accessor method & mutator method

import java.time.*;

public class MyTest{
    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();
    }
}

 date = date.minusDays(today - 1); 更改了 date 所引用的对象