java - 如何编写一个 Java 类，将用户输入的数字数据解释为星期几

Question

我是 Java 新手，正在学习它。我遇到了这个问题，我想理解它。

如何编写一个具有 2 个字段的 Java 类，其中包含以下信息:

• 房间号(字符串)
• MeetDays(字符串)

MeetDays 将星期日视为第一天。用户应输入类(class)每天聚会的天数。

示例: 如果周二和周四上课，用户将输入 35。如果用户输入无效的数字范围，例如“11”或“233”等，则会抛出异常。

我想在这里做一个 switch 语句，但我只是不确定如何继续。我认为对于经验丰富的 Java 开发人员来说这可能是一个简单的问题。任何帮助或协助将不胜感激。

编辑:

public class SectionNumber {

    private String roomNumber;
    private String meetDays;

    public SectionNumber() {}

    public SectionNumber(String roomNumber, String meetDays) {
        this.roomNumber = roomNumber;
        this.meetDays = meetDays;
    }

    public String getRoomNumber() {
        return roomNumber;
    }

    public void setRoomNumber(String roomNumber) {
        this.roomNumber = roomNumber;
    }

    public String getMeetDays() {
        return meetDays;
    }

    public void setMeetDays(String meetDays) {
        this.meetDays = meetDays;
    }


    // not sure how to proceed here
    public void classMeetDays(String userInput) {

        switch (meetDays) {
        case userInput:

            break;

        default:
            break;
        }
    }
}

Answer 1

import java.util.ArrayList;
import java.util.List;

public class Main {

    public static void main(String[] args) {

        List<String> dayList = new ArrayList<String>();

        int userInputNumber = 1234567;

        String userInputAsString = String.valueOf(userInputNumber);


        for (int i = 0; i < userInputAsString.length(); i++) {
            char dayAsNumericChar = userInputAsString.charAt(i);

            String day;
            switch (dayAsNumericChar) {
            case '1':
                day = "Sunday";
                break;
            case '2':
                day = "Monday";
                break;
            case '3':
                day = "Tuesday";
                break;
            case '4':
                day = "Wednesday";
                break;
            case '5':
                day = "Thursday";
                break;
            case '6':
                day = "Friday";
                break;
            case '7':
                day = "Saturday";
                break;
            default:
                throw new RuntimeException("Invalide number: " + dayAsNumericChar);
            }
            if (dayList.contains(day)) {
                throw new RuntimeException("Day: " + day + " is picked twice");
            }
            dayList.add(day);


        }
        System.out.println(userInputAsString);
        for (String s : dayList) {
            System.out.println(" -> " + s);
        }
    }

}