一個簡單的JAVA日歷程序

/**以下是日歷的代碼程序
有疑問 回信 [email protected]
**/
//CalenderTrain.java
package com.swing;
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::"); //定義標簽
JLabel Month_l = new JLabel("Month::"); //定義標簽
Date now_date = new Date(); //獲取今天的日期
JButton[] button_day = new JButton[49]; //定義一個數組用來存放日期
JButton button_ok = new JButton("確定"); //現實選擇日期
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(); //放置以上兩個面板
//定義方法繪制面板
public CalenderTrain() {
super("Calender!"); //設定面板得title
//---以下幾行使得關閉面板時退出程序
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
addWindowListener(new WindowAdapter() {
public void windowClose(WindowEvent e) {
System.out.print("CLOSING THE WIN");
System.exit(0);
}
});
//---
setResizable(false); //面板的大小不能變化
//設定年月
/*年份的區間是當前年份的過去10年到當前年份的未來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); //設定年份下拉列表為當前年份
pane_ym.add(Year_l); //添加年份標簽
pane_ym.add(Year); //添加年份下拉列表框
Month.setSelectedIndex(now_month); //設定月份下拉列表為當前月份
pane_ym.add(Month_l); //添加月份標簽
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); //確定按鈕添加監聽事件
button_today.addActionListener(this); //“今天”按鈕添加監聽事件
//年月設定結束
//初始化日期按鈕並繪制
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(); //調用setDay()方法
pane_parent.setLayout(new BorderLayout()); //設定布局管理器
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); //構造一個日期
GregorianCalendar cal = new GregorianCalendar(); //創建一個Calendar實例
cal.setTime(dt);
String week[] = { "Sun", "Mon", "Tue", "Wed", "Thur", "Fri", "Sat" };
int day = 0; //day中存放某個月份的天數
int day_week = 0; //用來存放某個月的第一天是星期幾的數值
//--將星期添加到前7個按鈕中
for (int i = 0; i < 7; i++) {
button_day[i].setText(week[i]);
}
//--
/*判斷是幾月份,根據它來設定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
* 在這裡我們首先要根據選定的月份的第一天是星期幾來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
* 對於那些沒有數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 + "");
}
}
}
//--對於沒有日期數值顯示的按鈕進行置空處理
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(" ");
} //最後一天後面的按鈕置空
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(); //如果點擊確定按鈕就調用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(); //如果點擊今天按鈕，得到今天的日期
}
}
public static void main(String[] args) {
CalenderTrain ct = new CalenderTrain();
}
}