java - 输入不匹配异常

Question

我被指示创建一个代码，该代码获取用户的前 5 个输入(双倍)并计算平均值。我唯一的问题是，如果用户输入数字以外的任何内容，则会创建异常。有人可以展示如何将此异常添加到我的代码中吗？

import java.util.*;

public class Test1
{
   static Scanner userInput = new Scanner(System.in);

public static void main(String[] args)
{
    Scanner numbers = new Scanner(System.in);

    System.out.println("Please enter a number: ");
    double first = numbers.nextInt();

    System.out.println("Please enter a number: ");
    double second = numbers.nextInt();

    System.out.println("Please enter a number: ");
    double third = numbers.nextInt();

    System.out.println("Please enter a number: ");
    double fourth = numbers.nextInt();

    System.out.println("Please enter a number: ");
    double fifth = numbers.nextInt();

    System.out.println("The average is\t" + ((first + second + third + fourth + fifth)/5)+"\t");
   }
}

Answer 1

这将处理用户输入非整数。

它还删除了未使用的静态Scanner userInput。

public class HelloWorld
{
    public static void main(String[] args)
    {
        Scanner numbers = new Scanner(System.in);

        int total =0;
        int numberOfQuestion = 5;

        for (int i = 0; i < numberOfQuestion ; i ++) {
            System.out.println("Please enter a number: ");

            while (!numbers.hasNextInt()) {
                System.out.println("Input was not a number, please enter a number: ");
                numbers.next();
            }

        total = total + numbers.nextInt();

        }

        System.out.println("The average is\t" + (total/numberOfQuestion)+"\t");
    }
}