java 万年历 程序
【实验要求】编写一个程序，有一个窗口，该窗口为BorderLayout布局。窗口的中心添加一个Panel容器：pCenter，pCenter的布局是7行7列的GridLayout布局，pCenter的中放置49个标签，用来显示日历。窗口北面添加一个Panel容器pNorth，其布局是FlowLayout布局，pNorth放置两个按钮：nextMonth和previousMonth按钮，单击nextMonth,可以显示当前月的下一个月的日历；单击previousMonth按钮，可以显示当前月的上一个月的日历。窗口的南面添加一个Panel容器pSouth，其布局是FlowLayout布局，pSouth中放置一个标签用来显示一些信息。运行结果如图所示。
【实验代码】package Calendar;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
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;
import javax.swing.border.Border;
import javax.swing.border.EtchedBorder;
public class Calendarshowing {
static Calendar c = Calendar.getInstance();
static int year = c.get(Calendar.YEAR), month = c.get(Calendar.MONTH)+1,monthday = 0;
static String[] weekdaystr = { "日", "一", "二", "三", "四", "五", "六" };
JFrame frame = new JFrame("日历表");
// JPanel panel = new JPanel();
static JLabel[]dayLabel = new JLabel[49];
static JPanel showPanel;
JButton Prebutton = new JButton("上一月");
JButton Nextbutton = new JButton("下一月");
JLabel showLabel = new JLabel();
static Border Border01 = BorderFactory.createLineBorder(Color.BLUE, 1);
public Calendarshowing() {
//frame.setResizable(false);
showPanel = new JPanel();
frame.setBounds(450, 200, 500, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container content = frame.getContentPane();
final JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new FlowLayout());
Prebutton.addActionListener(new PressButton());
Nextbutton.addActionListener(new PressButton());
buttonPanel.add(Prebutton);
buttonPanel.add(Nextbutton);
content.add(buttonPanel, BorderLayout.NORTH);
final GridLayout gridLayout = new GridLayout(0, 7);
gridLayout.setHgap(10);
gridLayout.setVgap(10);
showPanel.setLayout(gridLayout);
showLabel.setHorizontalAlignment(JLabel.CENTER);
showLabel.setText("<html><Font size = '6',color = 'RED'>"+"日历: "+"<html><Font size='4',color='Green'>"+year+"年"+month+"月"+"</Font></html>");
showLabel.setToolTipText("今天是公元"+c.get(Calendar.YEAR)+"年"+(c.get(Calendar.MONTH)+1)+"月"+c.get(Calendar.DATE)+"日");
content.add(showLabel,BorderLayout.SOUTH);
content.add(showPanel, BorderLayout.CENTER);
frame.setVisible(true);
}
public class PressButton implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
JButton button = (JButton)e.getSource();
if (button == Prebutton)
{
month--;
if (month <= 0){
year--;
month+=12;
}
}
else{
month++;
if (month > 12){
year++;
month-=12;
}
}
showPanel.removeAll();
showPanel.updateUI();
new showing();
showLabel.setHorizontalAlignment(JLabel.CENTER);
showLabel.setText("<html><Font size = '6',color = 'RED'>"+"日历: "+"<html><Font size='4',color='Green'>"+year+"年"+month+"月"+"</Font></html>");
showLabel.setToolTipText("今天是公元"+c.get(Calendar.YEAR)+"年"+(c.get(Calendar.MONTH)+1)+"月"+c.get(Calendar.DATE)+"日");
}
}
static class showing{
public boolean isLeapYear(int year1) // 判断是否是闰年
{
return ((year1 % 4 == 0 && year1 % 100 != 0) || (year1 % 400 == 0));
}
public int firstDay() // 计算该年第一天是星期几
{
long n = year * 365;
for (int i = 1; i < year; i++){
if (isLeapYear(i)){
n++;
}
}
return (int)n%7;
}
public void printWeek() // 设置表头
{
for (int i = 0; i < 7; i++) {
dayLabel[i] = new JLabel(weekdaystr[i],JLabel.CENTER);
dayLabel[i].setBackground(Color.BLACK);
dayLabel[i].setForeground(Color.RED);
showPanel.add(dayLabel[i]);
}
}
public int getMonthDay(int m) // 获取每个月的天数
{
switch (m) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
return 31;
case 4:
case 6:
case 9:
case 11:
return 30;
case 2:
if (isLeapYear(year))
return 29;
else
return 28;
default:
return 0;
}
}
public int getDays(){
monthday = 0;
for (int i = 1;i<month;i++)
monthday+=getMonthDay(i);
return (firstDay()+(monthday%7))%7;
}
public showing(){
int n =1 ;
printWeek();
int k = getDays();
int Year = c.get(Calendar.YEAR);
int Month = c.get(Calendar.MONTH);
Month += 1;
int Date = c.get(Calendar.DATE);
for (int j = 7;n<=getMonthDay(month);j++){
if (j < k+7){
dayLabel[j] = new JLabel();
showPanel.add(dayLabel[j]);
}
else{
dayLabel[j] = new JLabel(""+n,JLabel.CENTER);
dayLabel[j].setToolTipText("星期"+weekdaystr[(j)%7]);
if (Year == year&&Month==month&&Date == n){
dayLabel[j].setText("<html><Font size = '6',color = 'BLUE'>"+n+"</Font></html>");
dayLabel[(Date-1)%7].setForeground(Color.BLUE);
}
showPanel.add(dayLabel[j]);
n++;
}
}
showPanel.setBorder(Border01);
}
}
public static void main(String[] args) {
Calendarshowing c = new Calendarshowing();
showing s = new Calendarshowing.showing();
}
}
【实验效果】
图3.显示当前月份的日历和当前日期
图4.显示每个日期的星期数