String inputDate = "01/08/2012";
  SimpleDateFormat format1 = new SimpleDateFormat("dd/MM/yyyy");
  Date dt1 = format1.parse(input_date);
  DateFormat format2 = new SimpleDateFormat("EEEE"); 
  String finalDay = format2.format(dt1);

使用此代码从输入日期中查找日期名称。简单且经过良好测试。

java.time

使用java。在Java 8及以后版本中内置了时间框架。

DayOfWeek枚举可以生成一个字符串，其中包含自动本地化为本地语言和文化规范的日期名称。指定一个TextStyle来指示您想要长形式或缩写名称。

import java.time.LocalDate
import java.time.format.DateTimeFormatter
import java.time.format.TextStyle
import java.util.Locale
import java.time.DayOfWeek;

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("d/M/yyyy");
LocalDate date = LocalDate.parse("23/2/2010", formatter); // LocalDate = 2010-02-23
DayOfWeek dow = date.getDayOfWeek();  // Extracts a `DayOfWeek` enum object.
String output = dow.getDisplayName(TextStyle.SHORT, Locale.US); // String = Tue

  String inputDate = "01/08/2012";
  SimpleDateFormat format1 = new SimpleDateFormat("dd/MM/yyyy");
  Date dt1 = format1.parse(input_date);
  DateFormat format2 = new SimpleDateFormat("EEEE"); 
  String finalDay = format2.format(dt1);

使用此代码从输入日期中查找日期名称。简单且经过良好测试。

通过使用java.util.scanner包给用户输入日期、月和年来查找星期几的程序:

import java.util.Scanner;

public class Calender {
    public static String getDay(String day, String month, String year) {

        int ym, yp, d, ay, a = 0;
        int by = 20;
        int[] y = new int[]{6, 4, 2, 0};
        int[] m = new int []{0, 3, 3, 6, 1, 4, 6, 2, 5, 0, 3, 5};

        String[] wd = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

        int gd = Integer.parseInt(day);
        int gm = Integer.parseInt(month);
        int gy = Integer.parseInt(year);

        ym = gy % 100;
        yp = ym / 4;
        ay = gy / 100;

        while (ay != by) {
            by = by + 1;
            a = a + 1;

            if(a == 4) {
                a = 0;
            }
        }

        if ((ym % 4 == 0) && (gm == 2)) {
            d = (gd + m[gm - 1] + ym + yp + y[a] - 1) % 7;
        } else
            d = (gd + m[gm - 1] + ym + yp + y[a]) % 7;

        return wd[d];
    }

    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);

        String day = in.next();
        String month = in.next();
        String year = in.next();

        System.out.println(getDay(day, month, year));
    }
}

您可以尝试以下代码:

import java.time.*;

public class Test{
   public static void main(String[] args) {
      DayOfWeek dow = LocalDate.of(2010,Month.FEBRUARY,23).getDayOfWeek();
      String s = String.valueOf(dow);
      System.out.println(String.format("%.3s",s));
   }
}

可以使用以下代码片段进行输入，如(day = "08"， month = "05"， year = "2015"，输出将是"WEDNESDAY")

Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DAY_OF_MONTH, Integer.parseInt(day));
calendar.set(Calendar.MONTH, (Integer.parseInt(month)-1));
calendar.set(Calendar.YEAR, Integer.parseInt(year));
String dayOfWeek = calendar.getDisplayName(Calendar.DAY_OF_WEEK, Calendar.LONG, Locale.US).toUpperCase();