怎样用java编写日历

import java.awt.BorderLayout;

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import java.awt.Color;

import java.awt.Dimension;

import java.awt.GridLayout;

import java.awt.SystemColor;

import java.awt.event.ActionEvent;

import java.awt.event.KeyEvent;

import java.awt.event.MouseEvent;

import java.util.Calendar;

import java.util.GregorianCalendar;

import java.util.Locale;

import java.util.Date;

import java.util.StringTokenizer;

import javax.swing.BorderFactory;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.JToggleButton;

import javax.swing.SwingConstants;

import javax.swing.UIManager;

/**

* pTitle: Swing日历/p

* pDescription: 操作日期/p

* @author duxu2004

* @version 1.0.1

*/

class JCalendar extends JPanel{

//动态表示年月日

private int year=0;

private int month=0;

private int day=0;

//主面板

private JPanel Main = new JPanel();

//日面板

private JPanel jPanelDay = new JPanel();

//月面板

private JPanel jPanelMonth = new JPanel();

//年的输入位置

private JTextField Year = new JTextField();

//月的输入位置

private JTextField Month = new JTextField();

//减少月份

private JButton MonthDown = new JButton();

//增加月份

private JButton MonthUp = new JButton();

private JPanel jPanelButton = new JPanel();

//减少年份

private JButton YearDown = new JButton();

//增加年份

private JButton YearUp = new JButton();

//显示日期的位置

private JLabel Out = new JLabel();

//中国时区，以后可以从这里扩展可以设置时区的功能

private Locale l=Locale.CHINESE;

//主日历

private GregorianCalendar cal=new GregorianCalendar(l);

//星期面板

private JPanel weekPanel=new JPanel();

//天按钮组

private JToggleButton[] days=new JToggleButton[42];

//天面板

private JPanel Days = new JPanel();

//标示

private JLabel jLabel1 = new JLabel();

private JLabel jLabel2 = new JLabel();

private JLabel jLabel3 = new JLabel();

private JLabel jLabel4 = new JLabel();

private JLabel jLabel5 = new JLabel();

private JLabel jLabel6 = new JLabel();

private JLabel jLabel7 = new JLabel();

//当前选择的天数按钮

private JToggleButton cur=null;

//月份天数数组，用来取得当月有多少天

// 1 2 3 4 5 6 7 8 9 10 11 12

private int[] mm={31,28,31,30,31,30,31,31,30,31,30,31};

//空日期构造函数

public JCalendar() {

try {

jbInit();

}

catch(Exception e) {

e.printStackTrace();

}

}

//带日期设置的构造函数

public JCalendar(int year, int month, int day) {

cal.set(year, month, day);

try {

jbInit();

}

catch (Exception e) {

e.printStackTrace();

}

}

//带日历输入的构造函数

public JCalendar(GregorianCalendar calendar) {

cal=calendar;

try {

jbInit();

}

catch (Exception e) {

e.printStackTrace();

}

}

//带日期输入的构造函数

public JCalendar(Date date) {

cal.setTime(date);

try {

jbInit();

}

catch (Exception e) {

e.printStackTrace();

}

}

//初始化组件

private void jbInit() throws Exception {

//初始化年、月、日

iniCalender();

this.setLayout(new BorderLayout());

this.setBorder(BorderFactory.createRaisedBevelBorder());

this.setMaximumSize(new Dimension(200, 200));

this.setMinimumSize(new Dimension(200, 200));

this.setPreferredSize(new Dimension(200, 200));

Main.setLayout(new BorderLayout());

Main.setBackground(SystemColor.info);

Main.setBorder(null);

Out.setBackground(Color.lightGray);

Out.setHorizontalAlignment(SwingConstants.CENTER);

Out.setMaximumSize(new Dimension(100, 19));

Out.setMinimumSize(new Dimension(100, 19));

Out.setPreferredSize(new Dimension(100, 19));

jLabel1.setForeground(Color.red);

jLabel1.setHorizontalAlignment(SwingConstants.CENTER);

jLabel1.setHorizontalTextPosition(SwingConstants.CENTER);

jLabel1.setText("日");

jLabel2.setForeground(Color.blue);

jLabel2.setHorizontalAlignment(SwingConstants.CENTER);

jLabel2.setHorizontalTextPosition(SwingConstants.CENTER);

jLabel2.setText("六");

jLabel3.setHorizontalAlignment(SwingConstants.CENTER);

jLabel3.setHorizontalTextPosition(SwingConstants.CENTER);

jLabel3.setText("五");

jLabel4.setHorizontalAlignment(SwingConstants.CENTER);

jLabel4.setHorizontalTextPosition(SwingConstants.CENTER);

jLabel4.setText("四");

jLabel5.setHorizontalAlignment(SwingConstants.CENTER);

jLabel5.setHorizontalTextPosition(SwingConstants.CENTER);

jLabel5.setText("三");

jLabel6.setBorder(null);

jLabel6.setHorizontalAlignment(SwingConstants.CENTER);

jLabel6.setHorizontalTextPosition(SwingConstants.CENTER);

jLabel6.setText("二");

jLabel7.setBackground(Color.lightGray);

jLabel7.setForeground(Color.black);

jLabel7.setBorder(null);

jLabel7.setHorizontalAlignment(SwingConstants.CENTER);

jLabel7.setHorizontalTextPosition(SwingConstants.CENTER);

jLabel7.setText("一");

weekPanel.setBackground(UIManager.getColor("InternalFrame.activeTitleGradient"));

weekPanel.setBorder(BorderFactory.createEtchedBorder());

weekPanel.setLayout(new GridLayout(1,7));

weekPanel.add(jLabel1, null);

weekPanel.add(jLabel7, null);

weekPanel.add(jLabel6, null);

weekPanel.add(jLabel5, null);

weekPanel.add(jLabel4, null);

weekPanel.add(jLabel3, null);

weekPanel.add(jLabel2, null);

MonthUp.setAlignmentX((float) 0.0);

MonthUp.setActionMap(null);

jPanelMonth.setBackground(SystemColor.info);

jPanelMonth.setLayout(new BorderLayout());

jPanelMonth.setBorder(BorderFactory.createEtchedBorder());

Month.setBorder(null);

Month.setHorizontalAlignment(SwingConstants.CENTER);

Month.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseClicked(MouseEvent e) {

Month_mouseClicked(e);

}

});

Month.addKeyListener(new java.awt.event.KeyAdapter() {

public void keyPressed(KeyEvent e) {

Month_keyPressed(e);

}

});

MonthDown.setBorder(null);

MonthDown.setText("\u25C4");

MonthDown.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(ActionEvent e) {

MonthDown_actionPerformed(e);

}

});

MonthUp.setBorder(null);

MonthUp.setText("\u25BA");

MonthUp.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(ActionEvent e) {

MonthUp_actionPerformed(e);

}

});

jPanelButton.setLayout(null);

jPanelButton.setBorder(null);

jPanelButton.addComponentListener(new java.awt.event.ComponentAdapter() {

public void componentResized(java.awt.event.ComponentEvent evt) {

jPanelButtonComponentResized(evt);

}

});

Year.setBorder(BorderFactory.createEtchedBorder());

Year.setMaximumSize(new Dimension(80, 25));

Year.setMinimumSize(new Dimension(80, 25));

Year.setPreferredSize(new Dimension(80, 25));

Year.setHorizontalAlignment(SwingConstants.CENTER);

Year.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseClicked(MouseEvent e) {

Year_mouseClicked(e);

}

});

Year.addKeyListener(new java.awt.event.KeyAdapter() {

public void keyPressed(KeyEvent e) {

Year_keyPressed(e);

}

});

YearDown.setBorder(null);

YearDown.setMaximumSize(new Dimension(16, 16));

YearDown.setMinimumSize(new Dimension(16, 16));

YearDown.setPreferredSize(new Dimension(16, 16));

YearDown.setSize(new Dimension(16, 16));

YearDown.setText("▼");

YearDown.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(ActionEvent e) {

YearDown_actionPerformed(e);

}

});

YearUp.setBorder(null);

YearUp.setMaximumSize(new Dimension(16, 16));

YearUp.setMinimumSize(new Dimension(16, 16));

YearUp.setPreferredSize(new Dimension(16, 16));

YearUp.setSize(new Dimension(16, 16));

YearUp.setText("▲");

YearUp.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(ActionEvent e) {

YearUp_actionPerformed(e);

}

});

jPanelDay.setLayout(new BorderLayout());

Days.setLayout(new GridLayout(6,7));

Days.setBackground(SystemColor.info);

for(int i=0;i42;i++){

days[i]=new JToggleButton();

days[i].setBorder(null);

days[i].setBackground(SystemColor.info);

days[i].setHorizontalAlignment(SwingConstants.CENTER);

days[i].setHorizontalTextPosition(SwingConstants.CENTER);

//days[i].setSize(l,l);

days[i].addActionListener(new java.awt.event.ActionListener(){

public void actionPerformed(ActionEvent e) {

day=Integer.parseInt(((JToggleButton)e.getSource()).getText());

showDate();

showDays();

}

});

Days.add(days[i]);

}

this.add(Main, BorderLayout.NORTH);

this.add(jPanelDay, BorderLayout.CENTER);

this.add(jPanelMonth, BorderLayout.SOUTH);

Main.add(Year, BorderLayout.CENTER);

Main.add(Out, BorderLayout.WEST);

Main.add(jPanelButton, BorderLayout.EAST);

jPanelButton.add(YearUp);

jPanelButton.add(YearDown);

jPanelDay.add(weekPanel,BorderLayout.NORTH);

jPanelDay.add(Days, BorderLayout.CENTER);

jPanelMonth.add(Month, BorderLayout.CENTER);

jPanelMonth.add(MonthDown, BorderLayout.WEST);

jPanelMonth.add(MonthUp, BorderLayout.EAST);

showMonth();

showYear();

showDate();

showDays();

}

//自定义重画年选择面板

void jPanelButtonComponentResized(java.awt.event.ComponentEvent evt){

YearUp.setLocation(0,0);

YearDown.setLocation(0,YearUp.getHeight());

jPanelButton.setSize(YearUp.getWidth(),YearUp.getHeight()*2);

jPanelButton.setPreferredSize(new Dimension(YearUp.getWidth(),YearUp.getHeight()*2));

jPanelButton.updateUI();

}

//测试用

public static void main(String[] args){

JFrame f=new JFrame();

f.setContentPane(new JCalendar());

f.pack();

//f.setResizable(false);

f.show();

}

//增加年份

void YearUp_actionPerformed(ActionEvent e) {

year++;

showYear();

showDate();

showDays();

}

//减少年份

void YearDown_actionPerformed(ActionEvent e) {

year--;

showYear();

showDate();

showDays();

}

//减少月份

void MonthDown_actionPerformed(ActionEvent e) {

month--;

if(month0) {

month = 11;

year--;

showYear();

}

showMonth();

showDate();

showDays();

}

//增加月份

void MonthUp_actionPerformed(ActionEvent e) {

month++;

if(month==12) {

month=0;

year++;

showYear();

}

showMonth();

showDate();

showDays();

}

//初始化年月日

void iniCalender(){

year=cal.get(Calendar.YEAR);

month=cal.get(Calendar.MONTH);

day=cal.get(Calendar.DAY_OF_MONTH);

}

//刷新月份

void showMonth(){

Month.setText(Integer.toString(month+1)+"月");

}

//刷新年份

void showYear(){

Year.setText(Integer.toString(year)+"年");

}

//刷新日期

void showDate(){

Out.setText(Integer.toString(year)+"-"+Integer.toString(month+1)+"-"+Integer.toString(day));

}

//重画天数选择面板

void showDays() {

cal.set(year,month,1);

int firstDayOfWeek = cal.get(Calendar.DAY_OF_WEEK);

int n=mm[month];

if(cal.isLeapYear(year)month==1) n++;

int i=0;

for(;ifirstDayOfWeek-1;i++){

days[i].setEnabled(false);

days[i].setSelected(false);

days[i].setText("");

}

int d=1;

for(;d=n;d++){

days[i].setText(Integer.toString(d));

days[i].setEnabled(true);

if(d==day) days[i].setSelected(true);

else days[i].setSelected(false);;

i++;

}

for(;i42;i++){

days[i].setEnabled(false);

days[i].setSelected(false);

days[i].setText("");

}

}

//单击年份面板选择整个年份字符串

void SelectionYear(){

Year.setSelectionStart(0);

Year.setSelectionEnd(Year.getText().length());

}

//单击月份面板选择整个月份字符串

void SelectionMonth(){

Month.setSelectionStart(0);

Month.setSelectionEnd(Month.getText().length());

}

//月份面板响应鼠标单击事件

void Month_mouseClicked(MouseEvent e) {

//SelectionMonth();

inputMonth();

}

//检验输入的月份

void inputMonth(){

String s;

if(Month.getText().endsWith("月"))

{

s=Month.getText().substring(0,Month.getText().length()-1);

}

else s=Month.getText();

month=Integer.parseInt(s)-1;

this.showMe();

}

//月份面板键盘敲击事件响应

void Month_keyPressed(KeyEvent e) {

if(e.getKeyChar()==10)

inputMonth();

}

//年份面板响应鼠标单击事件

void Year_mouseClicked(MouseEvent e) {

//SelectionYear();

inputYear();

}

//年份键盘敲击事件响应

void Year_keyPressed(KeyEvent e) {

//System.out.print(new Integer(e.getKeyChar()).byteValue());

if(e.getKeyChar()==10)

inputYear();

}

//检验输入的年份字符串

void inputYear() {

String s;

if(Year.getText().endsWith("年"))

{

s=Year.getText().substring(0,Year.getText().length()-1);

}

else s=Year.getText();

year=Integer.parseInt(s);

this.showMe();

}

//以字符串形式返回日期,yyyy-mm-dd

public String getDate(){return Out.getText();}

//以字符串形式输入日期,yyyy-mm-dd

public void setDate(String date){

if(date!=null){

StringTokenizer f = new StringTokenizer(date, "-");

if(f.hasMoreTokens())

year = Integer.parseInt(f.nextToken());

if(f.hasMoreTokens())

month = Integer.parseInt(f.nextToken());

if(f.hasMoreTokens())

day = Integer.parseInt(f.nextToken());

cal.set(year,month,day);

}

this.showMe();

}

//以日期对象形式输入日期

public void setTime(Date date){

cal.setTime(date);

this.iniCalender();

this.showMe();

}

//返回日期对象

public Date getTime(){return cal.getTime();}

//返回当前的日

public int getDay() {

return day;

}

//设置当前的日

public void setDay(int day) {

this.day = day;

cal.set(this.year,this.month,this.day);

this.showMe();

}

//设置当前的年

public void setYear(int year) {

this.year = year;

cal.set(this.year,this.month,this.day);

this.showMe();

}

//返回当前的年

public int getYear() {

return year;

}

//返回当前的月

public int getMonth() {

return month;

}

//设置当前的月

public void setMonth(int month) {

this.month = month;

cal.set(this.year,this.month,this.day);

this.showMe();

}

//刷新

public void showMe(){

this.showDays();

this.showMonth();

this.showYear();

this.showDate();

}

}

public class TestJCalendar {

public static void main(String[] args) {

JFrame f=new JFrame();

f.setContentPane(new JCalendar());

f.pack();

//f.setResizable(false);

f.show();

}

}

Java编写程序，输入年份，输出本年度各月份日历

写了个简明的，

import java.util.Calendar;

import java.util.Scanner;

public class Test {

static public void main(String 参数[]){

Calendar c = Calendar.getInstance();

Scanner sc = new Scanner(System.in);

System.out.println("请输入年份：");

int year= sc.nextInt();

c.set(Calendar.YEAR, year);

c.set(Calendar.MONTH, Calendar.JANUARY);

c.set(Calendar.DAY_OF_MONTH, 1);

while(c.get(Calendar.YEAR)==year){

int wday=c.get(Calendar.DAY_OF_WEEK);

int mday=c.get(Calendar.DAY_OF_MONTH);

if(mday==1){

System.out.println("\n日\t一\t二\t三\t四\t五\t六\t第"+(c.get(Calendar.MONTH)+1)+"月");

System.out.println("---------------------------------------------------");

for(int i=0;iwday-1;i++) System.out.print(" \t");

}

System.out.print(mday+"\t");

if(wday==7) System.out.println();

c.add(Calendar.DAY_OF_YEAR, 1);

}

}

}

=======

请输入年份：

2012

日 一 二 三 四 五 六 第1月

---------------------------------------------------

1 2 3 4 5 6 7

8 9 10 11 12 13 14

15 16 17 18 19 20 21

22 23 24 25 26 27 28

29 30 31

日 一 二 三 四 五 六 第2月

---------------------------------------------------

1 2 3 4

5 6 7 8 9 10 11

12 13 14 15 16 17 18

19 20 21 22 23 24 25

26 27 28 29

日 一 二 三 四 五 六 第3月

---------------------------------------------------

1 2 3

4 5 6 7 8 9 10

11 12 13 14 15 16 17

18 19 20 21 22 23 24

25 26 27 28 29 30 31

日 一 二 三 四 五 六 第4月

---------------------------------------------------

1 2 3 4 5 6 7

8 9 10 11 12 13 14

15 16 17 18 19 20 21

22 23 24 25 26 27 28

29 30

日 一 二 三 四 五 六 第5月

---------------------------------------------------

1 2 3 4 5

6 7 8 9 10 11 12

13 14 15 16 17 18 19

20 21 22 23 24 25 26

27 28 29 30 31

日 一 二 三 四 五 六 第6月

---------------------------------------------------

1 2

3 4 5 6 7 8 9

10 11 12 13 14 15 16

17 18 19 20 21 22 23

24 25 26 27 28 29 30

日 一 二 三 四 五 六 第7月

---------------------------------------------------

1 2 3 4 5 6 7

8 9 10 11 12 13 14

15 16 17 18 19 20 21

22 23 24 25 26 27 28

29 30 31

日 一 二 三 四 五 六 第8月

---------------------------------------------------

1 2 3 4

5 6 7 8 9 10 11

12 13 14 15 16 17 18

19 20 21 22 23 24 25

26 27 28 29 30 31

日 一 二 三 四 五 六 第9月

---------------------------------------------------

1

2 3 4 5 6 7 8

9 10 11 12 13 14 15

16 17 18 19 20 21 22

23 24 25 26 27 28 29

30

日 一 二 三 四 五 六 第10月

---------------------------------------------------

1 2 3 4 5 6

7 8 9 10 11 12 13

14 15 16 17 18 19 20

21 22 23 24 25 26 27

28 29 30 31

日 一 二 三 四 五 六 第11月

---------------------------------------------------

1 2 3

4 5 6 7 8 9 10

11 12 13 14 15 16 17

18 19 20 21 22 23 24

25 26 27 28 29 30

日 一 二 三 四 五 六 第12月

---------------------------------------------------

1

2 3 4 5 6 7 8

9 10 11 12 13 14 15

16 17 18 19 20 21 22

23 24 25 26 27 28 29

30 31

怎么用java写日历

以下是两个类，请楼主分别存成两个java文件:

其中

MainFrame.java是显示日历程序，Clock.java是日历计算程序。编译后运行MainFrame这个类即可。

1.MainFrame.java

---

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.GridLayout;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.sql.Date;

import java.util.Calendar;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

public class MainFrame extends JFrame {

/** *//**

*

*/

private static final long serialVersionUID = 1L;

JPanel panel = new JPanel(new BorderLayout());

JPanel panel1 = new JPanel();

JPanel panel2 = new JPanel(new GridLayout(7, 7));

JPanel panel3 = new JPanel();

JLabel[] label = new JLabel[49];

JLabel y_label = new JLabel("年份");

JLabel m_label = new JLabel("月份");

JComboBox com1 = new JComboBox();

JComboBox com2 = new JComboBox();

int re_year, re_month;

int x_size, y_size;

String year_num;

Calendar now = Calendar.getInstance(); // 实例化Calendar

MainFrame() {

super("万年历");

setSize(300, 350);

x_size = (int) (Toolkit.getDefaultToolkit().getScreenSize().getWidth());

y_size = (int) (Toolkit.getDefaultToolkit().getScreenSize().getHeight());

setLocation((x_size - 300) / 2, (y_size - 350) / 2);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

panel1.add(y_label);

panel1.add(com1);

panel1.add(m_label);

panel1.add(com2);

for (int i = 0; i 49; i++) {

label[i] = new JLabel("", JLabel.CENTER);// 将显示的字符设置为居中

panel2.add(label[i]);

}

panel3.add(new Clock(this));

panel.add(panel1, BorderLayout.NORTH);

panel.add(panel2, BorderLayout.CENTER);

panel.add(panel3, BorderLayout.SOUTH);

panel.setBackground(Color.white);

panel1.setBackground(Color.white);

panel2.setBackground(Color.white);

panel3.setBackground(Color.white);

Init();

com1.addActionListener(new ClockAction());

com2.addActionListener(new ClockAction());

setContentPane(panel);

setVisible(true);

setResizable(false);

}

class ClockAction implements ActionListener {

public void actionPerformed(ActionEvent arg0) {

int c_year, c_month, c_week;

c_year = Integer.parseInt(com1.getSelectedItem().toString()); // 得到当前所选年份

c_month = Integer.parseInt(com2.getSelectedItem().toString()) - 1; // 得到当前月份，并减1,计算机中的月为0－11

c_week = use(c_year, c_month); // 调用函数use，得到星期几

Resetday(c_week, c_year, c_month); // 调用函数Resetday

}

}

public void Init() {

int year, month_num, first_day_num;

String log[] = { "日", "一", "二", "三", "四", "五", "六" };

for (int i = 0; i 7; i++) {

label[i].setText(log[i]);

}

for (int i = 0; i 49; i = i + 7) {

label[i].setForeground(Color.red); // 将星期日的日期设置为红色

}

for (int i = 6; i 49; i = i + 7) {

label[i].setForeground(Color.green);// 将星期六的日期设置为绿色

}

for (int i = 1; i 10000; i++) {

com1.addItem("" + i);

}

for (int i = 1; i 13; i++) {

com2.addItem("" + i);

}

month_num = (int) (now.get(Calendar.MONTH)); // 得到当前时间的月份

year = (int) (now.get(Calendar.YEAR)); // 得到当前时间的年份

com1.setSelectedIndex(year - 1); // 设置下拉列表显示为当前年

com2.setSelectedIndex(month_num); // 设置下拉列表显示为当前月

first_day_num = use(year, month_num);

Resetday(first_day_num, year, month_num);

}

public int use(int reyear, int remonth) {

int week_num;

now.set(reyear, remonth, 1); // 设置时间为所要查询的年月的第一天

week_num = (int) (now.get(Calendar.DAY_OF_WEEK));// 得到第一天的星期

return week_num;

}

@SuppressWarnings("deprecation")

public void Resetday(int week_log, int year_log, int month_log) {

int month_day_score; // 存储月份的天数

int count;

month_day_score = 0;

count = 1;

Date date = new Date(year_log, month_log + 1, 1); // now

Calendar cal = Calendar.getInstance();

cal.setTime(date);

cal.add(Calendar.MONTH, -1); // 前个月

month_day_score = cal.getActualMaximum(Calendar.DAY_OF_MONTH);// 最后一天

for (int i = 7; i 49; i++) { // 初始化标签

label[i].setText("");

}

week_log = week_log + 6; // 将星期数加6，使显示正确

month_day_score = month_day_score + week_log;

for (int i = week_log; i month_day_score; i++, count++) {

label[i].setText(count + "");

}

}

public static void main(String[] args) {

JFrame.setDefaultLookAndFeelDecorated(true);

new MainFrame();

}

}

2.Clock.java

-----

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.GridLayout;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.sql.Date;

import java.util.Calendar;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

//显示时间的类：Clock

/** *//**

* Clock.java

* Summary 数字时间显示

* Created on

* @author

* remark

*/

import java.awt.Canvas;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.text.SimpleDateFormat;

import java.util.Calendar;

class Clock extends Canvas implements Runnable{

/** *//**

*

*/

private static final long serialVersionUID = 3660124045489727166L;

MainFrame mf;

Thread t;

String time;

public Clock(MainFrame mf){

this.mf=mf;

setSize(280,40);

setBackground(Color.white);

t=new Thread(this); //实例化线程

t.start(); //调用线程

}

public void run(){

while(true){

try{

Thread.sleep(1000); //休眠1秒钟

}catch(InterruptedException e){

System.out.println("异常");

}

this.repaint(100);

}

}

public void paint(Graphics g){

Font f=new Font("宋体",Font.BOLD,16);

SimpleDateFormat SDF=new SimpleDateFormat("yyyy'年'MM'月'dd'日'HH:mm:ss");//格式化时间显示类型

Calendar now=Calendar.getInstance();

time=SDF.format(now.getTime()); //得到当前日期和时间

g.setFont(f);

g.setColor(Color.orange);

g.drawString(time,45,25);

}

}

用java编程实现 2016年12月份的日历怎么写？

用Java实现的日历程序如下(图形界面程序)

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.Calendar;

import javax.swing.BorderFactory;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

public class CCI extends JFrame implements ActionListener{

JButton jb1=new JButton("");

JButton jb2=new JButton("");

JButton jb3=new JButton("");

JButton jb4=new JButton("");

JPanel jp1=new JPanel();

JPanel jp2=new JPanel();

JPanel jp3=new JPanel();

JPanel jp4=new JPanel();

JLabel jl1=new JLabel();

JLabel jl2=new JLabel();

JLabel[]jl=new JLabel[49];

String []week={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};

Calendar c=Calendar.getInstance();

int year,month,day;

int nowyear,nowmonth,nowday;

CCI(){

super("简单日历");

nowyear=c.get(Calendar.YEAR);

nowmonth=c.get(Calendar.MONTH)+1;

nowday=c.get(Calendar.DAY_OF_MONTH);

year=nowyear;

month=nowmonth;

day=nowday;

String s=year+"年"+month+"月";

jl1.setForeground(Color.RED);

jl1.setFont(new Font(null,Font.BOLD,20));

jl1.setText(s);

jb1.addActionListener(this);

jb2.addActionListener(this);

jb3.addActionListener(this);

jb4.addActionListener(this);

jp1.add(jb1);jp1.add(jb2);jp1.add(jl1);jp1.add(jb3);jp1.add(jb4);

jp2.setLayout(null);

createMonthPanel();

jp2.add(jp3);

jl2.setFont(new Font(null,Font.BOLD,20));

jl2.setText("今天是"+nowyear+"年"+nowmonth+"月"+nowday+"日");

jp4.add(jl2);

add(jp1,BorderLayout.NORTH);

add(jp2,BorderLayout.CENTER);

add(jp4,BorderLayout.SOUTH);

setSize(500,500);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setLocationRelativeTo(null);

setVisible(true);

}

@Override

public void actionPerformed(ActionEvent ae) {

if(ae.getSource()==jb1){

year=year-1;

String s=year+"年"+month+"月";

jl1.setText(s);

jp3.removeAll();

createMonthPanel();

jp3.validate();

}

if(ae.getSource()==jb2){

if(month==1){

year=year-1;

month=12;

}else{

month=month-1;

}

String s=year+"年"+month+"月";

jl1.setText(s);

jp3.removeAll();

createMonthPanel();

jp3.validate();

}

if(ae.getSource()==jb3){

if(month==12){

year=year+1;

month=1;

}else{

month=month+1;

}

String s=year+"年"+month+"月";

jl1.setText(s);

jp3.removeAll();

createMonthPanel();

jp3.validate();

}

if(ae.getSource()==jb4){

year=year+1;

String s=year+"年"+month+"月";

jl1.setText(s);

jp3.removeAll();

createMonthPanel();

jp3.validate();

}

}

public static void main(String[] args) {

new CCI();

}

public int getMonthDays(int year, int month) { 

switch (month) {

case 1: 

case 3: 

case 5: 

case 7:

case 8: 

case 10: 

case 12:

return 31; 

case 2: 

if ((year%4==0year%100!=0)||year%400==0) { 

return 29; 

} else { 

return 28; 

} 

default: 

return 30; 

} 

} 

public void createMonthPanel(){

c.set(year, month-1, getMonthDays(year,month));

int weekOfMonth=c.get(Calendar.WEEK_OF_MONTH);

if(weekOfMonth==6){

jp3.setLayout(new GridLayout(7,7));

jp3.setBounds(50, 20, 420, 350);

}else{

jp3.setLayout(new GridLayout(6,7));

jp3.setBounds(50, 20, 420, 300);

}

jp3.setBorder(BorderFactory.createEtchedBorder());

for(int i=0;i7;i++){

jl[i]=new JLabel(week[i],JLabel.CENTER);

jl[i].setFont(new Font(null,Font.BOLD,20));

jl[i].setBorder(BorderFactory.createEtchedBorder());

jp3.add(jl[i]);

}

c.set(year, month-1, 1);

int emptyFirst=c.get(Calendar.DAY_OF_WEEK)-1;

int daysOfMonth=getMonthDays(year,month);

for(int i=6+emptyFirst;i=7;i--){

int intyear=year;

int intmonth=month;

if(intmonth==1){

intyear=intyear-1;

intmonth=12;

}else{

intmonth=intmonth-1;

}

int intdays=getMonthDays(intyear,intmonth);

jl[i]=new JLabel((intdays+7-i)+"",JLabel.CENTER);

jl[i].setFont(new Font(null,Font.BOLD,20));

jl[i].setForeground(Color.GRAY);

jl[i].setBorder(BorderFactory.createEtchedBorder());

jp3.add(jl[i]);

}

for(int i=7+emptyFirst;idaysOfMonth+7+emptyFirst;i++){

jl[i]=new JLabel((i-7-emptyFirst+1)+"",JLabel.CENTER);

jl[i].setFont(new Font(null,Font.BOLD,20));

if((i+1)%7==0 || (i+1)%7==1){

jl[i].setForeground(Color.RED);

}else if((i-7-emptyFirst+1)==nowdaymonth==nowmonthyear==nowyear)

jl[i].setForeground(Color.BLUE);

else

jl[i].setForeground(Color.BLACK);

jl[i].setBorder(BorderFactory.createEtchedBorder());

jp3.add(jl[i]);

}

if(weekOfMonth==6)

for(int i=48;i=daysOfMonth+emptyFirst+7;i--){

jl[i]=new JLabel((49-i)+"",JLabel.CENTER);

jl[i].setFont(new Font(null,Font.BOLD,20));

jl[i].setForeground(Color.GRAY);

jl[i].setBorder(BorderFactory.createEtchedBorder());

jp3.add(jl[i]);

}

else

for(int i=41;i=daysOfMonth+emptyFirst+7;i--){

jl[i]=new JLabel((42-i)+"",JLabel.CENTER);

jl[i].setFont(new Font(null,Font.BOLD,20));

jl[i].setForeground(Color.GRAY);

jl[i].setBorder(BorderFactory.createEtchedBorder());

jp3.add(jl[i]);

}

}

}

运行结果

新闻标题：java简单日历程序代码 java中日历类
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