使用Java日历类实现本月的日历

import java.time.DayOfWeek;
import java.time.LocalDate;

/**
 * 使用 LocalDate类实现日历
 *      LocalDate : java8提供日历类
 */

public class CalendarTest {

    public static void main(String[] args) {

        LocalDate date = LocalDate.now();
        int month = date.getMonthValue(); // 获取当前月
        int today = date.getDayOfMonth(); // 获取当前日

        // 设置date为这个月的第一天
        date = date.minusDays(today - 1);
        DayOfWeek dayOfWeek = date.getDayOfWeek();  // 获取本月第一天为星期几
        int value = dayOfWeek.getValue();   // 1代表星期一 ....

        System.out.println("Mon Tue Wed Thu Fri Sat Sun");
        for (int i=1; i<value; i++){
            System.out.print("    ");
        }

        while(date.getMonthValue() == month){
            System.out.printf("%3d",date.getDayOfMonth());
            if(date.getDayOfMonth() == today){
                System.out.printf("*");  // 标记当前日期
            }else {
                System.out.print(" ");
            }

            date = date.plusDays(1);
            if(date.getDayOfWeek().getValue() == 1){
                System.out.println();
            }
        }

    }

}