简单的日历程序：使用Swing有关组件开发一个简单的图形界面的日历程序，要求程序运行显示当前月份的日历，通过组合框选择年月，可显示指定年月的日历

好的，我可以为您提供一个简单的日历程序的代码。代码使用Java Swing组件开发，可以显示当前月份的日历，并且可以通过组合框选择指定的年月。

请注意，这个程序可能不是很完善，但可以作为一个起点来帮助您开始开发自己的日历程序。

下面是代码：

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

public class CalendarProgram extends JFrame implements ActionListener {

    private JComboBox<String> yearComboBox, monthComboBox;
    private JLabel monthLabel;
    private JPanel calendarPanel;
    private int currentYear, currentMonth;

    public CalendarProgram() {
        super("简单日历程序");

        // 获取当前年份和月份
        Calendar c = Calendar.getInstance();
        currentYear = c.get(Calendar.YEAR);
        currentMonth = c.get(Calendar.MONTH) + 1;

        // 创建顶部面板，包含年份和月份选择器
        JPanel topPanel = new JPanel();
        topPanel.setLayout(new FlowLayout());

        yearComboBox = new JComboBox<String>();
        for (int year = currentYear - 50; year <= currentYear + 50; year++) {
            yearComboBox.addItem(String.valueOf(year));
        }
        yearComboBox.setSelectedItem(String.valueOf(currentYear));
        yearComboBox.addActionListener(this);

        monthComboBox = new JComboBox<String>();
        for (int month = 1; month <= 12; month++) {
            monthComboBox.addItem(String.valueOf(month));
        }
        monthComboBox.setSelectedItem(String.valueOf(currentMonth));
        monthComboBox.addActionListener(this);

        monthLabel = new JLabel(getMonthString(currentMonth) + " " + currentYear);

        topPanel.add(yearComboBox);
        topPanel.add(monthComboBox);
        topPanel.add(monthLabel);

        // 创建日历面板
        calendarPanel = new JPanel();
        calendarPanel.setLayout(new GridLayout(7, 7));

        // 显示当前月份的日历
        updateCalendar(currentYear, currentMonth);

        // 将顶部面板和日历面板添加到窗口中
        add(topPanel, BorderLayout.NORTH);
        add(calendarPanel, BorderLayout.CENTER);

        // 设置窗口大小，可见性，关闭操作
        setSize(400, 300);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    // 根据年份和月份更新日历面板
    private void updateCalendar(int year, int month) {
        // 清空日历面板
        calendarPanel.removeAll();

        // 添加星期标签
        JLabel[] weekLabels = { new JLabel("日"), new JLabel("一"), new JLabel("二"), new JLabel("三"), new JLabel("四"), new JLabel("五"), new JLabel("六") };
        for (JLabel label : weekLabels) {
            label.setHorizontalAlignment(JLabel.CENTER);
            calendarPanel.add(label);
        }

        // 获取指定月份的第一天
        Calendar c = Calendar.getInstance();
        c.set(year, month - 1, 1);
        int firstDayOfWeek = c.get(Calendar.DAY_OF_WEEK);

        // 添加空白格子
        for (int i = 1; i < firstDayOfWeek; i++) {
            calendarPanel.add(new JLabel(""));
        }

        // 添加日期格子
        int daysInMonth = c.getActualMaximum(Calendar.DAY_OF_MONTH);
        for (int day = 1; day <= daysInMonth; day++) {
            JLabel label = new JLabel(String.valueOf(day));
            label.setHorizontalAlignment(JLabel.CENTER);
            calendarPanel.add(label);
        }

        // 刷新窗口
        validate();
        repaint();
    }

    // 获取月份字符串
    private String getMonthString(int month) {
        String[] months = { "一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月" };
        return months[month - 1];
    }

    // 处理年份和月份选择器的事件
    public void actionPerformed(ActionEvent e) {
        int year = Integer.parseInt((String) yearComboBox.getSelectedItem());
        int month = Integer.parseInt((String) monthComboBox.getSelectedItem());

        monthLabel.setText(getMonthString(month) + " " + year);
        updateCalendar(year, month);
    }

    public static void main(String[] args) {
        new CalendarProgram();
    }
}

希望这可以帮助您开始开发自己的日历程序！