java - 我正在用java创建一个小程序，它要求用户输入5个整数并将其放入一个数组中

Question

这是我尝试过的代码，我可以将 5 个整数放入数组中，但我的问题是验证该输入并在未验证时给出错误消息。如果我输入 5 个整数并且它们在所需范围内，则它可以工作，当我输入不在所需范围内的数字时，我会收到一条错误消息，这正是我想要的，但如果我输入符号或字母我的程序崩溃。

import java.util.Scanner;

public class QuestionNr1 {

    public static void main(String[] args) {
        //Keyboard Initialization
        Scanner scanner = new Scanner(System.in);

        //Declare an array to hold 5 integers values
        int list[] = new int[5];
        int i = 0;
        int sum = 0;

        System.out.println("Please enter 5 numbers within the range 1 - 20, with 1 being the lowest and 20 being the highest.");
        while (i < 5) {
            //Fill the array with integers from the keyboard (range: 0 to 20).
            int value = scanner.nextInt();
            if (value >= 0 && value <= 20) {
                list[i] = value;
                i++;
            } else {
                System.out.println("Invalid input, please enter a number with the required range of 1 - 20.");
            }
        }
        for (int j = 0; j < list.length; j++) {
            int value = list[j];
        }

        double average = 0;
        for (int i1 = 0; i1 < list.length; i1++) {
            sum = sum + list[i1];
        }
        System.out.print("The sum total of your five entered numbers = " + sum);
    }
}

Answer 1

//Fill the array with integers from the keyboard (range: 0 to 20).
int value = Integer.MIN_VALUE;
if (scanner.hasNextInt()) int value = scanner.nextInt();
else System.out.println("Please make sure the value you entered is an integer.");