Question

我刚刚开始使用Java进行编程，并试图通过用户输入将华氏温度转换为摄氏转换器。以为我有它，但我现在卡住了。我收到以下错误：

Exception in thread "main" java.util.InputMismatchException    
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)

任何帮助都会很棒！

import java.util.*;

class Practicet {
    public static void main(String[] args) {
        float Fahrenheit = 32;
        float Celsius = 0;
        Scanner option = new Scanner(System.in);
        System.out.println("Do You Want to Enter Fahrenheit or Celsius: ");
        int userInput = option.nextInt();
        switch (userInput) {
            case 0:
                System.out.println("Enter temperature in Fahrenheit: ");
                Fahrenheit = option.nextInt();
                Fahrenheit = (float) ((Fahrenheit - 32) / 1.8000);
                System.out.println("Temperature in Celsius = " + Fahrenheit);
                System.out.println("Thank You! ");
                break;
            case 1:
                System.out.println("Enter temperature in Celsius: ");
                Celsius = option.nextFloat();
                Celsius = (float) ((Celsius * 1.8000) + 32);
                System.out.println("Temperature in Fahrenheit = " + Celsius);
                System.out.println("Thank You! ");
                break;
            default:
                System.out.println("Something went wrong! ");
                break;
        }
    }
}

Answer 1

问题出在你的switch语句中。收到InputMismatchException的唯一方法是输入意外值。尝试将int userInput = option.nextInt();更改为String userInput = option.next();，并将您的案例从0和1更改为"Fahrenheit"和"Celsius"

Scanner.throwfor，next，nextInt错误。无法弄清楚为什么

1 个答案: