import java.util.Calendar;
public class CalendarBean {
? ? String day[];
? ? int year = 2013, month = 0;
? ? public void setYear(int year) {
? ? ? ? this.year = year;
? ? }
? ? public int getYear() {
? ? ? ? return year;
? ? }
? ? public void setMonth(int month) {
? ? ? ? this.month = month;
? ? }
? ? public int getMonth() {
? ? ? ? return month;
? ? }
? ? //返回某年某月1號(hào)開(kāi)始的日期數(shù)組
? ? public String[] getDays() {
? ? ? ? String a[] = new String[42];
? ? ? ? Calendar 日歷 = Calendar.getInstance();
? ? ? ? //注意：1月份是從0開(kāi)始，所以要減1
? ? ? ? 日歷.set(year, month - 1, 1);
? ? ? ? int 星期幾 = 日歷.get(Calendar.DAY_OF_WEEK) - 1;
? ? ? ? int day = 0;
? ? ? ? if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
? ? ? ? ? ? day = 31;
? ? ? ? }
? ? ? ? if (month == 4 || month == 6 || month == 9 || month == 11) {
? ? ? ? ? ? day = 30;
? ? ? ? }
? ? ? ? if (month == 2) {
? ? ? ? ? ? if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) {
? ? ? ? ? ? ? ? day = 29;
? ? ? ? ? ? } else {
? ? ? ? ? ? ? ? day = 28;
? ? ? ? ? ? }
? ? ? ? }
? ? ? ? for (int i = 星期幾, n = 1; i < 星期幾 + day; i++) {
? ? ? ? ? ? a[i] = String.valueOf(n);
? ? ? ? ? ? n++;
? ? ? ? }
? ? ? ? return a;
? ? }
}

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class CalendarFrame extends JFrame{
?? ?JLabel labelDay[] = new JLabel[42];
?? ?JLabel labelYear;
?? ?JButton titleName[] = new JButton[7];
?? ?JButton nextMonth, previousMonth;
?? ?JLabel showMessage;
?? ?JTextField inputYear;
?? ?CalendarBean calendar;
?? ?String name[] = { "日", "一", "二", "三", "四", "五", "六" };
?? ?int year = 2013, month = 1;
?? ?String days[];

?? ?public CalendarFrame() {
?? ??? ?super("日歷應(yīng)用程序");
?? ??? ?calendar = new CalendarBean();
?? ??? ?calendar.setYear(year);
?? ??? ?calendar.setMonth(month);
?? ??? ?days = calendar.getDays();
?? ??? ?// 窗口添加scrollPane在中心區(qū)
?? ??? ?add(getCenterPanel(),BorderLayout.CENTER);
?? ??? ?// 窗口添加pNorth 在北面區(qū)域
?? ??? ?add(getNorthPanel(),BorderLayout.NORTH);
?? ??? ?// 窗口添加pSouth 在南區(qū)域。
?? ??? ?add(getSouthPanel(),BorderLayout.SOUTH);
?? ?}
?? ?private JPanel getNorthPanel() {
?? ??? ?JPanel panel = new JPanel();
?? ??? ?labelYear = new JLabel("請(qǐng)輸入年份：");
?? ??? ?inputYear = new JTextField(10);
?? ??? ?previousMonth = new JButton("上月");
?? ??? ?nextMonth = new JButton("下月");
?? ??? ?/**
?? ??? ? * 添加時(shí)間監(jiān)聽(tīng)
?? ??? ? */
?? ??? ?inputYear.addActionListener(new ActionListener() {
?? ??? ??? ?@Override
?? ??? ??? ?public void actionPerformed(ActionEvent e) {
?? ??? ??? ??? ?try{
?? ??? ??? ??? ??? ?year = Integer.parseInt(inputYear.getText());
?? ??? ??? ??? ?}catch (NumberFormatException el){
?? ??? ??? ??? ??? ?JOptionPane.showMessageDialog(null,"請(qǐng)輸入正確年份！");
?? ??? ??? ??? ?}
?? ??? ??? ??? ?calendar.setYear(year);
?? ??? ??? ??? ?UpdateUI();
?? ??? ??? ?}
?? ??? ?});
?? ??? ?previousMonth.addActionListener(new ActionListener() {//上個(gè)月
?? ??? ??? ?@Override
?? ??? ??? ?public void actionPerformed(ActionEvent e) {
?? ??? ??? ??? ?month--;//獲取上個(gè)月的時(shí)間
?? ??? ??? ??? ?//System.out.println("Hello World");
?? ??? ??? ??? ?if(month<=0){//跳到上一年
?? ??? ??? ??? ??? ?year--;
?? ??? ??? ??? ??? ?month = 12;
?? ??? ??? ??? ?}
?? ??? ??? ??? ?UpdateUI();;
?? ??? ??? ?}
?? ??? ?});
?? ??? ?nextMonth.addActionListener(new ActionListener() {//下個(gè)月
?? ??? ??? ?@Override
?? ??? ??? ?public void actionPerformed(ActionEvent e) {
?? ??? ??? ??? ?month++;
?? ??? ??? ??? ?if(month>12){//到達(dá)下一年
?? ??? ??? ??? ??? ?year++;
?? ??? ??? ??? ??? ?month=1;
?? ??? ??? ??? ?}
?? ??? ??? ??? ?UpdateUI();;
?? ??? ??? ?}
?? ??? ?});
?? ??? ?panel.add(labelYear,new FlowLayout());
?? ??? ?panel.add(inputYear,new FlowLayout());
?? ??? ?panel.add(previousMonth,new FlowLayout());
?? ??? ?panel.add(nextMonth,new FlowLayout());
?? ??? ?return panel;
?? ?}
?? ?private JPanel getCenterPanel() {
?? ??? ?JPanel panel = new JPanel();
?? ??? ?// 將panel的布局設(shè)置為7行7列的GridLayout布局
?? ??? ?panel.setLayout(new GridLayout(7,7));
?? ??? ?for (int i = 0; i < 7; i++) {
?? ??? ??? ?titleName[i] = new JButton(name[i]);
?? ??? ??? ?// panel添加組件titleName[i]
?? ??? ??? ?panel.add(titleName[i]);
?? ??? ?}
?? ??? ?for (int i = 0; i < 42; i++) {
?? ??? ??? ?labelDay[i] = new JLabel(days[i], JLabel.CENTER);
?? ??? ??? ?// panel添加組件labelDay[i]
?? ??? ??? ?panel.add(labelDay[i]);
?? ??? ?}
?? ??? ?return panel;
?? ?}
?? ?private JPanel getSouthPanel() {
?? ??? ?JPanel panel = new JPanel();
?? ??? ?showMessage = new JLabel("日歷: " + year + "年" + month + "月");
?? ??? ?panel.add(showMessage);
?? ??? ?return panel;
?? ?}

?? ?//添加的方法
?? ?private void UpdateUI(){
?? ??? ?calendar.setYear(year);
?? ??? ?calendar.setMonth(month);
?? ??? ?days = calendar.getDays();
?? ??? ?for (int i = 0; i < 42; i++) {
?? ??? ??? ?labelDay[i].setText(days[i]);
?? ??? ?}
?? ??? ?showMessage.setText("日歷："+calendar.getYear()+"年"+calendar.getMonth()+"月");
?? ?}
}

import javax.swing.*;
public class CalendarMainClass {
?? ?public static void main(String args[]) {
?? ??? ?CalendarFrame frame = new CalendarFrame();
?? ??? ?frame.setBounds(100, 100, 360, 320);
?? ??? ?frame.setVisible(true);?
?? ??? ?frame.validate();
?? ??? ?frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
?? ?}
}