尝试使用String变量重新启动do-while循环以等于“yes”或“不” [英] Trying to restart a do-while loop with a String variable to equal "yes" or "no"

问题描述

非常简单的程序计算行程距离（刚开始一周前），我有这个循环工作的真假问题，但我希望它适用于简单的是或否。我为此分配的字符串是答案。

Very simple program calculating travel distance(just started a week ago) and I have this loop working for a true or false question, but I want it to work for a simple "yes" or "no" instead. The String I have assigned for this is answer.

public class Main {

public static void main(String[] args) {

    Scanner input = new Scanner(System.in);

    double distance;
    double speed;
    boolean again = true;
    String answer;

    do{
        System.out.print("Tell me your distance in miles: ");
        distance = input.nextDouble();
        System.out.print("Tell me your speed in which you will travel: ");
        speed = input.nextDouble();

        double average = distance / speed;

        System.out.print("Your estimated time to your destination will be: " + average + " hours\n\n");

        if(average < 1){
            average = average * 10;
            System.out.println(" or " + average + " hours\n\n");
        }

        System.out.println("Another? ");
        again = input.nextBoolean();       

    }while(again);

}

}

推荐答案

你需要使用 input.next（）而不是 input.nextBoolean（），并将结果与​​字符串文字是进行比较（可能是以不区分大小写的方式）。请注意，再次声明 需要从布尔更改为 String 。

You need to use input.next() instead of input.nextBoolean(), and compare the result to a string literal "yes" (presumably, in a case-insensitive way). Note that the declaration of again needs to change from boolean to String.

String again = null;
do {
    ... // Your loop
    again = input.nextLine(); // This consumes the \n at the end
} while ("yes".equalsIgnoreCase(again));

这篇关于尝试使用String变量重新启动do-while循环以等于“yes”或“不”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！