java如何编译输入某年某月某日输出星期几？

Answer 1

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Scanner;
public class Test1 {
public static void main(String[] agrs){
Scanner scan = new Scanner(System.in);
System.out.println("请输入一个日期，格式为yyyy-MM-dd(如：2017-12-12)");
String d = scan.nextLine();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date date = null;
try {
date = sdf.parse(d);
System.out.println(getWeekOfDate(date));
} catch (ParseException e) {
System.out.println("日期格式不正确！");
}
}
public static String getWeekOfDate(Date dt) {
String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
Calendar cal = Calendar.getInstance();
cal.setTime(dt);
int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
if (w < 0)
w = 0;
return weekDays[w];
}
}
测试没问题