如何循环，请求用户输入这个Java程序？

Question

在这个程序中，一旦捕捉到异常，程序就会显示捕捉消息，程序会自动成功终止（如果想询问用户输入，我需要再次手动运行程序）。我不希望程序完成，但它会自动要求用户输入一个有效的数字，并从一开始就执行功能，如何为此编写

import java.util.InputMismatchException;
import java.util.Scanner;

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

        try {
            System.out.println("Enter a Whole Number to divide: ");
            int x = sc.nextInt();

            System.out.println("Enter a Whole number to divide by: ");
            int y = sc.nextInt();

            int z = x / y;

            System.out.println("Result is: " + z);
        }
        catch (Exception e) {
            System.out.println("Input a valid number");
        }

        finally{
            sc.close();
        }
    }
}

输出

Enter a Whole Number to divide: 
5
Enter a Whole number to divide by: 
a
Input a valid number

Process finished with exit code 0

Answer 1

有一些关于nextInt的问题需要注意，您可以查看以下链接：Scanner is skipping nextLine() after using next() or nextFoo()?

对于您的程序，使用while循环，您需要知道Y可能是0，这将导致ArithmeticException

        while (true) {
            try {
                System.out.println("Enter a Whole Number to divide: ");
                // use nextLine instead of nextInt
                int x = Integer.parseInt(sc.nextLine());
                System.out.println("Enter a Whole number to divide by: ");
                int y = Integer.parseInt(sc.nextLine());
                if (y == 0) {
                    System.out.println("divisor can not be 0");
                    continue;
                }
                double z = ((double) x) / y
                System.out.println("Result is: " + z);
                break;
            }
            catch (Exception e) {
                System.out.println("Input a valid number");
            }
        }
        sc.close();