我的java计算器需要帮助吗

我最近开始学习java，我试图编写一个计算器，但它给了我错误（我不明白为什么会发生这种情况）

PS：对不起，我的英语不好

package pkg2;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        System.out.println("Write a number: ");
        int first = reader.nextInt();
        System.out.println("Write another number: ");
        int second = reader.nextInt();
        System.out.println("Write an operator: ");
        char operator = reader.nextInt();
        if(operator == '+') {
            System.out.println(first + second);
        }
        else if(operator == '-') {
            System.out.println(first - second);
        }
        else if(operator == '*') {
            System.out.println(first * second);
        }
        else if(operator == '/') {
            System.out.println(first / second);
        }
    }
}

错误是：

---

提示输入运算符时，您试图读取的是int，而不是char。以下是您应该如何做到这一点：

package pkg2;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        System.out.println("Write a number: ");
        int first = reader.nextInt();
        System.out.println("Write another number: ");
        int second = reader.nextInt();
        System.out.println("Write an operator: ");
        char operator = reader.next().charAt(0);
        if(operator == '+') {
            System.out.println(first + second);
        }
        else if(operator == '-') {
            System.out.println(first - second);
        }
        else if(operator == '*') {
            System.out.println(first * second);
        }
        else if(operator == '/') {
            System.out.println(first / second);
        }
    }
}

---

提示输入运算符时，您试图读取的是int，而不是char。以下是您应该如何做到这一点：

package pkg2;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        System.out.println("Write a number: ");
        int first = reader.nextInt();
        System.out.println("Write another number: ");
        int second = reader.nextInt();
        System.out.println("Write an operator: ");
        char operator = reader.next().charAt(0);
        if(operator == '+') {
            System.out.println(first + second);
        }
        else if(operator == '-') {
            System.out.println(first - second);
        }
        else if(operator == '*') {
            System.out.println(first * second);
        }
        else if(operator == '/') {
            System.out.println(first / second);
        }
    }
}

---

它给出了什么错误？这是你问题中最重要的部分，但没有。请使用reader.next（）.charAt（0）阅读字符抱歉，我已经编辑了postCheck如何获取字符输入它正在工作！谢谢它给出了什么错误？这是你问题中最重要的部分，但没有。请使用reader.next（）.charAt（0）阅读字符抱歉，我已经编辑了postCheck如何获取字符输入它正在工作！谢谢