//  一個(gè)日歷程序基本每一行都帶有注釋!(改進(jìn)版）！！！！ 
//CalenderTrain.java 

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import java.util.*; 

public class CalenderTrain extends JFrame implements ActionListener { 
JComboBox Month = new JComboBox(); //月份下拉列表框 
JComboBox Year = new JComboBox(); //年份下拉列表框 
JLabel Year_l = new JLabel("Year::"); //定義標(biāo)簽 
JLabel Month_l = new JLabel("Month::"); //定義標(biāo)簽 
Date now_date = new Date(); //獲取今天的日期 
JButton[] button_day = new JButton[49]; //定義一個(gè)數(shù)組用來(lái)存放日期 
JButton button_ok = new JButton("確定"); //現(xiàn)實(shí)選擇日期 
JButton button_today = new JButton("今天"); //顯示今天按鈕 
int now_year = now_date.getYear() + 1900; //獲取年份值 
int now_month = now_date.getMonth(); //獲取月份值(當(dāng)前月份-1) 
boolean bool = false; 
String year_int = null; //存放年份 
int month_int; //存放月份 
JPanel pane_ym = new JPanel(); //放置下拉列表框和控制按鈕面板 
JPanel pane_day = new JPanel(); //放置日期面板 
JPanel pane_parent = new JPanel(); //放置以上兩個(gè)面板 
//定義方法繪制面板 
public CalenderTrain() { 
super("Calender!"); //設(shè)定面板得title 
//---以下幾行使得關(guān)閉面板時(shí)退出程序 
setDefaultCloseOperation(DISPOSE_ON_CLOSE); 
addWindowListener(new WindowAdapter() { 
public void windowClose(WindowEvent e) { 
System.exit(0); 
} 
}); 
//--- 
setResizable(false); //面板的大小不能變化 
//設(shè)定年月 
/*年份的區(qū)間是當(dāng)前年份的過(guò)去10年到當(dāng)前年份的未來(lái)20年 
* 月份正常1??12月 
*/ 
for (int i = now_year - 10; i <= now_year + 20; i++) { 
Year.addItem(i + ""); 
} 
for (int i = 1; i < 13; i++) { 
Month.addItem(i + ""); 
} 
Year.setSelectedIndex(10); //設(shè)定年份下拉列表為當(dāng)前年份 
pane_ym.add(Year_l); //添加年份標(biāo)簽 
pane_ym.add(Year); //添加年份下拉列表框 
Month.setSelectedIndex(now_month); //設(shè)定月份下拉列表為當(dāng)前月份 
pane_ym.add(Month_l); //添加月份標(biāo)簽 
pane_ym.add(Month); //添加月份下拉列表框 
pane_ym.add(button_ok); //添加確定按鈕 
pane_ym.add(button_today); //添加“今天”按鈕 
button_ok.addActionListener(this); //確定按鈕添加監(jiān)聽(tīng)事件 
button_today.addActionListener(this); //“今天”按鈕添加監(jiān)聽(tīng)事件 
//年月設(shè)定結(jié)束 
//初始化日期按鈕并繪制 
pane_day.setLayout(new GridLayout(7, 7, 10, 10)); 
for (int i = 0; i < 49; i++) { 
button_day[i] = new JButton(" "); 
pane_day.add(button_day[i]); 
} 
this.setDay(); //調(diào)用setDay()方法 
pane_parent.setLayout(new BorderLayout()); //設(shè)定布局管理器 
setContentPane(pane_day); 
setContentPane(pane_ym); 
pane_parent.add(pane_day, BorderLayout.SOUTH); 
pane_parent.add(pane_ym, BorderLayout.NORTH); 
setContentPane(pane_parent); 
pack(); 
show(); 
} 
void setDay() { 
if (bool) { 
year_int = now_year + ""; 
month_int = now_month; 
} else { 
year_int = Year.getSelectedItem().toString(); 
month_int = Month.getSelectedIndex(); 
} 

int year_sel = Integer.parseInt(year_int) - 1900; //獲得年份值 
Date dt = new Date(year_sel, month_int, 1); //構(gòu)造一個(gè)日期 
GregorianCalendar cal = new GregorianCalendar(); //創(chuàng)建一個(gè)Calendar實(shí)例 
cal.setTime(dt); 
String week[] = { "Sun", "Mon", "Tue", "Wed", "Thur", "Fri", "Sat" }; 
int day = 0; //day中存放某個(gè)月份的天數(shù) 
int day_week = 0; //用來(lái)存放某個(gè)月的第一天是星期幾的數(shù)值 
//--將星期添加到前7個(gè)按鈕中 
for (int i = 0; i < 7; i++) { 
button_day[i].setText(week[i]); 
} 
//-- 
/*判斷是幾月份,根據(jù)它來(lái)設(shè)定day的值 
* 其中二月份要判斷是否是閏年 
*/ 
if (month_int == 0 
|| month_int == 2 
|| month_int == 4 
|| month_int == 6 
|| month_int == 7 
|| month_int == 9 
|| month_int == 11) { 
day = 31; 
} else if ( 
month_int == 3 
|| month_int == 5 
|| month_int == 8 
|| month_int == 10) { 
day = 30; 
} else { 
if (cal.isLeapYear(year_sel)) { 
day = 29; 
} else { 
day = 28; 
} 
} 
day_week = 7 + dt.getDay(); 
int count = 1; 
/*繪制按鈕 
* 在這里我們首先要根據(jù)選定的月份的第一天是星期幾來(lái)確定我們繪制按鈕的起始位置 
* 其中day_week就是我們要繪制的起始位置 
* 對(duì)于那些沒(méi)有數(shù)值可以顯示的按鈕要置空 
*/ 
for (int i = day_week; i < day_week + day; count++, i++) { 
if (i % 7 == 0 
|| i == 13 
|| i == 20 
|| i == 27 
|| i == 48 
|| i == 34 
|| i == 41) { 
if (i == day_week + now_date.getDate() - 1) { 
button_day[i].setForeground(Color.BLUE); 
button_day[i].setText(count + ""); 
} else { 
button_day[i].setForeground(Color.RED); 
button_day[i].setText(count + ""); 
} 

} else { 
if (i == day_week + now_date.getDate() - 1) { 
button_day[i].setForeground(Color.BLUE); 
button_day[i].setText(count + ""); 
} else { 
button_day[i].setForeground(Color.BLACK); 
button_day[i].setText(count + ""); 
} 
} 
} 
//--對(duì)于沒(méi)有日期數(shù)值顯示的按鈕進(jìn)行置空處理 
if (day_week == 0) { 
for (int i = day; i < 49; i++) { 
button_day[i].setText(" "); 
} 
} else { 
//第一天前面的按鈕置空 
for (int i = 7; i < day_week; i++) { 
button_day[i].setText(" "); 
} //最后一天后面的按鈕置空 
for (int i = day_week + day; i < 49; i++) { 
button_day[i].setText(" "); 
} 
} 
} 
public void actionPerformed(ActionEvent e) { 
if (e.getSource() == button_ok) { 
bool = false; 
this.setDay(); //如果點(diǎn)擊確定按鈕就調(diào)用setDay()重新方法繪制按鈕 

} else if (e.getSource() == button_today) { 
bool = true; 
Year.setSelectedIndex(10); 
Month.setSelectedIndex(now_month); 
this.setDay(); //如果點(diǎn)擊今天按鈕，得到今天的日期 

} 
} 
public static void main(String[] args) { 
CalenderTrain ct = new CalenderTrain(); 
} 
}