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如何用java打印日历

2026-03-18 15:22:07Java

如何用java打印日历

打印日历的Java实现方法

打印日历可以通过Java的Calendar类或LocalDate类实现。以下是两种不同的实现方式：

如何用java打印日历

使用`Calendar`类

import java.util.Calendar;

public class PrintCalendar {
    public static void main(String[] args) {
        Calendar calendar = Calendar.getInstance();
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH);

        printCalendar(year, month);
    }

    public static void printCalendar(int year, int month) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(year, month, 1);

        int startDay = calendar.get(Calendar.DAY_OF_WEEK);
        int numberOfDays = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);

        System.out.println("Sun Mon Tue Wed Thu Fri Sat");

        for (int i = 1; i < startDay; i++) {
            System.out.print("    ");
        }

        for (int i = 1; i <= numberOfDays; i++) {
            System.out.printf("%3d ", i);
            if ((i + startDay - 1) % 7 == 0) {
                System.out.println();
            }
        }
    }
}

使用`LocalDate`类（Java 8+）

import java.time.LocalDate;
import java.time.format.TextStyle;
import java.util.Locale;

public class PrintCalendar {
    public static void main(String[] args) {
        LocalDate date = LocalDate.now();
        printCalendar(date.getYear(), date.getMonthValue());
    }

    public static void printCalendar(int year, int month) {
        LocalDate date = LocalDate.of(year, month, 1);
        String monthName = date.getMonth().getDisplayName(TextStyle.FULL, Locale.getDefault());

        System.out.println("     " + monthName + " " + year);
        System.out.println("Su Mo Tu We Th Fr Sa");

        int startDay = date.getDayOfWeek().getValue() % 7;
        int lengthOfMonth = date.lengthOfMonth();

        for (int i = 0; i < startDay; i++) {
            System.out.print("   ");
        }

        for (int i = 1; i <= lengthOfMonth; i++) {
            System.out.printf("%2d ", i);
            if ((i + startDay) % 7 == 0) {
                System.out.println();
            }
        }
    }
}

自定义日历打印功能

如果需要更灵活的日历打印功能，可以扩展上述代码：

public static void printCustomCalendar(int year, int month, int startDayOffset) {
    LocalDate date = LocalDate.of(year, month, 1);
    int startDay = (date.getDayOfWeek().getValue() + startDayOffset) % 7;
    int lengthOfMonth = date.lengthOfMonth();

    String[] dayNames = {"Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"};
    for (String day : dayNames) {
        System.out.print(day + " ");
    }
    System.out.println();

    for (int i = 0; i < startDay; i++) {
        System.out.print("   ");
    }

    for (int i = 1; i <= lengthOfMonth; i++) {
        System.out.printf("%2d ", i);
        if ((i + startDay) % 7 == 0) {
            System.out.println();
        }
    }
}