java - 从用户输入java覆盖变量

Question

我是Java的新手，为了建立一些技能，我想写一个简单的猜数字游戏。不幸的是，我无法弄清楚如何更新存储用户输入的整数。知道我如何“覆盖”我的int b吗？

import java.util.Scanner;

public class ratespiel {
    public static void main(String[] args) {

        int a = 30;
        Scanner scan = new Scanner(System.in);

        System.out.println("The number you're looking for is between 0-100. Take a guess!");
        int b = scan.nextInt();

        while (a != b) {
            if (a < b) {
                System.out.println("too high!");
                int b = scan.nextInt();
            } else if (a > b) {
                System.out.println("too low!");
                int b = scan.nextInt();
            }
        }
        if (a == b){
            System.out.print("Congratulations, you guessed the right number!");
        }

    }
}

Answer 1

b在循环中不会被覆盖，因为您要重新声明它。

使用int b = ...将创建一个名为b的全新变量。

您需要删除int才能使其正常工作。

import java.util.Scanner;

public class ratespiel {
    public static void main(String[] args) {

        int a = 30;
        Scanner scan = new Scanner(System.in);

        System.out.println("The number you're looking for is between 0-100. Take a guess!");
        int b = scan.nextInt();

        while (a != b) {
            if (a < b) {
                System.out.println("too high!");
                b = scan.nextInt();
            } else if (a > b) {
                System.out.println("too low!");
                b = scan.nextInt();
            }
        }
        if (a == b){
            System.out.print("Congratulations, you guessed the right number!");
        }

    }
}