Java调整当前年度和指定月份的星期一

/**

 * Display all of the Mondays in the current year and the specified month.

 */// 来 自 n o w j a   v  a . c o m - 时  代  Java

import java.time.Month;

import java.time.Year;

import java.time.DayOfWeek;

import java.time.LocalDate;

import java.time.DateTimeException;


import java.time.temporal.TemporalAdjuster;

import java.time.temporal.TemporalAdjusters;


import java.io.PrintStream;

import java.lang.NumberFormatException;

/*
nowjava 提供
*/

public class ListMondays {

    public static void main(String[] args) {

        Month month = null;


        if (args.length < 1) {

            System.out.printf("Usage: ListMondays <month>%n");

            throw new IllegalArgumentException();

        }


        try {

            month = Month.valueOf(args[0].toUpperCase());

        } catch (IllegalArgumentException exc) {

            System.out.printf("%s is not a valid month.%n", args[0]);

            throw exc; // Rethrow the exception.

        }


        System.out.printf("For the month of %s:%n", month);

        LocalDate date = Year.now().atMonth(month).atDay(1)

                .with(TemporalAdjusters.firstInMonth(DayOfWeek.MONDAY));

        Month mi = date.getMonth();

        while (mi == month) {

            System.out.printf("%s%n", date);

            date = date.with(TemporalAdjusters.next(DayOfWeek.MONDAY));

            mi = date.getMonth();

        }

    }

}