方法下面检索七天，并返回短名称的天在列表数组在Kotlin，你可以重新格式化然后在Java格式，只是提出想法日历可以返回短名称

private fun getDayDisplayName():List<String>{
        val calendar = Calendar.getInstance()
        val dates= mutableListOf<String>()
        dates.clear()
        val s=   calendar.getDisplayName(DAY_OF_WEEK, SHORT, Locale.US)
        dates.add(s)
        for(i in 0..5){
            calendar.roll( Calendar.DATE, -1)
            dates.add(calendar.getDisplayName(DAY_OF_WEEK, SHORT, Locale.US))
        }
        return dates.toList()
    }

结果是这样的

I/System.out: Wed
    Tue
    Mon
    Sun
I/System.out: Sat
    Fri
    Thu

private String getDay(Date date){

    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("EEEE");
    //System.out.println("DAY "+simpleDateFormat.format(date).toUpperCase());                       
    return simpleDateFormat.format(date).toUpperCase();
}

private String getDay(String dateStr){
    //dateStr must be in DD-MM-YYYY Formate
    Date date = null;
    String day=null;

    try {
        date = new SimpleDateFormat("DD-MM-YYYY").parse(dateStr);

        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("EEEE");
        //System.out.println("DAY "+simpleDateFormat.format(date).toUpperCase());
        day = simpleDateFormat.format(date).toUpperCase();


    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }


    return day;
}

一句话回答:

return LocalDate.parse("06/02/2018",DateTimeFormatter.ofPattern("dd/MM/yyyy")).getDayOfWeek().name();

使用的例子:

public static String getDayOfWeek(String date){
  return LocalDate.parse(date, DateTimeFormatter.ofPattern("dd/MM/yyyy")).getDayOfWeek().name();
}

public static void callerMethod(){
   System.out.println(getDayOfWeek("06/02/2018")); //TUESDAY
}

import java.time.*;

public static String findDay(int month, int day, int year) {
    LocalDate localDate = LocalDate.of(year, month, day);
    DayOfWeek dayOfWeek = localDate.getDayOfWeek();
    return dayOfWeek.name();
}

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();

  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。