package Lessons;

import java.util.Scanner;

public class Math {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        System.out.print("please enter the first number of your question! ");
        int a1 = s.nextInt();
        System.out.print("So you chose " + a1);
        System.out.println(" Choose ur second number");
        int a2 = s.nextInt();
        System.out.print("You chose " + a2 + " for your second number");
        System.out.print(" Now enter ur operator ");
        String b1 = s.nextLine();
        if (b1.equalsIgnoreCase("-")) {
            System.out.println("You chose " + b1 + "as ur operator");
        }
    }

}

我不明白为什么第15行不做任何输入，将不胜感激：3

输出量

请输入您的问题的第一个数字！2552所以您选择了2552选择您的第二个数字41您选择了第二个数字41现在输入ur运算符

由于某种原因，输出在最后一行结束并停止，并且不接收任何信息！