JAVA获取一个月有多少天,以及判断当前天为周几

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.GregorianCalendar;

/***

*

* @author zhanchaohan

*

*/

public class Calender {

static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

private static void getMonthLastDay(Date date) throws ParseException {

GregorianCalendar cal = new GregorianCalendar();

cal.setTime(date);

System.out.println(cal.getActualMaximum(Calendar.DAY_OF_MONTH));

}

private static void getDayOfWeek(Date date) {

GregorianCalendar cal = new GregorianCalendar();

cal.setTime(date);

int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);

char[] weekChar = new char[] { '日', '一', '二', '三', '四', '五', '六' };

System.out.println(weekChar[dayOfWeek - 1]);

}

public static void main(String[] args) throws ParseException {

// getMonthLastDay(sdf.parse("2021-6-1 00:00:00"));

// getMonthLastDay(sdf.parse("2021-7-1 00:00:00"));

// getMonthLastDay(sdf.parse("2021-8-1 00:00:00"));

// getMonthLastDay(sdf.parse("2021-9-1 00:00:00"));

getDayOfWeek(sdf.parse("2021-2-1 00:00:00"));

getDayOfWeek(sdf.parse("2021-2-2 00:00:00"));

getDayOfWeek(sdf.parse("2021-2-3 00:00:00"));

getDayOfWeek(sdf.parse("2021-2-4 00:00:00"));

getDayOfWeek(sdf.parse("2021-2-5 00:00:00"));

getDayOfWeek(sdf.parse("2021-2-6 00:00:00"));

getDayOfWeek(sdf.parse("2021-2-7 00:00:00"));

}

}

posted @

2021-07-01 09:57

Jachs

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