LocalDate类实现显示当前月的日历

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

public class Demo1 {
	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.print("    ");
		while(date.getMonthValue() == month) {
			System.out.printf("%3d",date.getDayOfMonth());
			if(date.getDayOfMonth() == today) {
				System.out.print("*");				
			}
			else {
				System.out.print(" ");
			}
			date = date.plusDays(1);
			if(date.getDayOfWeek().getValue() == 1)System.out.println();
		}
		if(date.getDayOfWeek().getValue() != 1)System.out.println();
	}
}

API        java.time.LocalDate

 static LocalDate now()

构造一个表示当前日期的对象

static LocalDate of(int year,int month,int day)

构造一个表示给定日期的对象

int getYear()

int getMonthValue()

int getDayOfMonth()

得到当前日期的年月日

DayOfWeek getDayOfWeek

得到当前日期是星期几，作为DayOfWeek类的一个实例返回。调用getValue来得到1~7之间的一个数，表示这是星期几，1表示星期一，7表示星期日。

LocalDate plusDays(int n)

LocalDate minusDays(int n)

生成当前日期之后或之前n天的日期