【Java】LocalDate类编写一个日历程序

import java.time.*;

public class CalendarTest {
    public static void main(String[] args) {
        LocalDate date = LocalDate.now();
        int month = date.getMonthValue();
        int today = date.getDayOfMonth();
        
        date = date.minusDays(today-1);
        DayOfWeek weekday = date.getDayOfWeek();
        int value = weekday.getValue();
        
        System.out.println("Mon Tue Wed Thu Fri Sat Sun");
        for(int i = 1;i< value;i++)
            System.out.println("    ");
        while(date.getMonthValue() == month)
        {
            System.out.printf("%3d",date.getDayOfMonth());
            if(date.getDayOfMonth()==today)
                System.out.printf("*");
            else
                System.out.printf(" ");
            date = date.plusDays(1);
            if(date.getDayOfWeek().getValue() == 1) System.out.println();
        }
        if(date.getDayOfWeek().getValue() !=1 ) System.out.println();
    }
}

 

利用LocalDate类编写一个日历程序，可处理星期几以及各月天数不同等问题

我们不需要了解LocalDate类如何计算类，只需要使用这个类的借口就可以了。