JavaSwing万年历+时间的程序（详细过程）

import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.util.Date;
import java.util.GregorianCalendar;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.Dimension;
public class Calender2 extends JFrame implements ActionListener, ItemListener
{

private static final long serialVersionUID = 1L;

public static void main(String args[])
{

try {
Calender2 frame = new Calender2();
frame.setVisible(true);
}

catch (Exception e)
{
e.printStackTrace();
}
}

private Date date = new Date();

private GregorianCalendar gregorianCalendar = new GregorianCalendar();

private String[] stringWeek = new String[] { "SUN", "MON", "TUE", "WED","THU", "FRI", "SAT" };

private String[] stringWeekCn = new String[] { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };

private String[] stringMonth = new String[] { "Jan", "Feb", "Mar", "Apr","May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec" };

private String[] strSysTime = new String[6];

private String[] strSysNowTime = new String[6];

private JButton[] buttonDay = new JButton[42];
private JButton[] buttonWeek = new JButton[7];
private JLabel labelMonth = new JLabel();
private JButton buttonToday = new JButton();
private JButton buttonLastMonth = new JButton();
private JButton buttonNextMonth = new JButton();
private JComboBox comboYear = new JComboBox();
private JComboBox comboMonth = new JComboBox();

public Calender2()
{

super("SONG");
getContentPane().setLayout(new GridLayout(9,7, 3, 5));
setBounds(300, 200,620, 430);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
comboYear.setForeground(new Color(200, 50, 255));
comboYear.setFont(new Font("", Font.PLAIN, 18));
for (int y = 1900; y < 3101; y++)
{
comboYear.addItem(" " + new Integer(y).toString());
}
getContentPane().add(comboYear);
comboYear.addItemListener(this);

final JLabel labelYear = new JLabel();
labelYear.setForeground(Color.BLUE);
labelYear.setFont(new Font(" ", Font.BOLD, 18));
getContentPane().add(labelYear);
labelYear.setText(" YEAR");

comboMonth.setForeground(new Color(150, 20, 255));
comboMonth.setFont(new Font(" ", Font.BOLD, 18));
for (int m =1; m <=12; m++)
{

comboMonth.addItem(" " + new Integer(m).toString());

}
getContentPane().add(comboMonth);
comboMonth.addItemListener(this);

getContentPane().add(labelMonth);
labelMonth.setForeground(Color.BLUE);
labelMonth.setFont(new Font(" ", Font.BOLD, 18));
labelMonth.setText(" MONTH");

getContentPane().add(buttonLastMonth);
buttonLastMonth.setForeground(Color.BLUE);
buttonLastMonth.setFont(new Font(" ", Font.BOLD, 16));
buttonLastMonth.setText("上月");
buttonLastMonth.addActionListener(this);

getContentPane().add(buttonToday);
buttonToday.setForeground(Color.BLUE);
buttonToday.setFont(new Font(" ", Font.BOLD, 16));
buttonToday.setText("今日");
buttonToday.addActionListener(this);

getContentPane().add(buttonNextMonth);
buttonNextMonth.setForeground(Color.BLUE);
buttonNextMonth.setFont(new Font(" ", Font.BOLD, 16));
buttonNextMonth.setText("下月");
buttonNextMonth.addActionListener(this);

for (int i = 0; i < 7; i++)
{
buttonWeek[i] = new JButton();
buttonWeek[i].setBackground(Color.YELLOW);

if (i == 0 || i == 6)
{
buttonWeek[i].setForeground(Color.RED);

}
else {
buttonWeek[i].setForeground(Color.BLUE);
}
buttonWeek[i].setFont(new Font(" ", Font.BOLD, 16));
buttonWeek[i].setText(stringWeekCn[i]);
getContentPane().add(buttonWeek[i]);
}

for (int i = 0; i < 42; i++)
{
buttonDay[i] = new JButton();
buttonDay[i].setText(" ");
buttonDay[i].setFont(new Font(" ", Font.BOLD, 28));
getContentPane().add(buttonDay[i]);
}
this.setResizable(false);
getSysNowTimeInfo();
setNowDate();
setNowDate();
//---------------------------------------------------------------------------------------
/* CLASS TIME */
final JLabel time = new JLabel();

time.add(new TIME(this));

getContentPane().add(time);

//----------------------------------------------------------------------------------------

}

public void setSysDate(int year, int month)
{

gregorianCalendar.set(year, month, 1);
}

public void actionPerformed(ActionEvent ae)
{
if (ae.getSource() == buttonToday)
{
setNowDate();
setNowDate();
}
else if (ae.getSource() == buttonLastMonth)
{
setDate(-1);
}
else { setDate(1);}

}

public void itemStateChanged(ItemEvent arg0)
{
setDate(0);
}

public void getSysNowTimeInfo()
{

date = gregorianCalendar.getTime();
strSysNowTime = (date + " ").split(" ");
}

public void getSysTimeInfo()
{

date = gregorianCalendar.getTime();
strSysTime = (date + " ").split(" ");
}

public int getNowMonth()
{
int month = 0;
for (int i = 0; i < 12; i++)
{
if (strSysNowTime[1].equalsIgnoreCase(stringMonth[i]))
{
month = i; break;

}
}

return month;

}

public int weekStrat(String strWeek)
{

int strat = 0;
for (int i = 0; i < 7; i++)
{
if (strWeek.equalsIgnoreCase(stringWeek[i]))
{
strat = i;break;

}
}

return strat;

}

public void setNowDate()
{

setSysTime(getNowYear(), getNowMonth());
getSysTimeInfo();
setDayNull();
getDay(getMonthDays(getNowYear(), getNowMonth() - 1), getMonthDays(getNowYear(), getNowMonth()), weekStrat(strSysTime[0]),getNowDay());
comboYear.setSelectedIndex(getNowYear() - 1900);
comboMonth.setSelectedIndex(getNowMonth());
}

public void setDate(int move)
{

setSysTime(getYear(), getMonth() + move);
getSysTimeInfo();
setDayNull();
getDay(getMonthDays(getYear(), getMonth() + move - 1), getMonthDays(getYear(), getMonth() + move), weekStrat(strSysTime[0]), -1);
if (move != 0)
{
if (getMonth() == 0 && move < 0)
{
move = 11;
comboYear.setSelectedIndex(getYear() - 1901);
}
else if (getMonth() == 11 && move > 0)
{
move = -11;
comboYear.setSelectedIndex(getYear() - 1899);
}
else
{
comboYear.setSelectedIndex(getYear() - 1900);
}

comboMonth.setSelectedIndex(getMonth() + move);
}
}

public void setSysTime(int year, int month)
{
gregorianCalendar.set(year, month, 1);
}

public int getNowYear()
{
return Integer.parseInt(strSysNowTime[5]);
}

public int getNowDay()
{
return Integer.parseInt(strSysNowTime[2]);
}

public int getYear()
{
return comboYear.getSelectedIndex() + 1900;
}

public int getMonth()
{
return comboMonth.getSelectedIndex();
}

public void setDayNull()
{
for (int d = 0; d < 42; d++)
{
buttonDay[d].setText(" ");
}
}

public void getDay(int lastMonDays, int monthDays, int startWeek, int day)
{

for (int d = 0; d < startWeek + 1; d++)
{
buttonDay[d].setForeground(Color.GRAY);
buttonDay[d].setText((lastMonDays - startWeek) + d + 1 + " ");
}
for (int d = startWeek; d < startWeek + monthDays; d++)
{
if ((d - startWeek + 1) == day)
{
buttonDay[d].setForeground(Color.blue);
buttonDay[d].setBackground(Color.GREEN);
buttonDay[d].setFont(new Font(" ", Font.BOLD, 36));

}
else if (d % 7 == 0 || d % 7 == 6)
{
buttonDay[d].setForeground(Color.RED);
}
else
{
buttonDay[d].setForeground(Color.BLACK);
}

buttonDay[d].setText(d - startWeek + 1 + " ");
}

for (int d = monthDays + startWeek; d < 42; d++)
{
buttonDay[d].setForeground(Color.GRAY);
buttonDay[d].setText(d - (monthDays + startWeek) + 1 + " ");
}

}

public int getMonthDays(int year, int month)
{

switch (month)
{
case 3:
case 5:
case 8:
case 10:
return 30;
case 1:
if (gregorianCalendar.isLeapYear(year))
{
return 29;
}
else
{
return 28;
}
default:
return 31;
}
}

}

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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 TIME extends Canvas implements Runnable
{

private static final long serialVersionUID = 3660124045489727166L;

Calender2 mf;

Thread t;

String time;

public TIME(Calender2 mf)
{

this.mf=mf;

setSize(620,60);

setBackground(Color.white);

t=new Thread(this);

t.start();

}

public void run()
{

while(true)
{

try {Thread.sleep(1000);}

catch(InterruptedException e)
{

System.out.println("error");

}

this.repaint(100);

}

}

public void paint(Graphics g)
{

Font f=new Font(" ",Font.BOLD,26);

SimpleDateFormat SDF=new SimpleDateFormat("yyyy'年'MM'月'dd'日'HH:mm:ss");

Calendar now=Calendar.getInstance();

time=SDF.format(now.getTime());

g.setFont(f);

g.setColor(Color.BLUE);

g.drawString(time,45,25);

}

}