java - Java 中的星期几

Question

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Answer 1

老式(相当老..)

import java.util.*;

public class GetDay {
    public static void main(String[] args) {
        Calendar calendar = new GregorianCalendar();
        calendar.set(2011, 1, 9); // 1 = Feb  months are zero based remember
        System.out.println(calendar.get(Calendar.DAY_OF_WEEK));  
    }
}

在java-8中它可以像

一样简单

LocalDate.now().getDayOfWeek //get day of week for current day
LocalDate.of(2016, 01, 01).getDayOfWeek //get day of week for a particular day

此调用返回 DayOfWeek枚举值本身有一些不错的功能。