大二生的JAVA题求解，帮帮我吧😭

import java.util.Scanner;

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

        int correctCount = 0; // 用户答对的题目数量
        int wrongCount = 0; // 用户答错的题目数量

        for (int i = 1; i <= 10; i++) {  // 这里假设用户需要回答 10 道题目
            // 生成两个两位数和一个运算符
            int num1 = (int) (Math.random() * 90 + 10);
            int num2 = (int) (Math.random() * 90 + 10);
            char operator = generateOperator();

            // 输出表达式并接收用户答案
            System.out.print("问题 " + i + ": ");
            System.out.print(num1 + " " + operator + " " + num2 + " = ");
            int answer = scanner.nextInt();

            // 检查用户答案是否正确
            int result;
            if (operator == '+') {
                result = num1 + num2;
            } else if (operator == '-') {
                result = num1 - num2;
            } else {
                result = num1 * num2;
            }

            // 判断用户答案是否正确并更新答对和答错的次数
            if (answer == result) {
                System.out.println("回答正确！");
                correctCount++;
            } else {
                System.out.println("回答错误！正确答案是 " + result + ".");
                wrongCount++;
            }
        }

        // 输出统计结果和评分
        System.out.println("答对了 " + correctCount + " 题.");
        System.out.println("答错了 " + wrongCount + " 题.");

        double score = (double) correctCount / (correctCount + wrongCount) * 100;
        System.out.println("得分： " + score + "%");

        scanner.close();
    }

    // 用于生成随机运算符的方法
    public static char generateOperator() {
        int operatorCode = (int) (Math.random() * 3);
        if (operatorCode == 0) {
            return '+';
        } else if (operatorCode == 1) {
            return '-';
        } else {
            return '*';
        }
    }
}