如何将布尔值更改为int [保留]

Question

`

public static void main（String [] args）{扫描仪输入=新的Scanner（System.in）;

        boolean isNumber;
        do {
            System.out.println("Welcome to IP Math Quiz");
            System.out.println("***Main Menu***");

            System.out.println("1) Addition");
            System.out.println("2) Subtraction");
            System.out.println("3) Modulus");
            System.out.println("4) Division");
            System.out.println("5) Randon");
            System.out.println("9) Quit");

            if (input.hasNextInt()) {
                isNumber = true;
            } else {
                System.out.println("Error ! Input accept integer only.Input 1-5 or 9 ");
                isNumber = false;
                input.next();
            }
        } while (!(isNumber));

        Scanner scanner = new Scanner(System.in);
        System.out.printf(">");

        System.out.println("Number of Question");

        int corr_num = 0;
        int possible;

        switch (isNumber) {
        case 1:
            int g = scanner.nextInt();
            for (int i = 1; i <= g; i++) {
                int Add_x = (int) (Math.random() * 99); // To random the value of x
                int Add_y = (int) (Math.random() * 99);// To random the value of y

                System.out.println("Q" + i + ":" + " " + Add_x + " " + " + " + " " + Add_y + " " + "=");

                int Add_user_input = scanner.nextInt();
                int check;

                check = (Add_x + Add_y);
                if (Add_user_input == check) {
                    System.out.println("You are correct!");
                    corr_num = corr_num + 1;
                    possible = ((g - corr_num) / corr_num) * 100;
                    System.out.println("The right possible is " + possible + " % ");
                } else {
                    System.out.println(" Sorry, the right answer is : " + check);
                }
            }
            break;
        }
    }
}
       `

用户输入的数字分别是数字或字符，如果用户输入的是数字，则输入用户名。

Answer 1

我假设您正在尝试根据用户输入使用switch语句。因此，将有2个以上的案例（可能是9个）。 （如果您还不知道bool只能容纳两种情况下的true或false，并且如果将其转换为int，则它将为0或类似的值）将boolean转换为int不适合这种情况。因此，您不应该尝试将bool转换为int。而是执行以下操作。在switch语句中添加input.nextInt()。

package com.company;

import java.util.Scanner;

public class demo7 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        boolean isNumber;
        do {
            System.out.println("Welcome to IP Math Quiz");
            System.out.println("***Main Menu***");

            System.out.println("1) Addition");
            System.out.println("2) Subtraction");
            System.out.println("3) Modulus");
            System.out.println("4) Division");
            System.out.println("5) Randon");
            System.out.println("9) Quit");

            if (input.hasNextInt()) {
                isNumber = true;
            } else {
                System.out.println("Error ! Input accept integer only.Input 1-5 or 9 ");
                isNumber = false;
                input.next();
            }
        } while (!(isNumber));

        Scanner scanner = new Scanner(System.in);
        System.out.printf(">");

        System.out.println("Number of Question");

        int corr_num = 0;
        int possible;

        switch (input.nextInt()) {
            case 1:
                int g = scanner.nextInt();
                for (int i = 1; i <= g; i++) {
                    int Add_x = (int) (Math.random() * 99); // To random the value of x
                    int Add_y = (int) (Math.random() * 99);// To random the value of y

                    System.out.println("Q" + i + ":" + " " + Add_x + " " + " + " + " " + Add_y + " " + "=");

                    int Add_user_input = scanner.nextInt();
                    int check;

                    check = (Add_x + Add_y);
                    if (Add_user_input == check) {
                        System.out.println("You are correct!");
                        corr_num = corr_num + 1;
                        possible = ((g - corr_num) / corr_num) * 100;
                        System.out.println("The right possible is " + possible + " % ");
                    } else {
                        System.out.println(" Sorry, the right answer is : " + check);
                    }
                }
                break;
        }
    }
}

如果确实需要将bool转换为int，则您可以做的最好的（imo）与以下类似

switch (isNumber?0:1)