Color.red;     private JPanel cPane; //主窗口    private JLabel yearsLabel;   //年份標簽    private JSpinner yearsSpinner; //年份輸入筐    private JLabel monthsLabel;   //月份標簽    private JComboBox monthsComboBox; //月份選擇筐    private JTable daysTable;   //設設置顯示日期表格    private AbstractTableModel daysModel;     private Calendar calendar;         //構造函數    public MyCalendar() {         cPane = (JPanel) getContentPane();     }     //初試化程序    public void init() {     	//設置布局管理器        cPane.setLayout(new BorderLayout());         calendar = Calendar.getInstance();         calendar = Calendar.getInstance();        //初試畫LABEL        yearsLabel = new JLabel("Year: ");         yearsSpinner = new JSpinner();         //初試畫輸入        yearsSpinner.setEditor(new JSpinner.NumberEditor(yearsSpinner, "0000"));        yearsSpinner.setValue(new Integer(calendar.get(Calendar.YEAR)));         yearsSpinner.addChangeListener(new ChangeListener() {                 public void stateChanged(ChangeEvent changeEvent) {                     int day = calendar.get(Calendar.DAY_OF_MONTH);                    calendar.set(Calendar.DAY_OF_MONTH, 1);                    calendar.set(Calendar.YEAR, ((Integer) yearsSpinner.getValue()).intValue());                    int maxDay = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);                    calendar.set(Calendar.DAY_OF_MONTH, day > maxDay ? maxDay : day);                    updateView();                 }             });         //添加組鍵入窗口        JPanel yearMonthPanel = new JPanel();         cPane.add(yearMonthPanel, BorderLayout.NORTH);         yearMonthPanel.setLayout(new BorderLayout());         yearMonthPanel.add(new JPanel(), BorderLayout.CENTER);         JPanel yearPanel = new JPanel();         yearMonthPanel.add(yearPanel, BorderLayout.WEST);         yearPanel.setLayout(new BorderLayout());         yearPanel.add(yearsLabel, BorderLayout.WEST);         yearPanel.add(yearsSpinner, BorderLayout.CENTER);        //設置月份        monthsLabel = new JLabel("Month: ");         monthsComboBox = new JComboBox();         for (int i = 1; i <= 12; i++) {             monthsComboBox.addItem(new Integer(i));         }         monthsComboBox.setSelectedIndex(calendar.get(Calendar.MONTH));         monthsComboBox.addActionListener(new ActionListener() {                 public void actionPerformed(ActionEvent actionEvent) {                    int day = calendar.get(Calendar.DAY_OF_MONTH);                    calendar.set(Calendar.DAY_OF_MONTH, 1);                    calendar.set(Calendar.MONTH, monthsComboBox.getSelectedIndex());                    int maxDay = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);                    calendar.set(Calendar.DAY_OF_MONTH, day > maxDay ? maxDay : day);                    updateView();                 }             });         JPanel monthPanel = new JPanel();         yearMonthPanel.add(monthPanel, BorderLayout.EAST);         monthPanel.setLayout(new BorderLayout());         monthPanel.add(monthsLabel, BorderLayout.WEST);         monthPanel.add(monthsComboBox, BorderLayout.CENTER);         daysModel = new AbstractTableModel() { //設置日期                public int getRowCount() {                     return 7;                 }                 public int getColumnCount() {                     return 7;                 }                 public Object getValueAt(int row, int column) {                     if (row == 0) {                         return getHeader(column);                     }                     row--;                     Calendar calendar = (Calendar) MyCalendar.this.calendar.clone();                    calendar.set(Calendar.DAY_OF_MONTH, 1);                    int dayCount = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);                     int moreDayCount = calendar.get(Calendar.DAY_OF_WEEK) - 1;                     int index = row * 7 + column;                     int dayIndex = index - moreDayCount + 1;                    if (index < moreDayCount || dayIndex > dayCount) {                         return null;                     } else {                         return new Integer(dayIndex);                     }                 }             };        //設置TABLE布局        daysTable = new CalendarTable(daysModel, calendar);         daysTable.setCellSelectionEnabled(true);        daysTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);         daysTable.setDefaultRenderer(daysTable.getColumnClass(0), new TableCellRenderer() {                 public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,                                                                boolean hasFocus, int row, int column) {                     String text = (value == null) ? "" : value.toString();                     JLabel cell = new JLabel(text);                     cell.setOpaque(true);                     if (row == 0) {                         cell.setForeground(headerForeground);                         cell.setBackground(headerBackground);                     } else {                         if (isSelected) {                             cell.setForeground(selectedForeground);                             cell.setBackground(selectedBackground);                         } else {                             cell.setForeground(foreground);                             cell.setBackground(background);                         }                     }                     return cell;                 }             });        updateView();         cPane.add(daysTable, BorderLayout.CENTER);     }     public static String getHeader(int index) {         switch (index) {         case 0:             return WEEK_SUN;         case 1:             return WEEK_MON;         case 2:             return WEEK_TUE;         case 3:             return WEEK_WED;         case 4:             return WEEK_THU;         case 5:             return WEEK_FRI;         case 6:             return WEEK_SAT;         default:             return null;         }     }     public void updateView() {         daysModel.fireTableDataChanged();        daysTable.setRowSelectionInterval(calendar.get(Calendar.WEEK_OF_MONTH),                                          calendar.get(Calendar.WEEK_OF_MONTH));        daysTable.setColumnSelectionInterval(calendar.get(Calendar.DAY_OF_WEEK) - 1,                                             calendar.get(Calendar.DAY_OF_WEEK) - 1);    }    public static class CalendarTable extends JTable {        private Calendar calendar;        public CalendarTable(TableModel model, Calendar calendar) {            super(model);            this.calendar = calendar;        }        public void changeSelection(int row, int column, boolean toggle, boolean extend) {            super.changeSelection(row, column, toggle, extend);            if (row == 0) {                return;            }            Object obj = getValueAt(row, column);            if (obj != null) {                calendar.set(Calendar.DAY_OF_MONTH, ((Integer)obj).intValue());            }        }    }     //主函數    public static void main(String[] args) {         JFrame frame = new JFrame("Calendar Application");        //設置窗口關閉按鈕         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         MyCalendar myCalendar = new MyCalendar();         myCalendar.init();         frame.getContentPane().add(myCalendar);         //設置窗口大小        frame.setSize(240, 172);         //設置窗口可見        frame.show();     } }