Question

你回答的：“编写JAVA程序实现一个简单的日历”这个问题，能不能在代码中加入一些解释呀，谢了！！

万分感谢！！！由于我的账号刚创的，所以财富少，所以悬赏少点请不要见怪哦……
是这个代码，因为不能超过500字所以没能把你发的全部显示在这里
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 {

public static final String WEEK_SUN = "SUN";
public static final String WEEK_MON = "MON";
public static final String WEEK_TUE = "TUE";
public static final String WEEK_WED = "WED";
public static final String WEEK_THU = "THU";
public static final String WEEK_FRI = "FRI";
public static final String WEEK_SAT = "SAT";

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.white;

Answer 1

*FileCalendarBean.java
*author:***
*Date:2007-12-823:37
*返回某年某月的日历的字符串数组
*/
importjava.util.Calendar;
publicclassCalendarBean...{
intyear=2007,month=0;
privateintmonthDays[]=...{31,28,31,30,31,30,31,31,30,31,30,31};

//设置年份
publicvoidsetYear(intyear)...{
this.year=year;
}

//获取年份
publicintgetYear()...{
returnyear;
}

//设置月份
publicvoidsetMonth(intmonth)...{
this.month=month>0?month:1;
}

//获取月份
publicintgetMonth()...{
returnmonth;
}

//判断是否为闰年
privatestaticbooleanisLeap(intyear)...{
return((year%4==0)&&(year%100==0))||(year%400==0);
}

//获得当前年月的日历所组成字符串数组
publicString[][]getCalendar()...{
Stringdata[][]=newString[6][7];

Calendarcale=Calendar.getInstance();
cale.set(year,month-1,1);

//该月1号是星期几
intweekDay=cale.get(Calendar.DAY_OF_WEEK)-1;

//该月的天数
intday=monthDays[month-1];
if(month==2&&isLeap(year))day=29;

intnextDay=1;

//添加字符串数组
for(intk=0;k<6;k++)...{
if(k==0)
for(intj=weekDay;j<7;j++)...{
data[k][j]=""+nextDay;
nextDay++;
}
else
for(intj=0;j<7&&nextDay<=day;j++)...{
data[k][j]=""+nextDay;
nextDay++;
}
}
returndata;
}

}

/**//*FileCalenderFrame.java
*author:***
*Date:2007-12-823:37
*一个简单的日历
*/
importjavax.swing.*;
importjavax.swing.tree.*;
importjava.awt.*;
importjava.awt.event.*;
importjavax.swing.event.*;

publicclassCalenderFrameextendsJFrameimplementsItemListener,TreeSelectionListener...{
JTabletable;
JTreetree=null;
DefaultMutableTreeNoderoot;
Objectname[]=...{"星期日","星期一","星期二","星期三","星期四","星期五","星期六"};
JComboBoxyearList;
CalendarBeancale;
Stringrili[][];
Stringitem[]=...{"2006","2007","2008","2009","2010"};
JSplitPanesplit;
intyear=2006;
intmonth=0;
JScrollPanescrollTree,scrollTable;

publicCalenderFrame()...{
cale=newCalendarBean();

//添加年份列表
yearList=newJComboBox();
for(intk=0;k<item.length;k++)
yearList.addItem(item[k]);
yearList.addItemListener(this);

//添加月份树
root=newDefaultMutableTreeNode(item[0]);
tree=newJTree(root);
add(newJScrollPane(tree),BorderLayout.WEST);
tree.addTreeSelectionListener(this);

//设置年月及该月日历
cale.setYear(year);
cale.setMonth(month);
rili=cale.getCalendar();
table=newJTable(rili,name);

//添加到窗口
scrollTree=newJScrollPane(tree);
scrollTable=newJScrollPane(table);
split=newJSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,scrollTree,scrollTable);
add(yearList,BorderLayout.NORTH);
add(split,BorderLayout.CENTER);
updateYear(year);

//设置窗口属性
setSize(580,350);
setVisible(true);
split.setDividerLocation(0.5);
validate();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

//更新年份及月份树
privatevoidupdateYear(intyear)...{
cale.setYear(year);
root=newDefaultMutableTreeNode(String.valueOf(year));

DefaultMutableTreeNodemonths[]=newDefaultMutableTreeNode[13];
for(inti=0;i<12;i++)...{
months[i]=newDefaultMutableTreeNode(""+(i+1));
root.add(months[i]);
}
split.remove(scrollTree);
tree=newJTree(root);
tree.addTreeSelectionListener(this);
scrollTree=newJScrollPane(tree);
split.add(scrollTree,JSplitPane.LEFT);
split.setDividerLocation(0.5);
validate();
}

//年份列表的监听器
publicvoiditemStateChanged(ItemEvente)...{
StringyearStr=yearList.getSelectedItem().toString().trim();
intyear=Integer.parseInt(yearStr);

updateYear(year);
}

//树结点的监听器
publicvoidvalueChanged(TreeSelectionEvente)...{
DefaultMutableTreeNodemonthNode=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
if(monthNode.isLeaf())...{
month=Integer.parseInt(monthNode.toString().trim());
cale.setMonth(month);
rili=cale.getCalendar();
split.remove(scrollTable);
table=newJTable(rili,name);
scrollTable=newJScrollPane(table);
split.add(scrollTable,JSplitPane.RIGHT);
split.setDividerLocation(0.5);
validate();
System.out.println("validateok");
}

}

publicstaticvoidmain(Stringargs[])...{
newCalenderFrame();
}
}

Answer 2

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 {

public static final String WEEK_SUN = "SUN";
public static final String WEEK_MON = "MON";
public static final String WEEK_TUE = "TUE";
public static final String WEEK_WED = "WED";
public static final String WEEK_THU = "THU";
public static final String WEEK_FRI = "FRI";
public static final String WEEK_SAT = "SAT";

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.white;

private JPanel cPane;
private JLabel yearsLabel;
private JSpinner yearsSpinner;
private JLabel monthsLabel;
private JComboBox monthsComboBox;
private JTable daysTable;
private AbstractTableModel daysModel;
private Calendar calendar;

public MyCalendar() {
cPane = (JPanel) getContentPane();
}

public void init() {
cPane.setLayout(new BorderLayout());

calendar = Calendar.getInstance();
calendar = Calendar.getInstance();
yearsLabel = new JLabel("Year: ");
yearsSpinner = new JSpinner();
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();
}
});

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);

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() {
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);
}
}
};

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());
}
}
}

public static void main(String[] args) {
JFrame frame = new JFrame("Calendar Application");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MyCalendar myCalendar = new MyCalendar();
myCalendar.init();
frame.getContentPane().add(myCalendar);
frame.setSize(240, 172);
frame.show();
}

}