编辑代码

import java.util.*;
import java.time.*;
class Main {
	public static void main(String[] args) {
        LocalDateTime t = LocalDateTime.now();
        //DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy/mm/dd");
        //DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd");

        //System.out.println(dtf.format(t));
        LocalDate d = LocalDate.now();
        System.out.println(d);
        System.out.println(d.getYear());
        System.out.println(d.getMonthValue());
        System.out.println(d.getDayOfMonth());
        LocalDate n = d.plusDays(1-d.getDayOfMonth());
        System.out.println(n.getDayOfWeek()); 
        System.out.println(n.getDayOfWeek().getValue());
        System.out.println(n.lengthOfMonth()); 
        System.out.println(n.getDayOfMonth());


       
	}
}