从给定的字符串输入返回 DayOfTheWeek(作为大写字符串) [英] Return DayOfTheWeek (as an uppercase string) from a given String input

问题描述

这是我第一次查看 Date Api，我不明白我哪里出错了.该问题已被注释掉，因此您可以准确了解预期内容.

This is my first time looking into the Date Api's i don't understand where i'm going wrong. The Question has been commented out so you can see exactly whats expected.

有人可以简单解释一下如何解决/解决这个问题吗?

Could someone please simply explain how to solve/approach this problem?

当我进入 DateUtil 类>DayofTheWeek 方法时，我尝试使用 theDate 字段返回 LocalDate.DayofTheWeek 方法，该字段现在已初始化.但它不会工作.一直提示无法解析方法"?

When i get to the DateUtil class>DayofTheWeek method i attempt to return the LocalDate.DayofTheWeek method using the theDate field which by now has been initialised. but it wont work. It keeps saying 'cannot resolve method'?

public class ChallengeThree {
    public static String dayOfWeek(String date) {
        /**
         *** Returns a String storing the day of the week in all capital letters of the
         * given date String
         * Complete the implementation of the DateUtil class and use it in this function
         * Arguments
         * date - a String storing a local date, such as "2000-01-01"
         * Examples
         * dayOfWeek("2000-01-01") returns "SATURDAY"
         */**

        // ====================================
        // Do not change the code before this

        // CODE1: Write code to return the day of the week of the String date
        //        using the DateUtil class at the bottom of this file

        DateUtil newdates= new DateUtil("2000-01-01");
        System.out.println(newdates.dayOfWeek());
        // ====================================
        // Do not change the code after this
    }

//    public static void main(String[] args) {
//        String theDayOfWeek = dayOfWeek("2000-01-01");
        String expected = "SATURDAY";
        // Expected output is
        // true
//        System.out.println(theDayOfWeek == expected);
//    }
}

class DateUtil {
    LocalDate theDate;

    public DateUtil(String date) {
        /**
         * Initialize the theDate field using the String date argument
         * Arguments
         * date - a String storing a local date, such as "2000-01-01"
         */

        // ====================================
        // Do not change the code before this


        LocalDate theNewDate = LocalDate.parse(date);
        this.theDate=theNewDate;
        // ====================================
        // Do not change the code after this
    }

    public String dayOfWeek() {
        /**
         * Return a String the day of the week represented by theDate
         */

        // ====================================
        // Do not chDate theDate = new ange the code before this

         return LocalDate.of(theDate).getDayOfWeek();
        // ====================================
        // Do not change the code after this
    }
}

推荐答案

你让这件事变得太复杂了.

You are making this much too complicated.

一个问题是你在文本中思考，使用哑字符串而不是智能对象.不要传递字符串 "2000-01-01"，传递一个 LocalDate 对象.不要传递字符串 SATURDAY，传递 DayOfWeek.SATURDAY 对象.

One problem is that you are thinking in text, using dumb strings rather than smart objects. Do not be passing around the string "2000-01-01", pass around a LocalDate object. Do not pass around the string SATURDAY, pass around the DayOfWeek.SATURDAY object.

LocalDate
.parse(
    "2000-01-01"
)
.getDayOfWeek()
.equals(
    DayOfWeek.SATURDAY 
)

如果你违背我的建议坚持使用字符串，你可以得到DayOfWeek 通过调用 toString 将对象作为文本枚举.

If you insist on using strings against my advice, you can get the name of the DayOfWeek enum object as text by calling toString.

String output = DayOfWeek.SATURDAY.toString() ;

往另一个方向走，调用 DayOfWeek.valueOf.

Going the other direction, calling DayOfWeek.valueOf.

DayOfWeek dow = DayOfWeek.valueOf( "SATURDAY" ) ;

这篇关于从给定的字符串输入返回 DayOfTheWeek(作为大写字符串)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！