Question

为什么我从控制台变空？

在我的任务的第一个 部分 /初始阶段中，我只是想让电脑告诉我一周的哪一天用户输入的对应整数（0表示星期日，1表示星期一等）。

/*
Write a program that prompts the user to enter an integer for today’s day of 
the week 
(Sunday is 0, Monday is 1, ..., and Saturday is 6). Also prompt the user to 
enter the 
number of days after today for a future day and dis- play the future day of 
the week. 
*/

import java.util.Scanner; //import scanner

public class Program{
    public static void main(String[] args){

    Scanner input = new Scanner(System.in); //create a scanner object

    int dayIntInput = input.nextInt(); //assign next integer input to dayInt

    System.out.println("What is today's corresponding integer (Sunday=0, Monday=1, etc...."); //ask user for integer

    String[] daysOfWeek = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"}; //make array of days of week

    String dayOfWeek = daysOfWeek[dayIntInput];

    System.out.println(dayOfWeek);

    }
}

Answer 1

您在显示消息之前请求输入以告知用户输入内容。因此，当您运行该程序时，看起来像它刚刚停止冷。事实上，它正等着你输入一些东西。

稍微重新排列代码将使程序更加用户友好：

Scanner input = new Scanner(System.in); //create a scanner object // Prompt user first... System.out.println("What is today's corresponding integer (Sunday=0, Monday=1, etc...."); //ask user for integer // ... THEN accept input int dayIntInput = input.nextInt(); //assign next integer input to dayInt

Answer 2

我认为你的意思是将System.out.println放在获得用户输入的行之前（nextInt（）一行）

获取空白控制台输出（System.out.println无效）

2 个答案: